The Master of Keys (Commander) - Optimized Control

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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Mornsong Aria
11%inclusion1 decks9 decks
10%synergy
High Synergy Cards
Animate Dead
88%inclusion23 decks26 decks
79%synergy
Ripples of Undeath
81%inclusion21 decks26 decks
78%synergy
Necromancy
77%inclusion20 decks26 decks
72%synergy
Mystic Remora
92%inclusion24 decks26 decks
71%synergy
Dress Down
65%inclusion17 decks26 decks
63%synergy
Entity Tracker
69%inclusion18 decks26 decks
63%synergy
Amphibian Downpour
62%inclusion16 decks26 decks
57%synergy
Abdel Adrian, Gorion's Ward
58%inclusion15 decks26 decks
56%synergy
Sevinne's Reclamation
62%inclusion16 decks26 decks
53%synergy
Inquisitive Glimmer
58%inclusion15 decks26 decks
50%synergy
Top Cards
Swords to Plowshares
69%inclusion18 decks26 decks
1%synergy
An Offer You Can't Refuse
62%inclusion16 decks26 decks
34%synergy
Blind Obedience
58%inclusion15 decks26 decks
46%synergy
Entomb
54%inclusion14 decks26 decks
47%synergy
The Meathook Massacre
46%inclusion12 decks26 decks
43%synergy
Scrabbling Skullcrab
46%inclusion12 decks26 decks
45%synergy
Dark Ritual
46%inclusion12 decks26 decks
27%synergy
Esper Sentinel
46%inclusion12 decks26 decks
19%synergy
Fear of Impostors
46%inclusion12 decks26 decks
45%synergy
Swan Song
46%inclusion12 decks26 decks
26%synergy
Game Changers
Smothering Tithe
77%inclusion20 decks26 decks
46%synergy
Rhystic Study
69%inclusion18 decks26 decks
38%synergy
Enlightened Tutor
62%inclusion16 decks26 decks
42%synergy
Demonic Tutor
50%inclusion13 decks26 decks
29%synergy
Ancient Tomb
46%inclusion12 decks26 decks
33%synergy
Necropotence
42%inclusion11 decks26 decks
36%synergy
Fierce Guardianship
42%inclusion11 decks26 decks
22%synergy
Vampiric Tutor
42%inclusion11 decks26 decks
25%synergy
Thassa's Oracle
35%inclusion9 decks26 decks
25%synergy
Force of Will
35%inclusion9 decks26 decks
22%synergy
Creatures
Ledger Shredder
46%inclusion12 decks26 decks
37%synergy
Lotho, Corrupt Shirriff
42%inclusion11 decks26 decks
25%synergy
Overlord of the Balemurk
42%inclusion11 decks26 decks
40%synergy
Starfield Mystic
35%inclusion9 decks26 decks
28%synergy
Demon of Fate's Design
35%inclusion9 decks26 decks
29%synergy
Mesa Enchantress
35%inclusion9 decks26 decks
26%synergy
Zur, Eternal Schemer
35%inclusion9 decks26 decks
31%synergy
Gravebreaker Lamia
31%inclusion8 decks26 decks
30%synergy
Overlord of the Floodpits
31%inclusion8 decks26 decks
27%synergy
Victor, Valgavoth's Seneschal
31%inclusion8 decks26 decks
29%synergy
Orcish Bowmasters
31%inclusion8 decks26 decks
20%synergy
Displacer Kitten
27%inclusion7 decks26 decks
20%synergy
Hullbreaker Horror
27%inclusion7 decks26 decks
21%synergy
Valley Floodcaller
23%inclusion6 decks26 decks
19%synergy
Faerie Mastermind
23%inclusion6 decks26 decks
14%synergy
Grand Abolisher
23%inclusion6 decks26 decks
9%synergy
Lurrus of the Dream-Den
19%inclusion5 decks26 decks
18%synergy
Fear of Sleep Paralysis
19%inclusion5 decks26 decks
14%synergy
Psychic Frog
19%inclusion5 decks26 decks
12%synergy
Ghostly Pilferer
19%inclusion5 decks26 decks
12%synergy
Wan Shi Tong, Librarian
18%inclusion2 decks11 decks
13%synergy
Opposition Agent
15%inclusion4 decks26 decks
