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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Animate Dead
89%inclusion24 decks27 decks
79%synergy
Ripples of Undeath
78%inclusion21 decks27 decks
75%synergy
Necromancy
78%inclusion21 decks27 decks
73%synergy
Mystic Remora
93%inclusion25 decks27 decks
72%synergy
Dress Down
67%inclusion18 decks27 decks
64%synergy
Entity Tracker
70%inclusion19 decks27 decks
64%synergy
Amphibian Downpour
59%inclusion16 decks27 decks
55%synergy
Sevinne's Reclamation
63%inclusion17 decks27 decks
54%synergy
Abdel Adrian, Gorion's Ward
56%inclusion15 decks27 decks
54%synergy
Inquisitive Glimmer
59%inclusion16 decks27 decks
52%synergy
Top Cards
Swords to Plowshares
70%inclusion19 decks27 decks
2%synergy
An Offer You Can't Refuse
59%inclusion16 decks27 decks
32%synergy
Blind Obedience
56%inclusion15 decks27 decks
44%synergy
Entomb
52%inclusion14 decks27 decks
45%synergy
The Meathook Massacre
48%inclusion13 decks27 decks
45%synergy
Scrabbling Skullcrab
48%inclusion13 decks27 decks
47%synergy
Esper Sentinel
48%inclusion13 decks27 decks
21%synergy
Fear of Impostors
48%inclusion13 decks27 decks
47%synergy
Seal of Cleansing
48%inclusion13 decks27 decks
47%synergy
Mesmeric Orb
44%inclusion12 decks27 decks
43%synergy
Game Changers
Smothering Tithe
78%inclusion21 decks27 decks
47%synergy
Rhystic Study
70%inclusion19 decks27 decks
39%synergy
Enlightened Tutor
63%inclusion17 decks27 decks
44%synergy
Demonic Tutor
52%inclusion14 decks27 decks
31%synergy
Ancient Tomb
44%inclusion12 decks27 decks
32%synergy
Necropotence
41%inclusion11 decks27 decks
34%synergy
Fierce Guardianship
41%inclusion11 decks27 decks
20%synergy
Vampiric Tutor
41%inclusion11 decks27 decks
24%synergy
Thassa's Oracle
33%inclusion9 decks27 decks
24%synergy
Force of Will
33%inclusion9 decks27 decks
21%synergy
Creatures
Overlord of the Balemurk
44%inclusion12 decks27 decks
43%synergy
Ledger Shredder
44%inclusion12 decks27 decks
36%synergy
Lotho, Corrupt Shirriff
41%inclusion11 decks27 decks
24%synergy
Starfield Mystic
37%inclusion10 decks27 decks
30%synergy
Demon of Fate's Design
37%inclusion10 decks27 decks
32%synergy
Mesa Enchantress
37%inclusion10 decks27 decks
28%synergy
Gravebreaker Lamia
33%inclusion9 decks27 decks
32%synergy
Overlord of the Floodpits
33%inclusion9 decks27 decks
30%synergy
Zur, Eternal Schemer
33%inclusion9 decks27 decks
30%synergy
Victor, Valgavoth's Seneschal
30%inclusion8 decks27 decks
28%synergy
Orcish Bowmasters
30%inclusion8 decks27 decks
19%synergy
Displacer Kitten
26%inclusion7 decks27 decks
19%synergy
Hullbreaker Horror
26%inclusion7 decks27 decks
20%synergy
Valley Floodcaller
22%inclusion6 decks27 decks
18%synergy
Fear of Sleep Paralysis
22%inclusion6 decks27 decks
17%synergy
Faerie Mastermind
22%inclusion6 decks27 decks
13%synergy
Grand Abolisher
22%inclusion6 decks27 decks
8%synergy
Lurrus of the Dream-Den
19%inclusion5 decks27 decks
17%synergy
Enduring Curiosity
19%inclusion5 decks27 decks
11%synergy
Doomwake Giant
19%inclusion5 decks27 decks
13%synergy
Psychic Frog
19%inclusion5 decks27 decks
11%synergy
Ghostly Pilferer
19%inclusion5 decks27 decks
11%synergy
Wan Shi Tong, Librarian
17%inclusion2 decks12 decks
12%synergy
Opposition Agent
15%inclusion4 decks27 decks
7%synergy
Heliod, Sun-Crowned
