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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Utility Lands
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Ripples of Undeath
88%inclusion21 decks24 decks
85%synergy
Animate Dead
92%inclusion22 decks24 decks
82%synergy
Mystic Remora
96%inclusion23 decks24 decks
75%synergy
Necromancy
79%inclusion19 decks24 decks
75%synergy
Entity Tracker
79%inclusion19 decks24 decks
73%synergy
Dress Down
71%inclusion17 decks24 decks
68%synergy
Amphibian Downpour
71%inclusion17 decks24 decks
66%synergy
Sevinne's Reclamation
71%inclusion17 decks24 decks
62%synergy
Abdel Adrian, Gorion's Ward
63%inclusion15 decks24 decks
61%synergy
Blind Obedience
63%inclusion15 decks24 decks
50%synergy
Top Cards
Swords to Plowshares
71%inclusion17 decks24 decks
3%synergy
An Offer You Can't Refuse
63%inclusion15 decks24 decks
36%synergy
Inquisitive Glimmer
54%inclusion13 decks24 decks
47%synergy
The Meathook Massacre
50%inclusion12 decks24 decks
47%synergy
Dark Ritual
50%inclusion12 decks24 decks
31%synergy
Fear of Impostors
50%inclusion12 decks24 decks
49%synergy
Swan Song
50%inclusion12 decks24 decks
30%synergy
Seal of Cleansing
50%inclusion12 decks24 decks
49%synergy
Ledger Shredder
50%inclusion12 decks24 decks
41%synergy
Windfall
46%inclusion11 decks24 decks
32%synergy
Game Changers
Smothering Tithe
79%inclusion19 decks24 decks
47%synergy
Rhystic Study
71%inclusion17 decks24 decks
39%synergy
Enlightened Tutor
63%inclusion15 decks24 decks
43%synergy
Demonic Tutor
54%inclusion13 decks24 decks
33%synergy
Ancient Tomb
50%inclusion12 decks24 decks
37%synergy
Vampiric Tutor
46%inclusion11 decks24 decks
28%synergy
Force of Will
38%inclusion9 decks24 decks
25%synergy
Fierce Guardianship
38%inclusion9 decks24 decks
17%synergy
Gifts Ungiven
33%inclusion8 decks24 decks
31%synergy
Necropotence
33%inclusion8 decks24 decks
27%synergy
Creatures
Scrabbling Skullcrab
46%inclusion11 decks24 decks
45%synergy
Esper Sentinel
46%inclusion11 decks24 decks
18%synergy
Lotho, Corrupt Shirriff
42%inclusion10 decks24 decks
25%synergy
Overlord of the Balemurk
38%inclusion9 decks24 decks
36%synergy
Starfield Mystic
33%inclusion8 decks24 decks
27%synergy
Mesa Enchantress
33%inclusion8 decks24 decks
24%synergy
Victor, Valgavoth's Seneschal
33%inclusion8 decks24 decks
31%synergy
Orcish Bowmasters
33%inclusion8 decks24 decks
22%synergy
Thassa's Oracle
29%inclusion7 decks24 decks
20%synergy
Gravebreaker Lamia
29%inclusion7 decks24 decks
28%synergy
Demon of Fate's Design
29%inclusion7 decks24 decks
24%synergy
Zur, Eternal Schemer
29%inclusion7 decks24 decks
26%synergy
Overlord of the Floodpits
25%inclusion6 decks24 decks
21%synergy
Faerie Mastermind
25%inclusion6 decks24 decks
15%synergy
Displacer Kitten
21%inclusion5 decks24 decks
14%synergy
Valley Floodcaller
21%inclusion5 decks24 decks
17%synergy
Grand Abolisher
21%inclusion5 decks24 decks
6%synergy
Hullbreaker Horror
21%inclusion5 decks24 decks
15%synergy
Ghostly Pilferer
21%inclusion5 decks24 decks
14%synergy
Opposition Agent
17%inclusion4 decks24 decks
8%synergy
Lurrus of the Dream-Den
17%inclusion4 decks24 decks
15%synergy
Heliod, Sun-Crowned
17%inclusion4 decks24 decks
13%synergy
Leonin Relic-Warder