7%synergy
Heliod, Sun-Crowned
15%inclusion4 decks26 decks
12%synergy
Hedron Crab
15%inclusion4 decks26 decks
15%synergy
Leonin Relic-Warder
15%inclusion4 decks26 decks
15%synergy
Enduring Curiosity
15%inclusion4 decks26 decks
7%synergy
Talion, the Kindly Lord
15%inclusion4 decks26 decks
8%synergy
Drannith Magistrate
15%inclusion4 decks26 decks
8%synergy
Doomwake Giant
15%inclusion4 decks26 decks
10%synergy
Aminatou, Veil Piercer
15%inclusion4 decks26 decks
14%synergy
Heliod, the Radiant Dawn
15%inclusion4 decks26 decks
12%synergy
Alseid of Life's Bounty
15%inclusion4 decks26 decks
14%synergy
Witch Enchanter
12%inclusion3 decks26 decks
5%synergy
Hoarding Broodlord
12%inclusion3 decks26 decks
10%synergy
Archon of Sun's Grace
12%inclusion3 decks26 decks
7%synergy
Walking Ballista
12%inclusion3 decks26 decks
9%synergy
Silent Hallcreeper
12%inclusion3 decks26 decks
7%synergy
Laboratory Maniac
12%inclusion3 decks26 decks
8%synergy
Mockingbird
12%inclusion3 decks26 decks
7%synergy
Grim Guardian
12%inclusion3 decks26 decks
9%synergy
Ondu Spiritdancer
12%inclusion3 decks26 decks
5%synergy
Zur the Enchanter
12%inclusion3 decks26 decks
6%synergy
Dauthi Voidwalker
12%inclusion3 decks26 decks
6%synergy
Emet-Selch of the Third Seat
11%inclusion2 decks19 decks
1%synergy
Archivist of Oghma
7.7%inclusion2 decks26 decks
1%synergy
High Fae Trickster
7.7%inclusion2 decks26 decks
3%synergy
Sheoldred, the Apocalypse
7.7%inclusion2 decks26 decks
-1%synergy
Doom Whisperer
7.7%inclusion2 decks26 decks
6%synergy
Hydroelectric Specimen
7.7%inclusion2 decks26 decks
5%synergy
Sage of Mysteries
7.7%inclusion2 decks26 decks
7%synergy
Instants
Dovin's Veto
42%inclusion11 decks26 decks
17%synergy
Mana Drain
42%inclusion11 decks26 decks
25%synergy
Path to Exile
35%inclusion9 decks26 decks
-8%synergy
Cyclonic Rift
35%inclusion9 decks26 decks
11%synergy
Frantic Search
31%inclusion8 decks26 decks
13%synergy
Gifts Ungiven
27%inclusion7 decks26 decks
24%synergy
Force of Negation
27%inclusion7 decks26 decks
15%synergy
Sink into Stupor
27%inclusion7 decks26 decks
14%synergy
Mystical Tutor
27%inclusion7 decks26 decks
16%synergy
Muddle the Mixture
19%inclusion5 decks26 decks
15%synergy
Teferi's Protection
19%inclusion5 decks26 decks
3%synergy
Intuition
19%inclusion5 decks26 decks
18%synergy
Cabal Ritual
19%inclusion5 decks26 decks
16%synergy
Void Rend
19%inclusion5 decks26 decks
-15%synergy
Silence
19%inclusion5 decks26 decks
9%synergy
Demonic Consultation
19%inclusion5 decks26 decks
11%synergy
Arcane Denial
19%inclusion5 decks26 decks
-1%synergy
Borne Upon a Wind
19%inclusion5 decks26 decks
14%synergy
Fell the Profane
15%inclusion4 decks26 decks
7%synergy
Tainted Pact
15%inclusion4 decks26 decks
8%synergy
Retraction Helix
15%inclusion4 decks26 decks
15%synergy
Brainstorm
15%inclusion4 decks26 decks
-2%synergy
Counterspell
15%inclusion4 decks26 decks
-26%synergy
Deadly Rollick
12%inclusion3 decks26 decks
-3%synergy
Sacrifice
12%inclusion3 decks26 decks
11%synergy
Mental Misstep
12%inclusion3 decks26 decks
5%synergy
Negate
12%inclusion3 decks26 decks
-5%synergy
Culling the Weak
12%inclusion3 decks26 decks
10%synergy
Flusterstorm
12%inclusion3 decks26 decks
4%synergy
Faithful Mending
12%inclusion3 decks26 decks
8%synergy
