The Master of Keys (Commander) - Expensive Upgraded

The Master of Keys
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Background image for What if Thassa's Oracle Were Banned?
Harvey McGuinness
Sep 23, 2025
Harvey McGuinness
What if Thassa's Oracle Were Banned?
What would happen to cEDH if Thassa's Oracle were banned tomorrow? Would the best decks fall apart? Would there be a new meta? Let's discuss.
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Utility Artifacts
Enchantments
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Utility Lands
Mana Artifacts
Lands
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Noggle the Mind
20%inclusion1 decks5 decks
20%synergy
High Synergy Cards
Animate Dead
84%inclusion37 decks44 decks
74%synergy
Ripples of Undeath
75%inclusion33 decks44 decks
72%synergy
Necromancy
70%inclusion31 decks44 decks
66%synergy
Inquisitive Glimmer
68%inclusion30 decks44 decks
61%synergy
Dance of the Dead
61%inclusion27 decks44 decks
59%synergy
Dress Down
57%inclusion25 decks44 decks
54%synergy
Entity Tracker
57%inclusion25 decks44 decks
50%synergy
Sevinne's Reclamation
59%inclusion26 decks44 decks
50%synergy
Amphibian Downpour
55%inclusion24 decks44 decks
50%synergy
Mirrormade
59%inclusion26 decks44 decks
49%synergy
Top Cards
Mystic Remora
61%inclusion27 decks44 decks
40%synergy
Propaganda
57%inclusion25 decks44 decks
30%synergy
Swords to Plowshares
55%inclusion24 decks44 decks
-14%synergy
Sphere of Safety
52%inclusion23 decks44 decks
43%synergy
Demon of Fate's Design
50%inclusion22 decks44 decks
45%synergy
Entomb
48%inclusion21 decks44 decks
41%synergy
Ghostly Prison
48%inclusion21 decks44 decks
26%synergy
Zur the Enchanter
45%inclusion20 decks44 decks
40%synergy
The Meathook Massacre
45%inclusion20 decks44 decks
42%synergy
Mana Drain
45%inclusion20 decks44 decks
28%synergy
Game Changers
Smothering Tithe
48%inclusion21 decks44 decks
16%synergy
Rhystic Study
45%inclusion20 decks44 decks
13%synergy
Serra's Sanctum
20%inclusion9 decks44 decks
19%synergy
Enlightened Tutor
18%inclusion8 decks44 decks
-2%synergy
Gifts Ungiven
16%inclusion7 decks44 decks
14%synergy
The One Ring
16%inclusion7 decks44 decks
2%synergy
Demonic Tutor
14%inclusion6 decks44 decks
-8%synergy
Teferi's Protection
14%inclusion6 decks44 decks
-3%synergy
Intuition
14%inclusion6 decks44 decks
12%synergy
Ancient Tomb
11%inclusion5 decks44 decks
-2%synergy
Creatures
Overlord of the Balemurk
43%inclusion19 decks44 decks
41%synergy
Scrabbling Skullcrab
43%inclusion19 decks44 decks
42%synergy
Mesa Enchantress
43%inclusion19 decks44 decks
34%synergy
Starfield Mystic
41%inclusion18 decks44 decks
34%synergy
Gravebreaker Lamia
39%inclusion17 decks44 decks
38%synergy
Fear of Impostors
36%inclusion16 decks44 decks
35%synergy
Overlord of the Floodpits
36%inclusion16 decks44 decks
33%synergy
Esper Sentinel
36%inclusion16 decks44 decks
9%synergy
Ondu Spiritdancer
32%inclusion14 decks44 decks
26%synergy
Fear of Sleep Paralysis
32%inclusion14 decks44 decks
26%synergy
Zur, Eternal Schemer
32%inclusion14 decks44 decks
29%synergy
Victor, Valgavoth's Seneschal
30%inclusion13 decks44 decks
28%synergy
Lotho, Corrupt Shirriff
30%inclusion13 decks44 decks
13%synergy
Doomwake Giant
30%inclusion13 decks44 decks
