The Master of Keys (Commander) - 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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Instants
Sorceries
Utility Artifacts
Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
Back to Top
Noggle the Mind
6.3%inclusion4 decks64 decks
6%synergy
Twilight Diviner
3.1%inclusion2 decks64 decks
2%synergy
Mornsong Aria
2.8%inclusion2 decks71 decks
2%synergy
High Synergy Cards
Inquisitive Glimmer
78%inclusion352 decks449 decks
71%synergy
Ripples of Undeath
73%inclusion326 decks449 decks
70%synergy
Entity Tracker
71%inclusion317 decks449 decks
64%synergy
Starfield Mystic
66%inclusion296 decks449 decks
59%synergy
Animate Dead
67%inclusion302 decks449 decks
58%synergy
Gravebreaker Lamia
58%inclusion262 decks449 decks
57%synergy
Mesa Enchantress
65%inclusion294 decks449 decks
56%synergy
Demon of Fate's Design
61%inclusion272 decks449 decks
55%synergy
Dress Down
55%inclusion247 decks449 decks
53%synergy
Scrabbling Skullcrab
53%inclusion238 decks449 decks
52%synergy
Top Cards
Fear of Sleep Paralysis
57%inclusion254 decks449 decks
51%synergy
Doomwake Giant
55%inclusion247 decks449 decks
49%synergy
Mystic Remora
53%inclusion238 decks449 decks
32%synergy
Sphere of Safety
52%inclusion235 decks449 decks
43%synergy
Overlord of the Floodpits
51%inclusion231 decks449 decks
48%synergy
Necromancy
51%inclusion230 decks449 decks
47%synergy
Swords to Plowshares
51%inclusion228 decks449 decks
-17%synergy
Overlord of the Balemurk
49%inclusion221 decks449 decks
47%synergy
Secret Arcade // Dusty Parlor
49%inclusion221 decks449 decks
44%synergy
Mirrormade
49%inclusion220 decks449 decks
39%synergy
Game Changers
Smothering Tithe
38%inclusion170 decks449 decks
6%synergy
Rhystic Study
29%inclusion129 decks449 decks
-3%synergy
Enlightened Tutor
12%inclusion53 decks449 decks
-8%synergy
Gifts Ungiven
8.5%inclusion38 decks449 decks
6%synergy
Necropotence
7.1%inclusion32 decks449 decks
0%synergy
Cyclonic Rift
6.7%inclusion30 decks449 decks
-18%synergy
Serra's Sanctum
6.0%inclusion27 decks449 decks
4%synergy
Demonic Tutor
5.1%inclusion23 decks449 decks
-16%synergy
Creatures
Ondu Spiritdancer
46%inclusion207 decks449 decks
40%synergy
Victor, Valgavoth's Seneschal
46%inclusion205 decks449 decks
44%synergy
Zur, Eternal Schemer
45%inclusion200 decks449 decks
41%synergy
Fear of Impostors
44%inclusion199 decks449 decks
43%synergy
Silent Hallcreeper
34%inclusion152 decks449 decks
30%synergy
Zur the Enchanter
33%inclusion148 decks449 decks
28%synergy
Ghostly Dancers
31%inclusion139 decks449 decks
28%synergy
Enduring Curiosity
28%inclusion125 decks449 decks
20%synergy
Heliod, the Radiant Dawn
26%inclusion117 decks449 decks
22%synergy
Moon-Blessed Cleric
24%inclusion108 decks449 decks
19%synergy
Soaring Lightbringer
23%inclusion105 decks449 decks
18%synergy
Grim Guardian
23%inclusion102 decks449 decks
20%synergy
Archon of Sun's Grace
22%inclusion99 decks449 decks
17%synergy
Abdel Adrian, Gorion's Ward
20%inclusion88 decks449 decks
18%synergy
Overlord of the Mistmoors
17%inclusion77 decks449 decks
15%synergy
Aminatou, Veil Piercer
17%inclusion77 decks449 decks
16%synergy