Waterlogged Teachings
12%inclusion3 decks26 decks
7%synergy
Generous Gift
12%inclusion3 decks26 decks
-3%synergy
Drown in the Loch
7.7%inclusion2 decks26 decks
6%synergy
Shred Memory
7.7%inclusion2 decks26 decks
7%synergy
Chain of Vapor
7.7%inclusion2 decks26 decks
4%synergy
Lim-Dûl's Vault
7.7%inclusion2 decks26 decks
4%synergy
Razorgrass Ambush
7.7%inclusion2 decks26 decks
7%synergy
Darkblast
7.7%inclusion2 decks26 decks
8%synergy
Angel's Grace
7.7%inclusion2 decks26 decks
5%synergy
Banishing Knack
7.7%inclusion2 decks26 decks
7%synergy
Into the Flood Maw
7.7%inclusion2 decks26 decks
4%synergy
Prismatic Strands
7.7%inclusion2 decks26 decks
8%synergy
Ad Nauseam
7.7%inclusion2 decks26 decks
5%synergy
Delay
7.7%inclusion2 decks26 decks
6%synergy
Mana Leak
7.7%inclusion2 decks26 decks
6%synergy
No More Lies
7.7%inclusion2 decks26 decks
6%synergy
Saw in Half
7.7%inclusion2 decks26 decks
6%synergy
Sorceries
Windfall
42%inclusion11 decks26 decks
29%synergy
Toxic Deluge
38%inclusion10 decks26 decks
19%synergy
Demonic Counsel
23%inclusion6 decks26 decks
22%synergy
Reanimate
23%inclusion6 decks26 decks
7%synergy
Supreme Verdict
15%inclusion4 decks26 decks
1%synergy
Lively Dirge
15%inclusion4 decks26 decks
14%synergy
Glimpse the Unthinkable
15%inclusion4 decks26 decks
15%synergy
Buried Alive
15%inclusion4 decks26 decks
11%synergy
Imperial Seal
12%inclusion3 decks26 decks
4%synergy
Yawgmoth's Will
12%inclusion3 decks26 decks
10%synergy
Damn
12%inclusion3 decks26 decks
-9%synergy
Grim Tutor
12%inclusion3 decks26 decks
7%synergy
Unmarked Grave
7.7%inclusion2 decks26 decks
6%synergy
Peer into the Abyss
7.7%inclusion2 decks26 decks
5%synergy
Idyllic Tutor
7.7%inclusion2 decks26 decks
3%synergy
Rite of Oblivion
7.7%inclusion2 decks26 decks
7%synergy
Final Parting
7.7%inclusion2 decks26 decks
7%synergy
Mnemonic Betrayal
7.7%inclusion2 decks26 decks
5%synergy
Extinguish All Hope
7.7%inclusion2 decks26 decks
6%synergy
Beseech the Mirror
7.7%inclusion2 decks26 decks
4%synergy
Traumatize
7.7%inclusion2 decks26 decks
7%synergy
Dance of the Manse
7.7%inclusion2 decks26 decks
4%synergy
Space-Time Anomaly
6.3%inclusion1 decks16 decks
5%synergy
Ultima
5.6%inclusion1 decks18 decks
5%synergy
Utility Artifacts
Mesmeric Orb
42%inclusion11 decks26 decks
41%synergy
The One Ring
27%inclusion7 decks26 decks
14%synergy
Wishclaw Talisman
27%inclusion7 decks26 decks
19%synergy
Lightning Greaves
12%inclusion3 decks26 decks
-11%synergy
Isochron Scepter
7.7%inclusion2 decks26 decks
6%synergy
Enchantments
Seal of Cleansing
46%inclusion12 decks26 decks
45%synergy
Ghostly Prison
46%inclusion12 decks26 decks
24%synergy
Dance of the Dead
42%inclusion11 decks26 decks
40%synergy
Grasp of Fate
42%inclusion11 decks26 decks
36%synergy
Touch the Spirit Realm
42%inclusion11 decks26 decks
40%synergy
Tinybones Joins Up
35%inclusion9 decks26 decks
33%synergy
Propaganda
35%inclusion9 decks26 decks
7%synergy
Mirrormade
31%inclusion8 decks26 decks
21%synergy
Static Prison
31%inclusion8 decks26 decks
30%synergy
Authority of the Consuls
27%inclusion7 decks26 decks
15%synergy
Sphere of Safety
27%inclusion7 decks26 decks
17%synergy
Cemetery Tampering
27%inclusion7 decks26 decks
26%synergy
Secret Arcade // Dusty Parlor
27%inclusion7 decks26 decks