24%synergy
Hedron Crab
25%inclusion11 decks44 decks
24%synergy
Overlord of the Mistmoors
23%inclusion10 decks44 decks
21%synergy
Enduring Curiosity
23%inclusion10 decks44 decks
15%synergy
Ghostly Dancers
20%inclusion9 decks44 decks
18%synergy
Abdel Adrian, Gorion's Ward
20%inclusion9 decks44 decks
19%synergy
Sage of Mysteries
20%inclusion9 decks44 decks
20%synergy
Psychic Frog
20%inclusion9 decks44 decks
14%synergy
Ledger Shredder
20%inclusion9 decks44 decks
12%synergy
Lurrus of the Dream-Den
20%inclusion9 decks44 decks
19%synergy
Hullbreaker Horror
20%inclusion9 decks44 decks
14%synergy
Silent Hallcreeper
18%inclusion8 decks44 decks
14%synergy
Grim Guardian
18%inclusion8 decks44 decks
16%synergy
Aminatou, Veil Piercer
18%inclusion8 decks44 decks
17%synergy
Witch Enchanter
16%inclusion7 decks44 decks
9%synergy
Displacer Kitten
16%inclusion7 decks44 decks
9%synergy
Moon-Blessed Cleric
16%inclusion7 decks44 decks
11%synergy
Valgavoth, Terror Eater
14%inclusion6 decks44 decks
10%synergy
Archon of Sun's Grace
14%inclusion6 decks44 decks
9%synergy
Boggart Trawler
14%inclusion6 decks44 decks
11%synergy
Sun Titan
14%inclusion6 decks44 decks
5%synergy
Heliod, the Radiant Dawn
14%inclusion6 decks44 decks
10%synergy
Grand Abolisher
14%inclusion6 decks44 decks
-1%synergy
Emet-Selch of the Third Seat
12%inclusion4 decks34 decks
2%synergy
Valley Floodcaller
11%inclusion5 decks44 decks
7%synergy
Leonin Relic-Warder
9.1%inclusion4 decks44 decks
9%synergy
Laboratory Maniac
9.1%inclusion4 decks44 decks
6%synergy
Toxrill, the Corrosive
9.1%inclusion4 decks44 decks
6%synergy
Sheoldred, the Apocalypse
9.1%inclusion4 decks44 decks
0%synergy
Soaring Lightbringer
9.1%inclusion4 decks44 decks
4%synergy
Neerdiv, Devious Diver
9.1%inclusion4 decks44 decks
9%synergy
Summon: Yojimbo
8.8%inclusion3 decks34 decks
8%synergy
Astelli Reclaimer
6.9%inclusion2 decks29 decks
7%synergy
Thassa's Oracle
6.8%inclusion3 decks44 decks
-3%synergy
Doom Whisperer
6.8%inclusion3 decks44 decks
5%synergy
Spirited Companion
6.8%inclusion3 decks44 decks
5%synergy
Ghostly Pilferer
6.8%inclusion3 decks44 decks
-1%synergy
Instants
Swan Song
41%inclusion18 decks44 decks
21%synergy
Sink into Stupor
36%inclusion16 decks44 decks
24%synergy
Dark Ritual
34%inclusion15 decks44 decks
15%synergy
An Offer You Can't Refuse
32%inclusion14 decks44 decks
5%synergy
Counterspell
32%inclusion14 decks44 decks
-10%synergy
Arcane Denial
25%inclusion11 decks44 decks
5%synergy
Path to Exile
23%inclusion10 decks44 decks
-19%synergy
Fell the Profane
18%inclusion8 decks44 decks
9%synergy
Void Rend
18%inclusion8 decks44 decks
-16%synergy
Cabal Ritual
18%inclusion8 decks44 decks
15%synergy
Dovin's Veto
16%inclusion7 decks44 decks
-9%synergy
Thirst for Meaning
14%inclusion6 decks44 decks
12%synergy
Strix Serenade
11%inclusion5 decks44 decks
8%synergy
Force of Negation
11%inclusion5 decks44 decks
-1%synergy
Frantic Search
11%inclusion5 decks44 decks
-6%synergy
Cyclonic Rift
11%inclusion5 decks44 decks
-13%synergy
Brain Freeze
9.1%inclusion4 decks44 decks
9%synergy
Flusterstorm
9.1%inclusion4 decks44 decks
1%synergy
Fierce Guardianship
9.1%inclusion4 decks44 decks
-12%synergy
Generous Gift
9.1%inclusion4 decks44 decks
-6%synergy
Anguished Unmaking
