Terra, Magical Adept
Spark Double

   Prerequisites

What do I need to start this combo?
Terra on the battlefield (Terra on the battlefield as Esper Terra on the battlefield).
Spark Double in hand.
3 available

   Steps

How does this combo work?
1
Cast Spark Double by paying 3, choosing to have it enter the battlefield as a copy of Esper Terra that isn't legendary. This will cause it to enter the battlefield with a lore counter as it will be a Saga.
2
Spark Double's first chapter ability triggers, creating a token copy of Spark Double with haste, which will enter as a copy of Esper Terra with haste that isn't legendary and with one to four lore counters on it.
3
The Spark Double token's chapter abilities will trigger according to how many lore counters were placed on it.
4
Resolve the first Spark Doubler trigger, creating a token copy of Spark Double with haste, which will enter as a copy of Esper Terra with haste that isn't legendary and with one to four lore counters on it.
5
Repeat from step 3.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite colored mana
Infinite sacrifice triggers
Infinite death triggers
Infinite creature tokens with haste
Hei Bai, Forest Guardian
0.1%inclusion4 decks3.35K decks
Top Commanders
Terra, Magical Adept
16%inclusion1.90K decks12.3K decks
Tom Bombadil
0.9%inclusion77 decks8.99K decks
Go-Shintai of Life's Origin
0.1%inclusion5 decks8.80K decks
The Wandering Minstrel
0.0%inclusion4 decks12K decks
Kenrith, the Returned King
0.0%inclusion4 decks11.7K decks
Esika, God of the Tree
0.0%inclusion3 decks9.13K decks
Marina Vendrell
0.0%inclusion2 decks4.62K decks
Jodah, the Unifier
0.0%inclusion2 decks13.9K decks
Garth One-Eye
0.1%inclusion1 decks1.98K decks
New Cards
The Legend of Yangchen
6.6%inclusion30 decks454 decks
0%synergy
The Legend of Kyoshi
4.0%inclusion17 decks429 decks
-1%synergy
Rhys, the Evermore
3.7%inclusion1 decks27 decks
4%synergy
Wan Shi Tong, Librarian
3.6%inclusion17 decks468 decks
1%synergy
The Legend of Kuruk
3.5%inclusion16 decks462 decks
-1%synergy
High Synergy Cards
Sanctum Weaver
71%inclusion1.42K decks2.01K decks
61%synergy
Summon: Bahamut
66%inclusion1.33K decks2.01K decks
59%synergy
Summon: Primal Odin
61%inclusion1.23K decks2.01K decks
56%synergy
Summon: Yojimbo
61%inclusion1.21K decks2K decks
56%synergy
Sythis, Harvest's Hand
66%inclusion1.32K decks2.01K decks
55%synergy
The Apprentice's Folly
56%inclusion1.12K decks2.01K decks
55%synergy
Yuna, Hope of Spira
59%inclusion1.19K decks2.01K decks
55%synergy
Summon: Titan
59%inclusion1.13K decks1.92K decks
53%synergy
Summon: Knights of Round
55%inclusion1.08K decks1.96K decks
50%synergy
Summon: Fenrir
55%inclusion1.10K decks2.01K decks
50%synergy
Top Cards
Birds of Paradise
58%inclusion1.16K decks2.01K decks
33%synergy
Farseek
56%inclusion1.13K decks2.01K decks
13%synergy
Swords to Plowshares
52%inclusion1.04K decks2.01K decks
13%synergy
Eidolon of Blossoms
50%inclusion1K decks2.01K decks
43%synergy
Rydia, Summoner of Mist
49%inclusion881 decks1.81K decks
44%synergy
Enchantress's Presence
49%inclusion973 decks2.01K decks
41%synergy
Garnet, Princess of Alexandria
46%inclusion877 decks1.90K decks
42%synergy
Summon: Valefor
45%inclusion895 decks2K decks