17%inclusion4 decks24 decks
16%synergy
Talion, the Kindly Lord
17%inclusion4 decks24 decks
9%synergy
Laboratory Maniac
17%inclusion4 decks24 decks
13%synergy
Psychic Frog
17%inclusion4 decks24 decks
10%synergy
Witch Enchanter
13%inclusion3 decks24 decks
6%synergy
Archon of Sun's Grace
13%inclusion3 decks24 decks
8%synergy
Walking Ballista
13%inclusion3 decks24 decks
10%synergy
Hedron Crab
13%inclusion3 decks24 decks
12%synergy
Enduring Curiosity
13%inclusion3 decks24 decks
5%synergy
Fear of Sleep Paralysis
13%inclusion3 decks24 decks
7%synergy
Warehouse Tabby
13%inclusion3 decks24 decks
12%synergy
Drannith Magistrate
13%inclusion3 decks24 decks
4%synergy
Mockingbird
13%inclusion3 decks24 decks
8%synergy
Doomwake Giant
13%inclusion3 decks24 decks
7%synergy
Aminatou, Veil Piercer
13%inclusion3 decks24 decks
11%synergy
Grim Guardian
13%inclusion3 decks24 decks
10%synergy
Heliod, the Radiant Dawn
13%inclusion3 decks24 decks
9%synergy
Ondu Spiritdancer
13%inclusion3 decks24 decks
6%synergy
Alseid of Life's Bounty
13%inclusion3 decks24 decks
11%synergy
Dauthi Voidwalker
13%inclusion3 decks24 decks
6%synergy
Wan Shi Tong, Librarian
13%inclusion1 decks8 decks
7%synergy
Emet-Selch of the Third Seat
12%inclusion2 decks17 decks
2%synergy
Hoarding Broodlord
8.3%inclusion2 decks24 decks
6%synergy
Doom Whisperer
8.3%inclusion2 decks24 decks
7%synergy
Hydroelectric Specimen
8.3%inclusion2 decks24 decks
6%synergy
Silent Hallcreeper
8.3%inclusion2 decks24 decks
4%synergy
Stitcher's Supplier
8.3%inclusion2 decks24 decks
8%synergy
Enduring Tenacity
8.3%inclusion2 decks24 decks
1%synergy
Instants
Entomb
46%inclusion11 decks24 decks
39%synergy
Dovin's Veto
42%inclusion10 decks24 decks
16%synergy
Path to Exile
38%inclusion9 decks24 decks
-5%synergy
Mana Drain
33%inclusion8 decks24 decks
16%synergy
Cyclonic Rift
33%inclusion8 decks24 decks
9%synergy
Mystical Tutor
33%inclusion8 decks24 decks
22%synergy
Frantic Search
29%inclusion7 decks24 decks
12%synergy
Sink into Stupor
29%inclusion7 decks24 decks
16%synergy
Muddle the Mixture
25%inclusion6 decks24 decks
21%synergy
Arcane Denial
25%inclusion6 decks24 decks
5%synergy
Force of Negation
25%inclusion6 decks24 decks
13%synergy
Retraction Helix
21%inclusion5 decks24 decks
20%synergy
Intuition
21%inclusion5 decks24 decks
19%synergy
Fell the Profane
17%inclusion4 decks24 decks
8%synergy
Teferi's Protection
17%inclusion4 decks24 decks
0%synergy
Tainted Pact
17%inclusion4 decks24 decks
9%synergy
Negate
17%inclusion4 decks24 decks
0%synergy
Brainstorm
17%inclusion4 decks24 decks
0%synergy
Cabal Ritual
17%inclusion4 decks24 decks
13%synergy
Silence
17%inclusion4 decks24 decks
6%synergy
Delay
17%inclusion4 decks24 decks
14%synergy
Demonic Consultation
17%inclusion4 decks24 decks
8%synergy
Counterspell
17%inclusion4 decks24 decks
-25%synergy
Borne Upon a Wind
17%inclusion4 decks24 decks
12%synergy
Waterlogged Teachings
17%inclusion4 decks24 decks
12%synergy
Deadly Rollick
13%inclusion3 decks24 decks
-2%synergy
Sacrifice
13%inclusion3 decks24 decks
12%synergy
Shred Memory
13%inclusion3 decks24 decks
12%synergy
Lim-Dûl's Vault
13%inclusion3 decks24 decks
9%synergy
Culling the Weak
13%inclusion3 decks24 decks
11%synergy
Darkblast
13%inclusion3 decks24 decks
12%synergy