22%synergy
Land Tax
27%inclusion7 decks26 decks
21%synergy
Aura of Silence
27%inclusion7 decks26 decks
24%synergy
Out of the Tombs
23%inclusion6 decks26 decks
23%synergy
Starfield of Nyx
23%inclusion6 decks26 decks
19%synergy
Sheltered by Ghosts
23%inclusion6 decks26 decks
21%synergy
Greater Auramancy
23%inclusion6 decks26 decks
19%synergy
Seal of Removal
23%inclusion6 decks26 decks
22%synergy
Darksteel Mutation
19%inclusion5 decks26 decks
13%synergy
Chronic Flooding
19%inclusion5 decks26 decks
19%synergy
The Tale of Tamiyo
19%inclusion5 decks26 decks
19%synergy
Black Market Connections
19%inclusion5 decks26 decks
5%synergy
Founding the Third Path
15%inclusion4 decks26 decks
15%synergy
Cacophony Unleashed
15%inclusion4 decks26 decks
14%synergy
Estrid's Invocation
15%inclusion4 decks26 decks
11%synergy
Out of Time
15%inclusion4 decks26 decks
14%synergy
Solitary Confinement
15%inclusion4 decks26 decks
13%synergy
Trouble in Pairs
15%inclusion4 decks26 decks
10%synergy
Standstill
15%inclusion4 decks26 decks
15%synergy
Parallax Wave
12%inclusion3 decks26 decks
11%synergy
Court of Cunning
12%inclusion3 decks26 decks
11%synergy
Attunement
12%inclusion3 decks26 decks
11%synergy
Exquisite Blood
12%inclusion3 decks26 decks
5%synergy
Karmic Justice
12%inclusion3 decks26 decks
9%synergy
All That Glitters
12%inclusion3 decks26 decks
3%synergy
Bloodchief Ascension
12%inclusion3 decks26 decks
6%synergy
Nowhere to Run
12%inclusion3 decks26 decks
10%synergy
Ethereal Armor
12%inclusion3 decks26 decks
7%synergy
Dog Umbra
12%inclusion3 decks26 decks
11%synergy
Stillness in Motion
9.1%inclusion2 decks22 decks
9%synergy
Endless Evil
7.7%inclusion2 decks26 decks
7%synergy
Stony Silence
7.7%inclusion2 decks26 decks
7%synergy
Verity Circle
7.7%inclusion2 decks26 decks
7%synergy
Imprisoned in the Moon
7.7%inclusion2 decks26 decks
1%synergy
Glasswing Grace
7.7%inclusion2 decks26 decks
5%synergy
Sigil of the Empty Throne
7.7%inclusion2 decks26 decks
2%synergy
Unable to Scream
7.7%inclusion2 decks26 decks
7%synergy
Opalescence
7.7%inclusion2 decks26 decks
7%synergy
Planeswalkers
Teferi, Time Raveler
35%inclusion9 decks26 decks
26%synergy
Tezzeret, Cruel Captain
5.6%inclusion1 decks18 decks
4%synergy
Utility Lands
Hall of Heliod's Generosity
42%inclusion11 decks26 decks
29%synergy
Otawara, Soaring City
42%inclusion11 decks26 decks
23%synergy
Cephalid Coliseum
38%inclusion10 decks26 decks
35%synergy
Bojuka Bog
31%inclusion8 decks26 decks
4%synergy
Takenuma, Abandoned Mire
31%inclusion8 decks26 decks
24%synergy
Urza's Saga
23%inclusion6 decks26 decks
11%synergy
Serra's Sanctum
19%inclusion5 decks26 decks
17%synergy
Urborg, Tomb of Yawgmoth
15%inclusion4 decks26 decks
2%synergy
Volrath's Stronghold
12%inclusion3 decks26 decks
11%synergy
Emergence Zone
12%inclusion3 decks26 decks
9%synergy
Eiganjo, Seat of the Empire
12%inclusion3 decks26 decks
6%synergy
Mana Artifacts
Sol Ring
96%inclusion25 decks26 decks
6%synergy
Arcane Signet
81%inclusion21 decks26 decks
-7%synergy
Talisman of Dominance
77%inclusion20 decks26 decks
27%synergy
Talisman of Progress
73%inclusion19 decks26 decks
29%synergy
Talisman of Hierarchy
73%inclusion19 decks26 decks
29%synergy
Fellwar Stone
46%inclusion12 decks26 decks
13%synergy
Chrome Mox