41%synergy
O'aka, Traveling Merchant
45%inclusion894 decks2.01K decks
41%synergy
Summon: Shiva
44%inclusion881 decks2.01K decks
41%synergy
Game Changers
Rhystic Study
45%inclusion912 decks2.01K decks
24%synergy
Smothering Tithe
41%inclusion822 decks2.01K decks
22%synergy
Enlightened Tutor
37%inclusion745 decks2.01K decks
23%synergy
Fierce Guardianship
30%inclusion599 decks2.01K decks
17%synergy
Demonic Tutor
29%inclusion577 decks2.01K decks
10%synergy
Underworld Breach
24%inclusion481 decks2.01K decks
21%synergy
Vampiric Tutor
24%inclusion474 decks2.01K decks
9%synergy
Chrome Mox
16%inclusion321 decks2.01K decks
9%synergy
Gifts Ungiven
15%inclusion297 decks2.01K decks
14%synergy
Thassa's Oracle
14%inclusion288 decks2.01K decks
10%synergy
Creatures
Setessan Champion
44%inclusion875 decks2.01K decks
37%synergy
Summon: Esper Valigarmanda
43%inclusion861 decks2.01K decks
40%synergy
Jukai Naturalist
41%inclusion823 decks2.01K decks
33%synergy
Tom Bombadil
40%inclusion811 decks2.01K decks
39%synergy
Narci, Fable Singer
39%inclusion789 decks2.01K decks
36%synergy
Summon: Kujata
39%inclusion785 decks2.01K decks
36%synergy
Summon: Ixion
39%inclusion782 decks2.01K decks
36%synergy
Weaver of Harmony
38%inclusion770 decks2.01K decks
33%synergy
Dryad of the Ilysian Grove
37%inclusion735 decks2.01K decks
23%synergy
Yenna, Redtooth Regent
36%inclusion732 decks2.01K decks
33%synergy
Destiny Spinner
36%inclusion721 decks2.01K decks
31%synergy
Bloom Tender
34%inclusion680 decks2.01K decks
17%synergy
Summon: Brynhildr
28%inclusion503 decks1.82K decks
25%synergy
Ignoble Hierarch
28%inclusion552 decks2.01K decks
17%synergy
Summon: Good King Mog XII
27%inclusion541 decks2.01K decks
24%synergy
Faeburrow Elder
26%inclusion525 decks2.01K decks
7%synergy
Noble Hierarch
25%inclusion503 decks2.01K decks
16%synergy
Barbara Wright
25%inclusion493 decks2.01K decks
23%synergy
Zur, Eternal Schemer
24%inclusion487 decks2.01K decks
21%synergy
Joshua, Phoenix's Dominant
24%inclusion456 decks1.92K decks
21%synergy
Summon: Magus Sisters
24%inclusion472 decks2K decks
21%synergy
Summon: Anima
23%inclusion442 decks1.96K decks
20%synergy
Satsuki, the Living Lore
22%inclusion451 decks2.01K decks
19%synergy
Anikthea, Hand of Erebos
22%inclusion439 decks2.01K decks
20%synergy
Summon: G.F. Ifrit
21%inclusion382 decks1.82K decks
19%synergy
Esper Sentinel
20%inclusion402 decks2.01K decks
11%synergy
Sigurd, Jarl of Ravensthorpe
19%inclusion380 decks2.01K decks
16%synergy
Overlord of the Hauntwoods
18%inclusion369 decks2.01K decks
16%synergy
Jill, Shiva's Dominant
18%inclusion353 decks2.01K decks
15%synergy
Squee, the Immortal
17%inclusion342 decks2.01K decks
16%synergy
Summon: Primal Garuda
17%inclusion334 decks1.96K decks
15%synergy
The Master of Keys
17%inclusion332 decks2.01K decks
15%synergy
Summon: Leviathan
16%inclusion327 decks2.01K decks
14%synergy
Delighted Halfling
16%inclusion324 decks2.01K decks
5%synergy
Yuna, Grand Summoner
16%inclusion319 decks2.01K decks
14%synergy
Deathrite Shaman
16%inclusion313 decks2.01K decks
10%synergy
Overlord of the Balemurk
15%inclusion307 decks2.01K decks
15%synergy
Scholar of New Horizons
15%inclusion301 decks2.01K decks
13%synergy
Voice of Victory