Banishing Knack
13%inclusion3 decks24 decks
12%synergy
Void Rend
13%inclusion3 decks24 decks
-21%synergy
Faithful Mending
13%inclusion3 decks24 decks
9%synergy
Mana Leak
13%inclusion3 decks24 decks
11%synergy
Generous Gift
13%inclusion3 decks24 decks
-2%synergy
Mental Misstep
8.3%inclusion2 decks24 decks
1%synergy
Razorgrass Ambush
8.3%inclusion2 decks24 decks
7%synergy
Angel's Grace
8.3%inclusion2 decks24 decks
6%synergy
Winds of Rebuke
8.3%inclusion2 decks24 decks
8%synergy
Dispel
8.3%inclusion2 decks24 decks
5%synergy
Flusterstorm
8.3%inclusion2 decks24 decks
0%synergy
Into the Flood Maw
8.3%inclusion2 decks24 decks
5%synergy
Prismatic Strands
8.3%inclusion2 decks24 decks
8%synergy
Perplex
8.3%inclusion2 decks24 decks
7%synergy
Ad Nauseam
8.3%inclusion2 decks24 decks
6%synergy
Disenchant
8.3%inclusion2 decks24 decks
7%synergy
Miscast
8.3%inclusion2 decks24 decks
7%synergy
No More Lies
8.3%inclusion2 decks24 decks
7%synergy
Sorceries
Toxic Deluge
38%inclusion9 decks24 decks
18%synergy
Demonic Counsel
29%inclusion7 decks24 decks
28%synergy
Lively Dirge
21%inclusion5 decks24 decks
20%synergy
Unmarked Grave
17%inclusion4 decks24 decks
15%synergy
Imperial Seal
17%inclusion4 decks24 decks
9%synergy
Buried Alive
17%inclusion4 decks24 decks
13%synergy
Reanimate
17%inclusion4 decks24 decks
1%synergy
Supreme Verdict
13%inclusion3 decks24 decks
-2%synergy
Yawgmoth's Will
13%inclusion3 decks24 decks
11%synergy
Glimpse the Unthinkable
13%inclusion3 decks24 decks
12%synergy
Final Parting
13%inclusion3 decks24 decks
12%synergy
Damn
13%inclusion3 decks24 decks
-8%synergy
Grim Tutor
13%inclusion3 decks24 decks
8%synergy
Resurgent Belief
8.3%inclusion2 decks24 decks
6%synergy
Peer into the Abyss
8.3%inclusion2 decks24 decks
6%synergy
Idyllic Tutor
8.3%inclusion2 decks24 decks
4%synergy
Rite of Oblivion
8.3%inclusion2 decks24 decks
8%synergy
Mnemonic Betrayal
8.3%inclusion2 decks24 decks
5%synergy
Extinguish All Hope
8.3%inclusion2 decks24 decks
7%synergy
Beseech the Mirror
8.3%inclusion2 decks24 decks
4%synergy
Dance of the Manse
8.3%inclusion2 decks24 decks
5%synergy
Space-Time Anomaly
7.1%inclusion1 decks14 decks
5%synergy
Utility Artifacts
Mesmeric Orb
42%inclusion10 decks24 decks
41%synergy
The One Ring
29%inclusion7 decks24 decks
16%synergy
Wishclaw Talisman
29%inclusion7 decks24 decks
21%synergy
Lightning Greaves
8.3%inclusion2 decks24 decks
-14%synergy
Isochron Scepter
8.3%inclusion2 decks24 decks
6%synergy
Enchantments
Touch the Spirit Realm
46%inclusion11 decks24 decks
43%synergy
Ghostly Prison
46%inclusion11 decks24 decks
24%synergy
Dance of the Dead
42%inclusion10 decks24 decks
39%synergy
Static Prison
42%inclusion10 decks24 decks
41%synergy
Grasp of Fate
38%inclusion9 decks24 decks
31%synergy
Tinybones Joins Up
38%inclusion9 decks24 decks
36%synergy
Mirrormade
38%inclusion9 decks24 decks
28%synergy
Propaganda
38%inclusion9 decks24 decks
10%synergy
Authority of the Consuls
33%inclusion8 decks24 decks
22%synergy
Land Tax
29%inclusion7 decks24 decks
23%synergy
Greater Auramancy
29%inclusion7 decks24 decks
25%synergy
Aura of Silence
29%inclusion7 decks24 decks
26%synergy
Out of the Tombs
25%inclusion6 decks24 decks
25%synergy
Sphere of Safety
25%inclusion6 decks24 decks