Sage of Mysteries
17%inclusion77 decks449 decks
17%synergy
Mindwrack Harpy
16%inclusion72 decks449 decks
16%synergy
Archetype of Imagination
14%inclusion63 decks449 decks
9%synergy
Lotho, Corrupt Shirriff
14%inclusion61 decks449 decks
-3%synergy
Athreos, Shroud-Veiled
14%inclusion61 decks449 decks
9%synergy
Alseid of Life's Bounty
14%inclusion61 decks449 decks
12%synergy
Ancient Cellarspawn
13%inclusion60 decks449 decks
10%synergy
Balemurk Leech
13%inclusion58 decks449 decks
12%synergy
Hullbreaker Horror
12%inclusion56 decks449 decks
6%synergy
Hedron Crab
12%inclusion53 decks449 decks
11%synergy
Nashi, Searcher in the Dark
11%inclusion48 decks449 decks
10%synergy
Ledger Shredder
10%inclusion47 decks449 decks
2%synergy
Esper Sentinel
10%inclusion46 decks449 decks
-17%synergy
Skullsnap Nuisance
10%inclusion44 decks449 decks
9%synergy
Sun Titan
10%inclusion44 decks449 decks
1%synergy
Lurrus of the Dream-Den
9.4%inclusion42 decks449 decks
8%synergy
Witch Enchanter
9.4%inclusion42 decks449 decks
2%synergy
Gremlin Tamer
9.4%inclusion42 decks449 decks
8%synergy
Solemn Simulacrum
8.0%inclusion36 decks449 decks
-7%synergy
Spirited Companion
8.0%inclusion36 decks449 decks
6%synergy
Emet-Selch of the Third Seat
7.5%inclusion25 decks332 decks
-2%synergy
Valley Floodcaller
7.1%inclusion32 decks449 decks
3%synergy
Valgavoth, Terror Eater
6.9%inclusion31 decks449 decks
4%synergy
Auramancer
6.9%inclusion31 decks449 decks
4%synergy
Summon: Yojimbo
6.7%inclusion22 decks329 decks
6%synergy
Nightmare Shepherd
6.7%inclusion30 decks449 decks
4%synergy
Fear of Infinity
6.5%inclusion29 decks449 decks
6%synergy
Stenn, Paranoid Partisan
6.2%inclusion28 decks449 decks
5%synergy
Grand Abolisher
6.2%inclusion28 decks449 decks
-8%synergy
Starnheim Courser
6.0%inclusion27 decks449 decks
2%synergy
Metamorphosis Fanatic
6.0%inclusion27 decks449 decks
1%synergy
Laboratory Maniac
6.0%inclusion27 decks449 decks
3%synergy
Enduring Tenacity
5.6%inclusion25 decks449 decks
-2%synergy
Stitcher's Supplier
5.6%inclusion25 decks449 decks
5%synergy
Instants
Counterspell
34%inclusion152 decks449 decks
-7%synergy
Arcane Denial
33%inclusion150 decks449 decks
13%synergy
An Offer You Can't Refuse
29%inclusion129 decks449 decks
2%synergy
Path to Exile
27%inclusion119 decks449 decks
-16%synergy
Entomb
26%inclusion118 decks449 decks
19%synergy
Dark Ritual
26%inclusion118 decks449 decks
7%synergy
Void Rend
19%inclusion85 decks449 decks
-15%synergy
Inkshield
17%inclusion77 decks449 decks
8%synergy
Dovin's Veto
16%inclusion74 decks449 decks
-9%synergy
Thirst for Meaning
16%inclusion74 decks449 decks
15%synergy
Frantic Search
16%inclusion71 decks449 decks
-2%synergy
Swan Song
16%inclusion71 decks449 decks
-4%synergy
Sink into Stupor
14%inclusion65 decks449 decks
2%synergy
Negate
13%inclusion58 decks449 decks
-4%synergy
Otherworldly Gaze
13%inclusion58 decks449 decks
11%synergy
Mana Drain
12%inclusion53 decks449 decks
-6%synergy
Fell the Profane
12%inclusion52 decks449 decks
3%synergy
Brainstorm
11%inclusion48 decks449 decks
-6%synergy
Anguished Unmaking
9.1%inclusion41 decks449 decks
-16%synergy
Utter End
6.2%inclusion28 decks449 decks