15%inclusion4 decks27 decks
11%synergy
Hedron Crab
15%inclusion4 decks27 decks
14%synergy
Talion, the Kindly Lord
15%inclusion4 decks27 decks
7%synergy
Leonin Relic-Warder
15%inclusion4 decks27 decks
15%synergy
Aminatou, Veil Piercer
15%inclusion4 decks27 decks
13%synergy
Drannith Magistrate
15%inclusion4 decks27 decks
7%synergy
Ondu Spiritdancer
15%inclusion4 decks27 decks
9%synergy
Alseid of Life's Bounty
15%inclusion4 decks27 decks
13%synergy
Grim Guardian
15%inclusion4 decks27 decks
12%synergy
Heliod, the Radiant Dawn
15%inclusion4 decks27 decks
11%synergy
Witch Enchanter
11%inclusion3 decks27 decks
4%synergy
Hoarding Broodlord
11%inclusion3 decks27 decks
9%synergy
Archon of Sun's Grace
11%inclusion3 decks27 decks
7%synergy
Walking Ballista
11%inclusion3 decks27 decks
9%synergy
Silent Hallcreeper
11%inclusion3 decks27 decks
7%synergy
Laboratory Maniac
11%inclusion3 decks27 decks
8%synergy
Mockingbird
11%inclusion3 decks27 decks
7%synergy
Zur the Enchanter
11%inclusion3 decks27 decks
6%synergy
Dauthi Voidwalker
11%inclusion3 decks27 decks
5%synergy
Emet-Selch of the Third Seat
10%inclusion2 decks20 decks
1%synergy
Archivist of Oghma
7.4%inclusion2 decks27 decks
1%synergy
Sheoldred, the Apocalypse
7.4%inclusion2 decks27 decks
-1%synergy
High Fae Trickster
7.4%inclusion2 decks27 decks
3%synergy
Doom Whisperer
7.4%inclusion2 decks27 decks
6%synergy
Sage of Mysteries
7.4%inclusion2 decks27 decks
7%synergy
Hydroelectric Specimen
7.4%inclusion2 decks27 decks
5%synergy
Instants
Dovin's Veto
44%inclusion12 decks27 decks
19%synergy
Dark Ritual
44%inclusion12 decks27 decks
25%synergy
Swan Song
44%inclusion12 decks27 decks
25%synergy
Mana Drain
41%inclusion11 decks27 decks
23%synergy
Path to Exile
33%inclusion9 decks27 decks
-9%synergy
Cyclonic Rift
33%inclusion9 decks27 decks
10%synergy
Frantic Search
30%inclusion8 decks27 decks
12%synergy
Gifts Ungiven
26%inclusion7 decks27 decks
23%synergy
Force of Negation
26%inclusion7 decks27 decks
14%synergy
Sink into Stupor
26%inclusion7 decks27 decks
13%synergy
Mystical Tutor
26%inclusion7 decks27 decks
15%synergy
Arcane Denial
22%inclusion6 decks27 decks
2%synergy
Muddle the Mixture
19%inclusion5 decks27 decks
15%synergy
Teferi's Protection
19%inclusion5 decks27 decks
2%synergy
Intuition
19%inclusion5 decks27 decks
17%synergy
Cabal Ritual
19%inclusion5 decks27 decks
15%synergy
Silence
19%inclusion5 decks27 decks
8%synergy
Void Rend
19%inclusion5 decks27 decks
-16%synergy
Demonic Consultation
19%inclusion5 decks27 decks
11%synergy
Counterspell
19%inclusion5 decks27 decks
-23%synergy
Borne Upon a Wind
19%inclusion5 decks27 decks
14%synergy
Fell the Profane
15%inclusion4 decks27 decks
6%synergy
Tainted Pact
15%inclusion4 decks27 decks
8%synergy
Retraction Helix
15%inclusion4 decks27 decks
14%synergy
Brainstorm
15%inclusion4 decks27 decks
-2%synergy
Deadly Rollick
11%inclusion3 decks27 decks
-4%synergy
Sacrifice
11%inclusion3 decks27 decks
10%synergy
Mental Misstep
11%inclusion3 decks27 decks
5%synergy
Negate
11%inclusion3 decks27 decks
-5%synergy
Culling the Weak
11%inclusion3 decks27 decks
10%synergy
Flusterstorm
11%inclusion3 decks27 decks
3%synergy
Faithful Mending
11%inclusion3 decks27 decks
7%synergy
Generous Gift
11%inclusion3 decks27 decks
-3%synergy
Waterlogged Teachings