16%synergy
Cemetery Tampering
25%inclusion6 decks24 decks
24%synergy
Secret Arcade // Dusty Parlor
25%inclusion6 decks24 decks
20%synergy
Seal of Removal
25%inclusion6 decks24 decks
24%synergy
Darksteel Mutation
21%inclusion5 decks24 decks
15%synergy
Founding the Third Path
21%inclusion5 decks24 decks
21%synergy
Chronic Flooding
21%inclusion5 decks24 decks
21%synergy
Estrid's Invocation
21%inclusion5 decks24 decks
16%synergy
Starfield of Nyx
21%inclusion5 decks24 decks
17%synergy
The Tale of Tamiyo
21%inclusion5 decks24 decks
20%synergy
Sheltered by Ghosts
21%inclusion5 decks24 decks
18%synergy
Black Market Connections
21%inclusion5 decks24 decks
7%synergy
Cacophony Unleashed
17%inclusion4 decks24 decks
15%synergy
Out of Time
17%inclusion4 decks24 decks
16%synergy
Nowhere to Run
17%inclusion4 decks24 decks
15%synergy
Trouble in Pairs
17%inclusion4 decks24 decks
11%synergy
Standstill
17%inclusion4 decks24 decks
16%synergy
Parallax Wave
13%inclusion3 decks24 decks
12%synergy
Court of Cunning
13%inclusion3 decks24 decks
12%synergy
Attunement
13%inclusion3 decks24 decks
12%synergy
Exquisite Blood
13%inclusion3 decks24 decks
6%synergy
Karmic Justice
13%inclusion3 decks24 decks
10%synergy
Screams from Within
13%inclusion3 decks24 decks
12%synergy
All That Glitters
13%inclusion3 decks24 decks
4%synergy
Solitary Confinement
13%inclusion3 decks24 decks
11%synergy
Ethereal Armor
13%inclusion3 decks24 decks
8%synergy
Dog Umbra
13%inclusion3 decks24 decks
12%synergy
Phyrexian Arena
13%inclusion3 decks24 decks
-2%synergy
Stillness in Motion
10%inclusion2 decks20 decks
10%synergy
Stony Silence
8.3%inclusion2 decks24 decks
8%synergy
Imprisoned in the Moon
8.3%inclusion2 decks24 decks
2%synergy
Glasswing Grace
8.3%inclusion2 decks24 decks
5%synergy
Sigil of the Empty Throne
8.3%inclusion2 decks24 decks
2%synergy
Unable to Scream
8.3%inclusion2 decks24 decks
7%synergy
Opalescence
8.3%inclusion2 decks24 decks
8%synergy
Hopeless Nightmare
8.3%inclusion2 decks24 decks
8%synergy
Dance of Many
8.3%inclusion2 decks24 decks
8%synergy
Planeswalkers
Teferi, Time Raveler
29%inclusion7 decks24 decks
21%synergy
Narset, Parter of Veils
8.3%inclusion2 decks24 decks
4%synergy
Utility Lands
Otawara, Soaring City
46%inclusion11 decks24 decks
27%synergy
Cephalid Coliseum
42%inclusion10 decks24 decks
38%synergy
Hall of Heliod's Generosity
38%inclusion9 decks24 decks
24%synergy
Takenuma, Abandoned Mire
33%inclusion8 decks24 decks
27%synergy
Bojuka Bog
29%inclusion7 decks24 decks
2%synergy
Urza's Saga
21%inclusion5 decks24 decks
9%synergy
Serra's Sanctum
17%inclusion4 decks24 decks
15%synergy
Urborg, Tomb of Yawgmoth
17%inclusion4 decks24 decks
4%synergy
Volrath's Stronghold
13%inclusion3 decks24 decks
12%synergy
Emergence Zone
13%inclusion3 decks24 decks
10%synergy
Eiganjo, Seat of the Empire
13%inclusion3 decks24 decks
7%synergy
Mistrise Village
5.0%inclusion1 decks20 decks
1%synergy
Mana Artifacts
Sol Ring
96%inclusion23 decks24 decks
6%synergy
Arcane Signet
83%inclusion20 decks24 decks
-5%synergy
Talisman of Dominance
79%inclusion19 decks24 decks
30%synergy
Talisman of Progress
75%inclusion18 decks24 decks
32%synergy
Talisman of Hierarchy
75%inclusion18 decks24 decks
31%synergy
Fellwar Stone