-1%synergy
Faithful Mending
6.0%inclusion27 decks449 decks
2%synergy
Generous Gift
6.0%inclusion27 decks449 decks
-9%synergy
Fact or Fiction
6.0%inclusion27 decks449 decks
2%synergy
Return to Dust
5.3%inclusion24 decks449 decks
2%synergy
Waterlogged Teachings
5.3%inclusion24 decks449 decks
1%synergy
Cabal Ritual
5.1%inclusion23 decks449 decks
2%synergy
Sorceries
Sevinne's Reclamation
47%inclusion212 decks449 decks
38%synergy
Redress Fate
35%inclusion158 decks449 decks
29%synergy
Windfall
25%inclusion112 decks449 decks
11%synergy
Reanimate
22%inclusion101 decks449 decks
6%synergy
Singularity Rupture
21%inclusion61 decks284 decks
19%synergy
Extinguish All Hope
20%inclusion89 decks449 decks
18%synergy
Dance of the Manse
20%inclusion88 decks449 decks
16%synergy
Toxic Deluge
16%inclusion70 decks449 decks
-4%synergy
Time Wipe
15%inclusion68 decks449 decks
8%synergy
Glimpse the Unthinkable
14%inclusion64 decks449 decks
14%synergy
Damn
14%inclusion64 decks449 decks
-6%synergy
Idyllic Tutor
14%inclusion61 decks449 decks
9%synergy
Resurgent Belief
12%inclusion52 decks449 decks
9%synergy
Supreme Verdict
11%inclusion51 decks449 decks
-4%synergy
Demonic Counsel
11%inclusion48 decks449 decks
10%synergy
Buried Alive
9.4%inclusion42 decks449 decks
5%synergy
Space-Time Anomaly
9.3%inclusion26 decks279 decks
8%synergy
Replenish
8.5%inclusion38 decks449 decks
7%synergy
Unmarked Grave
7.8%inclusion35 decks449 decks
6%synergy
Ponder
7.1%inclusion32 decks449 decks
-2%synergy
Farewell
6.9%inclusion31 decks449 decks
-6%synergy
Lively Dirge
6.2%inclusion28 decks449 decks
5%synergy
Traumatize
5.1%inclusion23 decks449 decks
5%synergy
Utility Artifacts
Mesmeric Orb
18%inclusion79 decks449 decks
16%synergy
Cloud Key
12%inclusion55 decks449 decks
9%synergy
Lightning Greaves
8.7%inclusion39 decks449 decks
-14%synergy
Wayfarer's Bauble
7.6%inclusion34 decks449 decks
0%synergy
Keys to the House
5.3%inclusion24 decks449 decks
5%synergy
Swiftfoot Boots
5.1%inclusion23 decks449 decks
-19%synergy
Enchantments
Amphibian Downpour
46%inclusion207 decks449 decks
42%synergy
Propaganda
44%inclusion199 decks449 decks
17%synergy
Seal of Cleansing
43%inclusion191 decks449 decks
41%synergy
Grasp of Fate
42%inclusion190 decks449 decks
36%synergy
Cemetery Tampering
41%inclusion183 decks449 decks
40%synergy
Sigil of the Empty Throne
41%inclusion182 decks449 decks
35%synergy
Ghostly Prison
37%inclusion165 decks449 decks
15%synergy
Estrid's Invocation
35%inclusion159 decks449 decks
31%synergy
Blind Obedience
34%inclusion153 decks449 decks
22%synergy
Starfield of Nyx
33%inclusion149 decks449 decks
29%synergy
Cacophony Unleashed
33%inclusion148 decks449 decks
31%synergy
Monologue Tax
29%inclusion130 decks449 decks
23%synergy
Dance of the Dead
28%inclusion127 decks449 decks
26%synergy
The Tale of Tamiyo
26%inclusion118 decks449 decks
26%synergy
The Meathook Massacre
24%inclusion107 decks449 decks
20%synergy
Seal of Removal
24%inclusion106 decks449 decks
23%synergy
Darksteel Mutation
23%inclusion105 decks449 decks
17%synergy
Stillness in Motion
23%inclusion89 decks385 decks
23%synergy
Defiled Crypt // Cadaver Lab