9.1%inclusion4 decks44 decks
-16%synergy
Otherworldly Gaze
9.1%inclusion4 decks44 decks
7%synergy
Inkshield
9.1%inclusion4 decks44 decks
0%synergy
Consult the Star Charts
6.9%inclusion2 decks29 decks
6%synergy
Silence
6.8%inclusion3 decks44 decks
-4%synergy
Perplex
6.8%inclusion3 decks44 decks
6%synergy
Negate
6.8%inclusion3 decks44 decks
-10%synergy
Brainstorm
6.8%inclusion3 decks44 decks
-10%synergy
Darkblast
6.8%inclusion3 decks44 decks
7%synergy
Into the Flood Maw
6.8%inclusion3 decks44 decks
3%synergy
Delay
6.8%inclusion3 decks44 decks
5%synergy
Borne Upon a Wind
6.8%inclusion3 decks44 decks
2%synergy
Malakir Rebirth
6.8%inclusion3 decks44 decks
2%synergy
Sorceries
Reanimate
34%inclusion15 decks44 decks
18%synergy
Replenish
32%inclusion14 decks44 decks
30%synergy
Toxic Deluge
30%inclusion13 decks44 decks
10%synergy
Singularity Rupture
28%inclusion8 decks29 decks
25%synergy
Redress Fate
27%inclusion12 decks44 decks
21%synergy
Windfall
23%inclusion10 decks44 decks
9%synergy
Farewell
18%inclusion8 decks44 decks
5%synergy
Extinguish All Hope
18%inclusion8 decks44 decks
17%synergy
Damn
18%inclusion8 decks44 decks
-2%synergy
Space-Time Anomaly
18%inclusion5 decks28 decks
16%synergy
Glimpse the Unthinkable
16%inclusion7 decks44 decks
15%synergy
Supreme Verdict
14%inclusion6 decks44 decks
-1%synergy
Idyllic Tutor
11%inclusion5 decks44 decks
7%synergy
Dance of the Manse
11%inclusion5 decks44 decks
8%synergy
Ponder
9.1%inclusion4 decks44 decks
0%synergy
Demonic Counsel
9.1%inclusion4 decks44 decks
8%synergy
Resurgent Belief
9.1%inclusion4 decks44 decks
7%synergy
Beseech the Mirror
9.1%inclusion4 decks44 decks
5%synergy
Austere Command
6.8%inclusion3 decks44 decks
-2%synergy
Lively Dirge
6.8%inclusion3 decks44 decks
6%synergy
Traumatize
6.8%inclusion3 decks44 decks
6%synergy
Utility Artifacts
Mesmeric Orb
30%inclusion13 decks44 decks
28%synergy
Lightning Greaves
16%inclusion7 decks44 decks
-6%synergy
Cloud Key
14%inclusion6 decks44 decks
10%synergy
Wishclaw Talisman
11%inclusion5 decks44 decks
3%synergy
Wayfarer's Bauble
6.8%inclusion3 decks44 decks
-1%synergy
Crucible of Worlds
6.8%inclusion3 decks44 decks
6%synergy
Perpetual Timepiece
6.8%inclusion3 decks44 decks
6%synergy
Swiftfoot Boots
6.8%inclusion3 decks44 decks
-17%synergy
Enchantments
Secret Arcade // Dusty Parlor
41%inclusion18 decks44 decks
36%synergy
Blind Obedience
39%inclusion17 decks44 decks
26%synergy
Seal of Cleansing
36%inclusion16 decks44 decks
35%synergy
Estrid's Invocation
34%inclusion15 decks44 decks
30%synergy
Sigil of the Empty Throne
32%inclusion14 decks44 decks
26%synergy
Grasp of Fate
32%inclusion14 decks44 decks
26%synergy
Cemetery Tampering
32%inclusion14 decks44 decks
31%synergy
Black Market Connections
32%inclusion14 decks44 decks
18%synergy
Out of the Tombs
30%inclusion13 decks44 decks
29%synergy
Imprisoned in the Moon
30%inclusion13 decks44 decks
23%synergy
Polluted Cistern // Dim Oubliette
30%inclusion13 decks44 decks
29%synergy
Copy Enchantment
27%inclusion12 decks44 decks
23%synergy
Stillness in Motion
26%inclusion10 decks39 decks
25%synergy
Seal of Removal
25%inclusion11 decks44 decks
24%synergy
Trouble in Pairs
25%inclusion11 decks44 decks
20%synergy
Starfield of Nyx
25%inclusion11 decks44 decks