15%inclusion295 decks2.01K decks
12%synergy
Argothian Enchantress
14%inclusion289 decks2.01K decks
13%synergy
Herald of the Pantheon
14%inclusion289 decks2.01K decks
10%synergy
Tidus, Yuna's Guardian
14%inclusion280 decks2.01K decks
13%synergy
Ondu Spiritdancer
14%inclusion274 decks2.01K decks
12%synergy
Clive, Ifrit's Dominant
13%inclusion267 decks2.01K decks
11%synergy
Displacer Kitten
13%inclusion256 decks2.01K decks
10%synergy
Enduring Vitality
13%inclusion256 decks2.01K decks
7%synergy
Purphoros, God of the Forge
12%inclusion248 decks2.01K decks
10%synergy
Starfield Mystic
12%inclusion246 decks2.01K decks
9%synergy
Wildsear, Scouring Maw
12%inclusion237 decks2.01K decks
9%synergy
Summon: Fat Chocobo
12%inclusion212 decks1.83K decks
9%synergy
Instants
Heroic Intervention
36%inclusion731 decks2.01K decks
14%synergy
Moonmist
34%inclusion675 decks2.01K decks
32%synergy
An Offer You Can't Refuse
31%inclusion631 decks2.01K decks
21%synergy
Path to Exile
30%inclusion598 decks2.01K decks
2%synergy
Swan Song
29%inclusion578 decks2.01K decks
18%synergy
Counterspell
25%inclusion506 decks2.01K decks
2%synergy
Deflecting Swat
24%inclusion484 decks2.01K decks
14%synergy
Cyclonic Rift
24%inclusion472 decks2.01K decks
6%synergy
Silence
17%inclusion344 decks2.01K decks
11%synergy
Teferi's Protection
16%inclusion311 decks2.01K decks
0%synergy
Worldly Tutor
14%inclusion288 decks2.01K decks
4%synergy
Dark Ritual
14%inclusion287 decks2.01K decks
9%synergy
Flusterstorm
14%inclusion273 decks2.01K decks
9%synergy
Force of Will
14%inclusion271 decks2.01K decks
7%synergy
Mana Drain
13%inclusion252 decks2.01K decks
3%synergy
Brain Freeze
12%inclusion248 decks2.01K decks
10%synergy
Demonic Consultation
12%inclusion240 decks2.01K decks
9%synergy
Pact of Negation
11%inclusion227 decks2.01K decks
7%synergy
Deadly Rollick
11%inclusion227 decks2.01K decks
7%synergy
Mystical Tutor
11%inclusion227 decks2.01K decks
5%synergy
Dovin's Veto
11%inclusion221 decks2.01K decks
4%synergy
Arcane Denial
11%inclusion220 decks2.01K decks
4%synergy
Tainted Pact
11%inclusion219 decks2.01K decks
8%synergy
Noxious Revival
11%inclusion214 decks2.01K decks
9%synergy
Ephemerate
10%inclusion210 decks2.01K decks
8%synergy
Mental Misstep
10%inclusion208 decks2.01K decks
6%synergy
Force of Negation
10%inclusion195 decks2.01K decks
6%synergy
Mindbreak Trap
10%inclusion191 decks2.01K decks
6%synergy
Assassin's Trophy
9.4%inclusion188 decks2.01K decks
-4%synergy
Intuition
8.7%inclusion175 decks2.01K decks
6%synergy
Desynchronization
8.6%inclusion172 decks2.01K decks
5%synergy
Clockspinning
8.4%inclusion168 decks2.01K decks
7%synergy
Beast Within
8.2%inclusion164 decks2.01K decks
-4%synergy
Borne Upon a Wind
7.9%inclusion158 decks2.01K decks
6%synergy
Entomb
6.9%inclusion139 decks2.01K decks
5%synergy
Nature's Claim
6.4%inclusion128 decks2.01K decks
4%synergy
Negate
6.1%inclusion123 decks2.01K decks
-3%synergy
Veil of Summer
5.5%inclusion111 decks2.01K decks
3%synergy
Restoration Magic
5.5%inclusion102 decks1.85K decks
4%synergy
Abrupt Decay
5.0%inclusion101 decks2.01K decks
1%synergy
Sorceries
Nature's Lore
42%inclusion843 decks2.01K decks
15%synergy
Esper Origins
40%inclusion811 decks2.01K decks
37%synergy
Three Visits