31%inclusion8 decks26 decks
21%synergy
Mana Vault
27%inclusion7 decks26 decks
18%synergy
Lotus Petal
19%inclusion5 decks26 decks
9%synergy
Dimir Signet
19%inclusion5 decks26 decks
-12%synergy
Mox Opal
19%inclusion5 decks26 decks
11%synergy
Azorius Signet
19%inclusion5 decks26 decks
-12%synergy
Orzhov Signet
15%inclusion4 decks26 decks
-18%synergy
Mox Amber
12%inclusion3 decks26 decks
5%synergy
Hourglass of the Lost
7.7%inclusion2 decks26 decks
7%synergy
Lands
Command Tower
96%inclusion25 decks26 decks
4%synergy
Swamp
96%inclusion25 decks26 decks
5%synergy
Island
96%inclusion25 decks26 decks
3%synergy
Plains
96%inclusion25 decks26 decks
4%synergy
Watery Grave
92%inclusion24 decks26 decks
42%synergy
Godless Shrine
85%inclusion22 decks26 decks
34%synergy
Hallowed Fountain
85%inclusion22 decks26 decks
35%synergy
Polluted Delta
77%inclusion20 decks26 decks
39%synergy
Flooded Strand
73%inclusion19 decks26 decks
35%synergy
Marsh Flats
69%inclusion18 decks26 decks
33%synergy
Exotic Orchard
62%inclusion16 decks26 decks
3%synergy
Adarkar Wastes
62%inclusion16 decks26 decks
30%synergy
Caves of Koilos
58%inclusion15 decks26 decks
22%synergy
Sea of Clouds
58%inclusion15 decks26 decks
22%synergy
Raffine's Tower
58%inclusion15 decks26 decks
17%synergy
Morphic Pool
54%inclusion14 decks26 decks
20%synergy
Underground River
50%inclusion13 decks26 decks
16%synergy
Vault of Champions
50%inclusion13 decks26 decks
17%synergy
Shadowy Backstreet
46%inclusion12 decks26 decks
34%synergy
Undercity Sewers
42%inclusion11 decks26 decks
28%synergy
Meticulous Archive
38%inclusion10 decks26 decks
25%synergy
Glacial Fortress
35%inclusion9 decks26 decks
-7%synergy
Windswept Heath
35%inclusion9 decks26 decks
25%synergy
Verdant Catacombs
35%inclusion9 decks26 decks
25%synergy
Bloodstained Mire
35%inclusion9 decks26 decks
24%synergy
Isolated Chapel
31%inclusion8 decks26 decks
-10%synergy
Arid Mesa
31%inclusion8 decks26 decks
21%synergy
Gloomlake Verge
31%inclusion8 decks26 decks
20%synergy
Misty Rainforest
27%inclusion7 decks26 decks
16%synergy
Valgavoth's Lair
27%inclusion7 decks26 decks
24%synergy
Reflecting Pool
27%inclusion7 decks26 decks
19%synergy
Drowned Catacomb
27%inclusion7 decks26 decks
-10%synergy
Sink into Stupor
27%inclusion7 decks26 decks
14%synergy
Mana Confluence
27%inclusion7 decks26 decks
13%synergy
City of Brass
27%inclusion7 decks26 decks
12%synergy
Tundra
23%inclusion6 decks26 decks
7%synergy
Brightclimb Pathway
23%inclusion6 decks26 decks
16%synergy
Arcane Sanctum
23%inclusion6 decks26 decks
-31%synergy
Scalding Tarn
23%inclusion6 decks26 decks
12%synergy
Floodfarm Verge
23%inclusion6 decks26 decks
12%synergy
Fabled Passage
19%inclusion5 decks26 decks
12%synergy
Clearwater Pathway
19%inclusion5 decks26 decks
13%synergy
Underground Sea
19%inclusion5 decks26 decks
4%synergy
Prairie Stream
19%inclusion5 decks26 decks
-21%synergy
Skycloud Expanse
19%inclusion5 decks26 decks
4%synergy
Scrubland
19%inclusion5 decks26 decks
3%synergy
Prismatic Vista
15%inclusion4 decks26 decks
11%synergy
Fell the Profane
15%inclusion4 decks26 decks
7%synergy
Contaminated Landscape
15%inclusion4 decks26 decks
1%synergy
Bleachbone Verge
15%inclusion4 decks26 decks
7%synergy
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