11%inclusion3 decks27 decks
7%synergy
Drown in the Loch
7.4%inclusion2 decks27 decks
5%synergy
Shred Memory
7.4%inclusion2 decks27 decks
7%synergy
Chain of Vapor
7.4%inclusion2 decks27 decks
4%synergy
Lim-Dûl's Vault
7.4%inclusion2 decks27 decks
4%synergy
Darkblast
7.4%inclusion2 decks27 decks
7%synergy
Angel's Grace
7.4%inclusion2 decks27 decks
5%synergy
Razorgrass Ambush
7.4%inclusion2 decks27 decks
6%synergy
Into the Flood Maw
7.4%inclusion2 decks27 decks
4%synergy
Banishing Knack
7.4%inclusion2 decks27 decks
7%synergy
Prismatic Strands
7.4%inclusion2 decks27 decks
7%synergy
Ad Nauseam
7.4%inclusion2 decks27 decks
5%synergy
Delay
7.4%inclusion2 decks27 decks
5%synergy
Mana Leak
7.4%inclusion2 decks27 decks
6%synergy
Anguished Unmaking
7.4%inclusion2 decks27 decks
-18%synergy
No More Lies
7.4%inclusion2 decks27 decks
6%synergy
Saw in Half
7.4%inclusion2 decks27 decks
5%synergy
Sorceries
Windfall
44%inclusion12 decks27 decks
31%synergy
Toxic Deluge
37%inclusion10 decks27 decks
17%synergy
Demonic Counsel
22%inclusion6 decks27 decks
21%synergy
Reanimate
22%inclusion6 decks27 decks
6%synergy
Supreme Verdict
15%inclusion4 decks27 decks
0%synergy
Lively Dirge
15%inclusion4 decks27 decks
14%synergy
Glimpse the Unthinkable
15%inclusion4 decks27 decks
14%synergy
Buried Alive
15%inclusion4 decks27 decks
11%synergy
Imperial Seal
11%inclusion3 decks27 decks
4%synergy
Yawgmoth's Will
11%inclusion3 decks27 decks
10%synergy
Damn
11%inclusion3 decks27 decks
-9%synergy
Grim Tutor
11%inclusion3 decks27 decks
7%synergy
Dance of the Manse
11%inclusion3 decks27 decks
8%synergy
Resurgent Belief
7.4%inclusion2 decks27 decks
5%synergy
Unmarked Grave
7.4%inclusion2 decks27 decks
6%synergy
Peer into the Abyss
7.4%inclusion2 decks27 decks
5%synergy
Replenish
7.4%inclusion2 decks27 decks
6%synergy
Idyllic Tutor
7.4%inclusion2 decks27 decks
3%synergy
Rite of Oblivion
7.4%inclusion2 decks27 decks
7%synergy
Mnemonic Betrayal
7.4%inclusion2 decks27 decks
5%synergy
Final Parting
7.4%inclusion2 decks27 decks
7%synergy
Extinguish All Hope
7.4%inclusion2 decks27 decks
6%synergy
Beseech the Mirror
7.4%inclusion2 decks27 decks
3%synergy
Traumatize
7.4%inclusion2 decks27 decks
7%synergy
Space-Time Anomaly
5.9%inclusion1 decks17 decks
4%synergy
Ultima
5.3%inclusion1 decks19 decks
5%synergy
Utility Artifacts
The One Ring
26%inclusion7 decks27 decks
13%synergy
Wishclaw Talisman
26%inclusion7 decks27 decks
18%synergy
Lightning Greaves
15%inclusion4 decks27 decks
-8%synergy
Cloud Key
7.4%inclusion2 decks27 decks
4%synergy
Isochron Scepter
7.4%inclusion2 decks27 decks
5%synergy
Enchantments
Grasp of Fate
44%inclusion12 decks27 decks
38%synergy
Dance of the Dead
44%inclusion12 decks27 decks
42%synergy
Ghostly Prison
44%inclusion12 decks27 decks
22%synergy
Touch the Spirit Realm
41%inclusion11 decks27 decks
38%synergy
Propaganda
37%inclusion10 decks27 decks
9%synergy
Tinybones Joins Up
33%inclusion9 decks27 decks
32%synergy
Mirrormade
30%inclusion8 decks27 decks
20%synergy
Land Tax
30%inclusion8 decks27 decks
24%synergy
Static Prison
30%inclusion8 decks27 decks
29%synergy
Secret Arcade // Dusty Parlor
30%inclusion8 decks27 decks
25%synergy
Authority of the Consuls
26%inclusion7 decks27 decks
13%synergy
Cemetery Tampering
26%inclusion7 decks27 decks