40%inclusion808 decks2.01K decks
17%synergy
Clash of the Eikons
29%inclusion553 decks1.90K decks
26%synergy
Sevinne's Reclamation
22%inclusion440 decks2.01K decks
18%synergy
Cultivate
22%inclusion434 decks2.01K decks
-12%synergy
Resurgent Belief
21%inclusion426 decks2.01K decks
17%synergy
Irenicus's Vile Duplication
20%inclusion411 decks2.01K decks
20%synergy
Replenish
20%inclusion402 decks2.01K decks
18%synergy
Reanimate
20%inclusion402 decks2.01K decks
16%synergy
Eerie Ultimatum
19%inclusion381 decks2.01K decks
11%synergy
Rampant Growth
18%inclusion357 decks2.01K decks
-3%synergy
Extinguish All Hope
13%inclusion266 decks2.01K decks
11%synergy
Idyllic Tutor
13%inclusion256 decks2.01K decks
8%synergy
Farewell
11%inclusion223 decks2.01K decks
3%synergy
Redress Fate
11%inclusion211 decks2.01K decks
9%synergy
Quantum Misalignment
10%inclusion206 decks2.01K decks
10%synergy
Kodama's Reach
10%inclusion201 decks2.01K decks
-12%synergy
Culling Ritual
10%inclusion197 decks2.01K decks
7%synergy
Imperial Seal
10%inclusion194 decks2.01K decks
6%synergy
Gamble
9.2%inclusion185 decks2.01K decks
6%synergy
Diabolic Intent
8.3%inclusion166 decks2.01K decks
5%synergy
Nature's Rhythm
8.0%inclusion161 decks2.01K decks
6%synergy
Blasphemous Act
8.0%inclusion161 decks2.01K decks
-2%synergy
Dance of the Manse
7.4%inclusion149 decks2.01K decks
4%synergy
Toxic Deluge
7.2%inclusion144 decks2.01K decks
3%synergy
Skyshroud Claim
6.2%inclusion124 decks2.01K decks
-2%synergy
Jeska's Will
6.1%inclusion122 decks2.01K decks
4%synergy
Damning Verdict
5.7%inclusion114 decks2.01K decks
5%synergy
Wheel of Fortune
5.4%inclusion109 decks2.01K decks
3%synergy
Bala Ged Recovery
5.2%inclusion105 decks2.01K decks
3%synergy
Utility Artifacts
Power Conduit
21%inclusion431 decks2.01K decks
19%synergy
Summoner's Grimoire
19%inclusion374 decks2.01K decks
16%synergy
The One Ring
16%inclusion326 decks2.01K decks
7%synergy
Lightning Greaves
15%inclusion297 decks2.01K decks
-2%synergy
Swiftfoot Boots
9.3%inclusion186 decks2.01K decks
-3%synergy
Crystal Fragments
8.3%inclusion158 decks1.91K decks
7%synergy
Wishclaw Talisman
7.0%inclusion141 decks2.01K decks
4%synergy
Strionic Resonator
5.3%inclusion106 decks2.01K decks
3%synergy
Enchantments
Binding the Old Gods
39%inclusion779 decks2.01K decks
34%synergy
Sterling Grove
37%inclusion745 decks2.01K decks
29%synergy
Starfield of Nyx
35%inclusion708 decks2.01K decks
32%synergy
Mystic Remora
35%inclusion708 decks2.01K decks
24%synergy
The Eldest Reborn
33%inclusion656 decks2.01K decks
29%synergy
Utopia Sprawl
32%inclusion643 decks2.01K decks
29%synergy
Wild Growth
31%inclusion615 decks2.01K decks
27%synergy
Elspeth Conquers Death
27%inclusion533 decks2.01K decks
23%synergy
Fable of the Mirror-Breaker
26%inclusion518 decks2.01K decks
24%synergy
The Kami War
25%inclusion503 decks2.01K decks
20%synergy
Animate Dead
24%inclusion483 decks2.01K decks
22%synergy
Estrid's Invocation
24%inclusion477 decks2.01K decks
22%synergy
There and Back Again
21%inclusion423 decks2.01K decks
17%synergy
Awaken the Honored Dead
20%inclusion411 decks2.01K decks
19%synergy
Food Chain
19%inclusion373 decks2.01K decks
17%synergy
The Cruelty of Gix
18%inclusion368 decks2.01K decks