22%inclusion101 decks449 decks
22%synergy
Phyrexian Arena
22%inclusion101 decks449 decks
8%synergy
Sheltered by Ghosts
22%inclusion100 decks449 decks
20%synergy
Timely Ward
22%inclusion99 decks449 decks
17%synergy
Extravagant Replication
21%inclusion96 decks449 decks
16%synergy
Black Market Connections
21%inclusion95 decks449 decks
7%synergy
Shark Typhoon
21%inclusion93 decks449 decks
15%synergy
All That Glitters
21%inclusion93 decks449 decks
12%synergy
Polluted Cistern // Dim Oubliette
21%inclusion93 decks449 decks
20%synergy
Out of the Tombs
20%inclusion92 decks449 decks
20%synergy
Imprisoned in the Moon
20%inclusion91 decks449 decks
14%synergy
Greater Auramancy
20%inclusion90 decks449 decks
16%synergy
Ethereal Armor
20%inclusion89 decks449 decks
15%synergy
Copy Enchantment
18%inclusion83 decks449 decks
14%synergy
Touch the Spirit Realm
18%inclusion79 decks449 decks
15%synergy
Authority of the Consuls
17%inclusion77 decks449 decks
5%synergy
Leyline of Anticipation
17%inclusion76 decks449 decks
12%synergy
Restricted Office // Lecture Hall
17%inclusion75 decks449 decks
15%synergy
The Eldest Reborn
16%inclusion74 decks449 decks
14%synergy
Mirror Room // Fractured Realm
16%inclusion74 decks449 decks
14%synergy
Bottomless Pool // Locker Room
16%inclusion74 decks449 decks
14%synergy
Hallowed Haunting
16%inclusion71 decks449 decks
13%synergy
Secrets of the Dead
15%inclusion67 decks449 decks
15%synergy
Central Elevator // Promising Stairs
15%inclusion66 decks449 decks
14%synergy
Static Prison
14%inclusion64 decks449 decks
14%synergy
Court of Cunning
14%inclusion63 decks449 decks
13%synergy
Teval's Judgment
14%inclusion54 decks391 decks
13%synergy
Nowhere to Run
14%inclusion62 decks449 decks
13%synergy
One with the Multiverse
14%inclusion61 decks449 decks
9%synergy
Land Tax
13%inclusion60 decks449 decks
7%synergy
Cramped Vents // Access Maze
13%inclusion59 decks449 decks
11%synergy
Oubliette
12%inclusion56 decks449 decks
11%synergy
Battles
Invasion of Theros
8.2%inclusion37 decks449 decks
6%synergy
Utility Lands
Hall of Heliod's Generosity
65%inclusion292 decks449 decks
52%synergy
Bojuka Bog
44%inclusion196 decks449 decks
16%synergy
Cephalid Coliseum
19%inclusion87 decks449 decks
16%synergy
Otawara, Soaring City
17%inclusion78 decks449 decks
-2%synergy
Takenuma, Abandoned Mire
16%inclusion70 decks449 decks
9%synergy
Reliquary Tower
12%inclusion55 decks449 decks
-22%synergy
Halimar Depths
10%inclusion45 decks449 decks
5%synergy
Urborg, Tomb of Yawgmoth
7.6%inclusion34 decks449 decks
-6%synergy
Urza's Saga
5.6%inclusion25 decks449 decks
-6%synergy
Rogue's Passage
5.3%inclusion24 decks449 decks
-4%synergy
Mana Artifacts
Arcane Signet
88%inclusion396 decks449 decks
0%synergy
Sol Ring
88%inclusion394 decks449 decks
-2%synergy
Talisman of Progress
51%inclusion228 decks449 decks
7%synergy
Talisman of Dominance
50%inclusion225 decks449 decks
1%synergy
Talisman of Hierarchy
45%inclusion204 decks449 decks
2%synergy
Azorius Signet
40%inclusion180 decks449 decks
8%synergy
Orzhov Signet
39%inclusion173 decks449 decks
5%synergy
Fellwar Stone
33%inclusion147 decks449 decks
-1%synergy
Dimir Signet