25%synergy
Sphere of Safety
26%inclusion7 decks27 decks
17%synergy
Seal of Removal
26%inclusion7 decks27 decks
25%synergy
Aura of Silence
26%inclusion7 decks27 decks
23%synergy
Out of the Tombs
22%inclusion6 decks27 decks
22%synergy
Starfield of Nyx
22%inclusion6 decks27 decks
18%synergy
The Tale of Tamiyo
22%inclusion6 decks27 decks
22%synergy
Sheltered by Ghosts
22%inclusion6 decks27 decks
20%synergy
Greater Auramancy
22%inclusion6 decks27 decks
18%synergy
Darksteel Mutation
19%inclusion5 decks27 decks
12%synergy
Chronic Flooding
19%inclusion5 decks27 decks
18%synergy
Black Market Connections
19%inclusion5 decks27 decks
4%synergy
Founding the Third Path
15%inclusion4 decks27 decks
15%synergy
Cacophony Unleashed
15%inclusion4 decks27 decks
13%synergy
Estrid's Invocation
15%inclusion4 decks27 decks
10%synergy
Out of Time
15%inclusion4 decks27 decks
14%synergy
Nowhere to Run
15%inclusion4 decks27 decks
14%synergy
Solitary Confinement
15%inclusion4 decks27 decks
13%synergy
Trouble in Pairs
15%inclusion4 decks27 decks
9%synergy
Standstill
15%inclusion4 decks27 decks
15%synergy
Parallax Wave
11%inclusion3 decks27 decks
11%synergy
Court of Cunning
11%inclusion3 decks27 decks
10%synergy
Attunement
11%inclusion3 decks27 decks
11%synergy
Copy Enchantment
11%inclusion3 decks27 decks
6%synergy
Exquisite Blood
11%inclusion3 decks27 decks
5%synergy
Karmic Justice
11%inclusion3 decks27 decks
9%synergy
All That Glitters
11%inclusion3 decks27 decks
2%synergy
Bloodchief Ascension
11%inclusion3 decks27 decks
5%synergy
Ethereal Armor
11%inclusion3 decks27 decks
6%synergy
Oubliette
11%inclusion3 decks27 decks
10%synergy
Dog Umbra
11%inclusion3 decks27 decks
11%synergy
Mornsong Aria
10%inclusion1 decks10 decks
9%synergy
Stillness in Motion
8.7%inclusion2 decks23 decks
8%synergy
Endless Evil
7.4%inclusion2 decks27 decks
7%synergy
Stony Silence
7.4%inclusion2 decks27 decks
7%synergy
Verity Circle
7.4%inclusion2 decks27 decks
7%synergy
Imprisoned in the Moon
7.4%inclusion2 decks27 decks
1%synergy
Glasswing Grace
7.4%inclusion2 decks27 decks
5%synergy
Sigil of the Empty Throne
7.4%inclusion2 decks27 decks
2%synergy
Planeswalkers
Teferi, Time Raveler
33%inclusion9 decks27 decks
25%synergy
Tezzeret, Cruel Captain
5.3%inclusion1 decks19 decks
3%synergy
Utility Lands
Hall of Heliod's Generosity
44%inclusion12 decks27 decks
31%synergy
Otawara, Soaring City
41%inclusion11 decks27 decks
22%synergy
Cephalid Coliseum
37%inclusion10 decks27 decks
33%synergy
Bojuka Bog
30%inclusion8 decks27 decks
3%synergy
Takenuma, Abandoned Mire
30%inclusion8 decks27 decks
23%synergy
Urza's Saga
22%inclusion6 decks27 decks
10%synergy
Serra's Sanctum
19%inclusion5 decks27 decks
17%synergy
Urborg, Tomb of Yawgmoth
15%inclusion4 decks27 decks
2%synergy
Emergence Zone
11%inclusion3 decks27 decks
9%synergy
Eiganjo, Seat of the Empire
11%inclusion3 decks27 decks
6%synergy
Volrath's Stronghold
11%inclusion3 decks27 decks
10%synergy
Mana Artifacts
Sol Ring
96%inclusion26 decks27 decks
6%synergy
Arcane Signet
81%inclusion22 decks27 decks
-6%synergy
Talisman of Dominance
78%inclusion21 decks27 decks
28%synergy
Talisman of Progress
74%inclusion20 decks27 decks
30%synergy
Talisman of Hierarchy
74%inclusion20 decks27 decks
30%synergy
Fellwar Stone
48%inclusion13 decks27 decks