21%synergy
Touch the Spirit Realm
23%inclusion10 decks44 decks
20%synergy
Greater Auramancy
23%inclusion10 decks44 decks
18%synergy
Darksteel Mutation
20%inclusion9 decks44 decks
14%synergy
Static Prison
20%inclusion9 decks44 decks
20%synergy
Aura of Silence
20%inclusion9 decks44 decks
17%synergy
Tinybones Joins Up
18%inclusion8 decks44 decks
17%synergy
Land Tax
18%inclusion8 decks44 decks
12%synergy
Defiled Crypt // Cadaver Lab
18%inclusion8 decks44 decks
17%synergy
The Tale of Tamiyo
18%inclusion8 decks44 decks
18%synergy
Mirror Room // Fractured Realm
18%inclusion8 decks44 decks
16%synergy
All That Glitters
16%inclusion7 decks44 decks
7%synergy
Enchanted Evening
16%inclusion7 decks44 decks
14%synergy
Phyrexian Arena
16%inclusion7 decks44 decks
2%synergy
Extravagant Replication
16%inclusion7 decks44 decks
11%synergy
Bottomless Pool // Locker Room
16%inclusion7 decks44 decks
14%synergy
Solitary Confinement
16%inclusion7 decks44 decks
14%synergy
Bloodchief Ascension
16%inclusion7 decks44 decks
10%synergy
Timely Ward
16%inclusion7 decks44 decks
11%synergy
Dazzling Theater // Prop Room
16%inclusion7 decks44 decks
14%synergy
Sheltered by Ghosts
16%inclusion7 decks44 decks
13%synergy
Teval's Judgment
15%inclusion6 decks39 decks
15%synergy
Parallax Wave
14%inclusion6 decks44 decks
13%synergy
Court of Cunning
14%inclusion6 decks44 decks
13%synergy
Authority of the Consuls
14%inclusion6 decks44 decks
2%synergy
Copy Artifact
14%inclusion6 decks44 decks
13%synergy
Shark Typhoon
14%inclusion6 decks44 decks
8%synergy
One with the Multiverse
14%inclusion6 decks44 decks
9%synergy
Out of Time
14%inclusion6 decks44 decks
13%synergy
Leyline of Anticipation
14%inclusion6 decks44 decks
9%synergy
Funeral Room // Awakening Hall
14%inclusion6 decks44 decks
13%synergy
Hallowed Haunting
14%inclusion6 decks44 decks
11%synergy
Cacophony Unleashed
14%inclusion6 decks44 decks
12%synergy
Tempest Technique
13%inclusion5 decks39 decks
12%synergy
Chronic Flooding
11%inclusion5 decks44 decks
11%synergy
Planeswalkers
Teferi, Time Raveler
11%inclusion5 decks44 decks
3%synergy
Ashiok, Dream Render
6.8%inclusion3 decks44 decks
5%synergy
Utility Lands
Hall of Heliod's Generosity
50%inclusion22 decks44 decks
37%synergy
Otawara, Soaring City
50%inclusion22 decks44 decks
31%synergy
Bojuka Bog
30%inclusion13 decks44 decks
2%synergy
Takenuma, Abandoned Mire
27%inclusion12 decks44 decks
21%synergy
Cephalid Coliseum
27%inclusion12 decks44 decks
24%synergy
Urza's Saga
27%inclusion12 decks44 decks
15%synergy
Urborg, Tomb of Yawgmoth
25%inclusion11 decks44 decks
12%synergy
Reliquary Tower
16%inclusion7 decks44 decks
-18%synergy
Eiganjo, Seat of the Empire
14%inclusion6 decks44 decks
9%synergy
Mystic Sanctuary
14%inclusion6 decks44 decks
10%synergy
Minamo, School at Water's Edge
6.8%inclusion3 decks44 decks
3%synergy
Bazaar of Baghdad
6.8%inclusion3 decks44 decks
6%synergy
Geier Reach Sanitarium
6.8%inclusion3 decks44 decks
3%synergy
Mana Artifacts
Sol Ring
98%inclusion43 decks44 decks
8%synergy
Arcane Signet
86%inclusion38 decks44 decks
-2%synergy
Talisman of Progress
59%inclusion26 decks44 decks
16%synergy
Talisman of Dominance
59%inclusion26 decks44 decks
10%synergy
Talisman of Hierarchy
55%inclusion24 decks44 decks