28%inclusion124 decks449 decks
-4%synergy
Mind Stone
15%inclusion67 decks449 decks
2%synergy
Commander's Sphere
13%inclusion57 decks449 decks
-6%synergy
Chromatic Lantern
6.9%inclusion31 decks449 decks
-6%synergy
Lands
Island
96%inclusion433 decks449 decks
4%synergy
Plains
96%inclusion432 decks449 decks
5%synergy
Swamp
96%inclusion432 decks449 decks
5%synergy
Command Tower
96%inclusion431 decks449 decks
3%synergy
Caves of Koilos
62%inclusion279 decks449 decks
27%synergy
Arcane Sanctum
61%inclusion275 decks449 decks
7%synergy
Adarkar Wastes
59%inclusion264 decks449 decks
28%synergy
Underground River
53%inclusion240 decks449 decks
20%synergy
Watery Grave
52%inclusion233 decks449 decks
2%synergy
Exotic Orchard
51%inclusion230 decks449 decks
-7%synergy
Godless Shrine
51%inclusion227 decks449 decks
0%synergy
Hallowed Fountain
49%inclusion221 decks449 decks
0%synergy
Flooded Strand
44%inclusion199 decks449 decks
6%synergy
Polluted Delta
43%inclusion194 decks449 decks
6%synergy
Raffine's Tower
43%inclusion193 decks449 decks
2%synergy
Glacial Fortress
40%inclusion181 decks449 decks
0%synergy
Isolated Chapel
39%inclusion176 decks449 decks
0%synergy
Marsh Flats
37%inclusion166 decks449 decks
1%synergy
Prairie Stream
34%inclusion154 decks449 decks
-6%synergy
Valgavoth's Lair
34%inclusion153 decks449 decks
31%synergy
Drowned Catacomb
34%inclusion151 decks449 decks
-3%synergy
Sunken Hollow
33%inclusion147 decks449 decks
-7%synergy
Meticulous Archive
32%inclusion144 decks449 decks
18%synergy
Sea of Clouds
31%inclusion139 decks449 decks
-5%synergy
Undercity Sewers
30%inclusion136 decks449 decks
16%synergy
Vault of Champions
30%inclusion135 decks449 decks
-3%synergy
Shadowy Backstreet
30%inclusion134 decks449 decks
17%synergy
Azorius Chancery
27%inclusion123 decks449 decks
13%synergy
Morphic Pool
27%inclusion121 decks449 decks
-7%synergy
Temple of Silence
27%inclusion119 decks449 decks
7%synergy
Terramorphic Expanse
26%inclusion117 decks449 decks
10%synergy
Floodfarm Verge
26%inclusion117 decks449 decks
15%synergy
Evolving Wilds
26%inclusion115 decks449 decks
1%synergy
Temple of Enlightenment
25%inclusion112 decks449 decks
8%synergy
Obscura Storefront
24%inclusion109 decks449 decks
14%synergy
Deserted Beach
24%inclusion107 decks449 decks
3%synergy
Orzhov Basilica
24%inclusion107 decks449 decks
8%synergy
Temple of Deceit
23%inclusion103 decks449 decks
5%synergy
Tainted Field
23%inclusion103 decks449 decks
16%synergy
Contaminated Landscape
23%inclusion102 decks449 decks
8%synergy
Dimir Aqueduct
23%inclusion102 decks449 decks
9%synergy
Gloomlake Verge
23%inclusion102 decks449 decks
12%synergy
Tainted Isle
21%inclusion93 decks449 decks
14%synergy
Shipwreck Marsh
20%inclusion92 decks449 decks
0%synergy
Ash Barrens
17%inclusion78 decks449 decks
7%synergy
Shattered Sanctum
16%inclusion73 decks449 decks
0%synergy
Path of Ancestry
16%inclusion72 decks449 decks
-11%synergy
Sink into Stupor
14%inclusion65 decks449 decks
2%synergy
Darkwater Catacombs
14%inclusion63 decks449 decks
0%synergy
Skycloud Expanse
13%inclusion59 decks449 decks
-2%synergy
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