15%synergy
Chrome Mox
30%inclusion8 decks27 decks
20%synergy
Mana Vault
26%inclusion7 decks27 decks
17%synergy
Lotus Petal
19%inclusion5 decks27 decks
8%synergy
Dimir Signet
19%inclusion5 decks27 decks
-12%synergy
Mox Opal
19%inclusion5 decks27 decks
10%synergy
Azorius Signet
19%inclusion5 decks27 decks
-12%synergy
Orzhov Signet
15%inclusion4 decks27 decks
-18%synergy
Mox Amber
11%inclusion3 decks27 decks
5%synergy
Hourglass of the Lost
7.4%inclusion2 decks27 decks
7%synergy
Lands
Command Tower
96%inclusion26 decks27 decks
4%synergy
Swamp
96%inclusion26 decks27 decks
5%synergy
Island
96%inclusion26 decks27 decks
3%synergy
Plains
96%inclusion26 decks27 decks
4%synergy
Watery Grave
93%inclusion25 decks27 decks
42%synergy
Godless Shrine
85%inclusion23 decks27 decks
34%synergy
Hallowed Fountain
85%inclusion23 decks27 decks
35%synergy
Polluted Delta
78%inclusion21 decks27 decks
40%synergy
Flooded Strand
74%inclusion20 decks27 decks
36%synergy
Marsh Flats
70%inclusion19 decks27 decks
34%synergy
Exotic Orchard
59%inclusion16 decks27 decks
1%synergy
Sea of Clouds
59%inclusion16 decks27 decks
24%synergy
Raffine's Tower
59%inclusion16 decks27 decks
18%synergy
Adarkar Wastes
59%inclusion16 decks27 decks
27%synergy
Caves of Koilos
56%inclusion15 decks27 decks
20%synergy
Morphic Pool
56%inclusion15 decks27 decks
22%synergy
Vault of Champions
52%inclusion14 decks27 decks
19%synergy
Underground River
48%inclusion13 decks27 decks
14%synergy
Shadowy Backstreet
44%inclusion12 decks27 decks
32%synergy
Undercity Sewers
41%inclusion11 decks27 decks
26%synergy
Glacial Fortress
37%inclusion10 decks27 decks
-5%synergy
Meticulous Archive
37%inclusion10 decks27 decks
23%synergy
Windswept Heath
33%inclusion9 decks27 decks
24%synergy
Verdant Catacombs
33%inclusion9 decks27 decks
23%synergy
Isolated Chapel
33%inclusion9 decks27 decks
-7%synergy
Gloomlake Verge
33%inclusion9 decks27 decks
22%synergy
Bloodstained Mire
33%inclusion9 decks27 decks
23%synergy
Valgavoth's Lair
30%inclusion8 decks27 decks
27%synergy
Reflecting Pool
30%inclusion8 decks27 decks
22%synergy
Arid Mesa
30%inclusion8 decks27 decks
20%synergy
Mana Confluence
30%inclusion8 decks27 decks
16%synergy
City of Brass
30%inclusion8 decks27 decks
15%synergy
Misty Rainforest
26%inclusion7 decks27 decks
15%synergy
Drowned Catacomb
26%inclusion7 decks27 decks
-11%synergy
Sink into Stupor
26%inclusion7 decks27 decks
13%synergy
Floodfarm Verge
26%inclusion7 decks27 decks
15%synergy
Tundra
22%inclusion6 decks27 decks
6%synergy
Fabled Passage
22%inclusion6 decks27 decks
15%synergy
Brightclimb Pathway
22%inclusion6 decks27 decks
16%synergy
Arcane Sanctum
22%inclusion6 decks27 decks
-32%synergy
Scalding Tarn
22%inclusion6 decks27 decks
11%synergy
Clearwater Pathway
19%inclusion5 decks27 decks
12%synergy
Bleachbone Verge
19%inclusion5 decks27 decks
10%synergy
Underground Sea
19%inclusion5 decks27 decks
3%synergy
Prairie Stream
19%inclusion5 decks27 decks
-22%synergy
Skycloud Expanse
19%inclusion5 decks27 decks
4%synergy
Scrubland
19%inclusion5 decks27 decks
3%synergy
Deserted Beach
19%inclusion5 decks27 decks
-2%synergy
Prismatic Vista
15%inclusion4 decks27 decks
11%synergy
Fell the Profane
15%inclusion4 decks27 decks
6%synergy
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