16%synergy
Fertile Ground
18%inclusion364 decks2.01K decks
14%synergy
Sphere of Safety
17%inclusion351 decks2.01K decks
11%synergy
Carpet of Flowers
17%inclusion349 decks2.01K decks
15%synergy
Sylvan Library
15%inclusion306 decks2.01K decks
10%synergy
Kiora Bests the Sea God
15%inclusion293 decks2.01K decks
12%synergy
Three Blind Mice
13%inclusion265 decks2.01K decks
13%synergy
Mirrormade
13%inclusion264 decks2.01K decks
12%synergy
The Bath Song
13%inclusion257 decks2.01K decks
10%synergy
Ballad of the Black Flag
12%inclusion248 decks2.01K decks
10%synergy
Touch the Spirit Realm
12%inclusion243 decks2.01K decks
11%synergy
Rhythm of the Wild
12%inclusion233 decks2.01K decks
1%synergy
Copy Enchantment
12%inclusion232 decks2.01K decks
11%synergy
Mirari's Wake
11%inclusion227 decks2.01K decks
2%synergy
Ghostly Prison
11%inclusion212 decks2.01K decks
4%synergy
Necromancy
10%inclusion206 decks2.01K decks
9%synergy
Propaganda
10%inclusion206 decks2.01K decks
3%synergy
Necropotence
8.6%inclusion172 decks2.01K decks
7%synergy
The Mending of Dominaria
8.5%inclusion171 decks2.01K decks
8%synergy
Black Market Connections
7.9%inclusion159 decks2.01K decks
3%synergy
War of the Last Alliance
7.1%inclusion142 decks2.01K decks
5%synergy
Leyline of the Guildpact
6.6%inclusion133 decks2.01K decks
-9%synergy
Historian's Boon
6.4%inclusion129 decks2.01K decks
4%synergy
Ripples of Undeath
6.0%inclusion121 decks2.01K decks
6%synergy
Birth of the Imperium
6.0%inclusion120 decks2.01K decks
4%synergy
Temur Ascendancy
5.8%inclusion117 decks2.01K decks
-4%synergy
Trace of Abundance
5.7%inclusion115 decks2.01K decks
4%synergy
Kenrith's Transformation
5.4%inclusion109 decks2.01K decks
4%synergy
Grasp of Fate
5.3%inclusion106 decks2.01K decks
4%synergy
Leyline Binding
5.1%inclusion102 decks2.01K decks
4%synergy
Planeswalkers
Teferi, Time Raveler
5.6%inclusion113 decks2.01K decks
2%synergy
Utility Lands
Hall of Heliod's Generosity
45%inclusion893 decks2.01K decks
38%synergy
Nesting Grounds
36%inclusion713 decks2.01K decks
32%synergy
Boseiju, Who Endures
29%inclusion585 decks2.01K decks
18%synergy
Ancient Tomb
16%inclusion324 decks2.01K decks
7%synergy
Yavimaya, Cradle of Growth
16%inclusion319 decks2.01K decks
6%synergy
Ishgard, the Holy See
15%inclusion310 decks2.01K decks
11%synergy
Urza's Saga
15%inclusion298 decks2.01K decks
10%synergy
Reliquary Tower
14%inclusion283 decks2.01K decks
-12%synergy
Otawara, Soaring City
13%inclusion266 decks2.01K decks
7%synergy
Shifting Woodland
12%inclusion243 decks2.01K decks
10%synergy
Mistrise Village
11%inclusion222 decks2.01K decks
7%synergy
Serra's Sanctum
10%inclusion198 decks2.01K decks
8%synergy
Karn's Bastion
10%inclusion197 decks2.01K decks
6%synergy
Cascading Cataracts
5.6%inclusion112 decks2.01K decks
-11%synergy
Urborg, Tomb of Yawgmoth
5.4%inclusion109 decks2.01K decks
-1%synergy
Gaea's Cradle
5.2%inclusion105 decks2.01K decks
1%synergy
Mana Artifacts
Sol Ring
89%inclusion1.78K decks2.01K decks
10%synergy
Arcane Signet
82%inclusion1.65K decks2.01K decks
7%synergy
Chromatic Lantern
40%inclusion797 decks2.01K decks
-10%synergy
Fellwar Stone
36%inclusion713 decks2.01K decks
5%synergy
Lotus Petal
18%inclusion356 decks2.01K decks
11%synergy