11%synergy
Fellwar Stone
39%inclusion17 decks44 decks
5%synergy
Azorius Signet
18%inclusion8 decks44 decks
-14%synergy
Orzhov Signet
16%inclusion7 decks44 decks
-18%synergy
Lotus Petal
16%inclusion7 decks44 decks
5%synergy
Dimir Signet
14%inclusion6 decks44 decks
-18%synergy
Mox Opal
9.1%inclusion4 decks44 decks
0%synergy
Mox Amber
9.1%inclusion4 decks44 decks
3%synergy
Thought Vessel
6.8%inclusion3 decks44 decks
-18%synergy
Lands
Command Tower
100%inclusion44 decks44 decks
7%synergy
Watery Grave
95%inclusion42 decks44 decks
45%synergy
Godless Shrine
95%inclusion42 decks44 decks
45%synergy
Hallowed Fountain
95%inclusion42 decks44 decks
46%synergy
Scrubland
91%inclusion40 decks44 decks
75%synergy
Polluted Delta
89%inclusion39 decks44 decks
51%synergy
Tundra
89%inclusion39 decks44 decks
73%synergy
Underground Sea
89%inclusion39 decks44 decks
73%synergy
Flooded Strand
89%inclusion39 decks44 decks
51%synergy
Marsh Flats
86%inclusion38 decks44 decks
50%synergy
Swamp
82%inclusion36 decks44 decks
-10%synergy
Island
82%inclusion36 decks44 decks
-11%synergy
Plains
82%inclusion36 decks44 decks
-10%synergy
Raffine's Tower
73%inclusion32 decks44 decks
32%synergy
Undercity Sewers
66%inclusion29 decks44 decks
52%synergy
Sea of Clouds
61%inclusion27 decks44 decks
26%synergy
Meticulous Archive
61%inclusion27 decks44 decks
48%synergy
Vault of Champions
61%inclusion27 decks44 decks
29%synergy
Shadowy Backstreet
57%inclusion25 decks44 decks
44%synergy
Morphic Pool
52%inclusion23 decks44 decks
18%synergy
Exotic Orchard
50%inclusion22 decks44 decks
-9%synergy
Misty Rainforest
48%inclusion21 decks44 decks
37%synergy
Arid Mesa
41%inclusion18 decks44 decks
31%synergy
Scalding Tarn
39%inclusion17 decks44 decks
27%synergy
Floodfarm Verge
39%inclusion17 decks44 decks
27%synergy
Mana Confluence
36%inclusion16 decks44 decks
22%synergy
City of Brass
36%inclusion16 decks44 decks
21%synergy
Windswept Heath
36%inclusion16 decks44 decks
26%synergy
Sink into Stupor
36%inclusion16 decks44 decks
24%synergy
Bloodstained Mire
36%inclusion16 decks44 decks
25%synergy
Prismatic Vista
34%inclusion15 decks44 decks
30%synergy
Verdant Catacombs
34%inclusion15 decks44 decks
24%synergy
Underground River
27%inclusion12 decks44 decks
-6%synergy
Gloomlake Verge
27%inclusion12 decks44 decks
16%synergy
Adarkar Wastes
25%inclusion11 decks44 decks
-6%synergy
Caves of Koilos
25%inclusion11 decks44 decks
-10%synergy
Arcane Sanctum
25%inclusion11 decks44 decks
-30%synergy
Glacial Fortress
23%inclusion10 decks44 decks
-18%synergy
Valgavoth's Lair
20%inclusion9 decks44 decks
18%synergy
Azorius Chancery
20%inclusion9 decks44 decks
6%synergy
Drowned Catacomb
20%inclusion9 decks44 decks
-16%synergy
Fell the Profane
18%inclusion8 decks44 decks
9%synergy
Bleachbone Verge
18%inclusion8 decks44 decks
10%synergy
Witch Enchanter
16%inclusion7 decks44 decks
9%synergy
Isolated Chapel
16%inclusion7 decks44 decks
-23%synergy
Deserted Beach
16%inclusion7 decks44 decks
-5%synergy
Gemstone Caverns
14%inclusion6 decks44 decks
6%synergy
Reflecting Pool
14%inclusion6 decks44 decks
6%synergy
Boggart Trawler
14%inclusion6 decks44 decks
11%synergy
Starting Town
12%inclusion4 decks34 decks
8%synergy
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