Mana Vault
15%inclusion303 decks2.01K decks
8%synergy
Mox Diamond
12%inclusion233 decks2.01K decks
6%synergy
Lion's Eye Diamond
10%inclusion204 decks2.01K decks
7%synergy
Mox Amber
10%inclusion192 decks2.01K decks
3%synergy
Commander's Sphere
6.5%inclusion131 decks2.01K decks
-11%synergy
Lands
Command Tower
94%inclusion1.89K decks2.01K decks
6%synergy
Exotic Orchard
71%inclusion1.43K decks2.01K decks
10%synergy
Windswept Heath
59%inclusion1.18K decks2.01K decks
31%synergy
Wooded Foothills
56%inclusion1.13K decks2.01K decks
30%synergy
Misty Rainforest
55%inclusion1.10K decks2.01K decks
28%synergy
Breeding Pool
55%inclusion1.10K decks2.01K decks
25%synergy
Stomping Ground
53%inclusion1.07K decks2.01K decks
24%synergy
Temple Garden
52%inclusion1.04K decks2.01K decks
23%synergy
Flooded Strand
52%inclusion1.04K decks2.01K decks
27%synergy
Verdant Catacombs
51%inclusion1.03K decks2.01K decks
25%synergy
Overgrown Tomb
48%inclusion955 decks2.01K decks
20%synergy
Marsh Flats
46%inclusion916 decks2.01K decks
22%synergy
Polluted Delta
46%inclusion916 decks2.01K decks
22%synergy
Hallowed Fountain
45%inclusion893 decks2.01K decks
19%synergy
Bloodstained Mire
44%inclusion884 decks2.01K decks
22%synergy
Arid Mesa
44%inclusion884 decks2.01K decks
21%synergy
Scalding Tarn
43%inclusion857 decks2.01K decks
19%synergy
Sacred Foundry
41%inclusion831 decks2.01K decks
18%synergy
Godless Shrine
41%inclusion819 decks2.01K decks
16%synergy
City of Brass
37%inclusion752 decks2.01K decks
18%synergy
Watery Grave
37%inclusion747 decks2.01K decks
13%synergy
Mana Confluence
36%inclusion728 decks2.01K decks
17%synergy
Steam Vents
34%inclusion691 decks2.01K decks
11%synergy
Spara's Headquarters
31%inclusion614 decks2.01K decks
10%synergy
Ketria Triome
30%inclusion602 decks2.01K decks
6%synergy
Indatha Triome
30%inclusion594 decks2.01K decks
7%synergy
Jetmir's Garden
29%inclusion591 decks2.01K decks
9%synergy
Blood Crypt
29%inclusion591 decks2.01K decks
9%synergy
Starting Town
29%inclusion587 decks2.01K decks
20%synergy
The World Tree
28%inclusion568 decks2.01K decks
0%synergy
Path of Ancestry
25%inclusion510 decks2.01K decks
-17%synergy
Taiga
23%inclusion460 decks2.01K decks
10%synergy
Tropical Island
23%inclusion460 decks2.01K decks
10%synergy
Reflecting Pool
23%inclusion456 decks2.01K decks
6%synergy
Savannah
23%inclusion452 decks2.01K decks
10%synergy
Bayou
22%inclusion451 decks2.01K decks
9%synergy
Ziatora's Proving Ground
22%inclusion440 decks2.01K decks
3%synergy
Tundra
21%inclusion431 decks2.01K decks
9%synergy
Zagoth Triome
21%inclusion431 decks2.01K decks
0%synergy
Underground Sea
20%inclusion407 decks2.01K decks
8%synergy
Volcanic Island
20%inclusion401 decks2.01K decks
8%synergy
Scrubland
19%inclusion386 decks2.01K decks
7%synergy
Badlands
19%inclusion374 decks2.01K decks
7%synergy
Plateau
18%inclusion366 decks2.01K decks
7%synergy
Gemstone Caverns
15%inclusion296 decks2.01K decks
9%synergy
Raugrin Triome
14%inclusion275 decks2.01K decks
-4%synergy
Savai Triome
13%inclusion253 decks2.01K decks
-4%synergy
Canopy Vista
12%inclusion245 decks2.01K decks
2%synergy
Evolving Wilds
12%inclusion245 decks2.01K decks
-8%synergy
Raffine's Tower
12%inclusion237 decks2.01K decks
-2%synergy