50%inclusion12 decks24 decks
16%synergy
Chrome Mox
25%inclusion6 decks24 decks
15%synergy
Mana Vault
21%inclusion5 decks24 decks
12%synergy
Dimir Signet
21%inclusion5 decks24 decks
-11%synergy
Azorius Signet
21%inclusion5 decks24 decks
-11%synergy
Lotus Petal
17%inclusion4 decks24 decks
6%synergy
Orzhov Signet
17%inclusion4 decks24 decks
-17%synergy
Mox Opal
13%inclusion3 decks24 decks
4%synergy
Mox Amber
8.3%inclusion2 decks24 decks
2%synergy
Hourglass of the Lost
8.3%inclusion2 decks24 decks
8%synergy
Lands
Command Tower
100%inclusion24 decks24 decks
7%synergy
Swamp
96%inclusion23 decks24 decks
4%synergy
Island
96%inclusion23 decks24 decks
3%synergy
Plains
96%inclusion23 decks24 decks
4%synergy
Watery Grave
88%inclusion21 decks24 decks
37%synergy
Godless Shrine
83%inclusion20 decks24 decks
33%synergy
Hallowed Fountain
79%inclusion19 decks24 decks
30%synergy
Polluted Delta
75%inclusion18 decks24 decks
37%synergy
Marsh Flats
71%inclusion17 decks24 decks
35%synergy
Flooded Strand
71%inclusion17 decks24 decks
33%synergy
Exotic Orchard
63%inclusion15 decks24 decks
4%synergy
Adarkar Wastes
63%inclusion15 decks24 decks
31%synergy
Caves of Koilos
54%inclusion13 decks24 decks
19%synergy
Sea of Clouds
54%inclusion13 decks24 decks
19%synergy
Raffine's Tower
54%inclusion13 decks24 decks
13%synergy
Underground River
54%inclusion13 decks24 decks
21%synergy
Morphic Pool
50%inclusion12 decks24 decks
16%synergy
Shadowy Backstreet
46%inclusion11 decks24 decks
33%synergy
Vault of Champions
46%inclusion11 decks24 decks
13%synergy
Undercity Sewers
42%inclusion10 decks24 decks
27%synergy
Glacial Fortress
38%inclusion9 decks24 decks
-3%synergy
Windswept Heath
38%inclusion9 decks24 decks
28%synergy
Meticulous Archive
38%inclusion9 decks24 decks
24%synergy
Verdant Catacombs
33%inclusion8 decks24 decks
23%synergy
Isolated Chapel
33%inclusion8 decks24 decks
-6%synergy
Drowned Catacomb
33%inclusion8 decks24 decks
-3%synergy
Bloodstained Mire
33%inclusion8 decks24 decks
22%synergy
Misty Rainforest
29%inclusion7 decks24 decks
18%synergy
Sink into Stupor
29%inclusion7 decks24 decks
16%synergy
Arid Mesa
29%inclusion7 decks24 decks
19%synergy
Mana Confluence
29%inclusion7 decks24 decks
15%synergy
Valgavoth's Lair
25%inclusion6 decks24 decks
22%synergy
Reflecting Pool
25%inclusion6 decks24 decks
17%synergy
Scalding Tarn
25%inclusion6 decks24 decks
14%synergy
Gloomlake Verge
25%inclusion6 decks24 decks
14%synergy
City of Brass
25%inclusion6 decks24 decks
10%synergy
Tundra
21%inclusion5 decks24 decks
5%synergy
Clearwater Pathway
21%inclusion5 decks24 decks
14%synergy
Brightclimb Pathway
21%inclusion5 decks24 decks
14%synergy
Prairie Stream
21%inclusion5 decks24 decks
-20%synergy
Fell the Profane
17%inclusion4 decks24 decks
8%synergy
Contaminated Landscape
17%inclusion4 decks24 decks
2%synergy
Hengegate Pathway
17%inclusion4 decks24 decks
10%synergy
Underground Sea
17%inclusion4 decks24 decks
1%synergy
Spire of Industry
17%inclusion4 decks24 decks
8%synergy
Skycloud Expanse
17%inclusion4 decks24 decks
2%synergy
Arcane Sanctum
17%inclusion4 decks24 decks
-38%synergy
River of Tears
17%inclusion4 decks24 decks
14%synergy
Gemstone Caverns
17%inclusion4 decks24 decks
9%synergy
Scrubland
17%inclusion4 decks24 decks
1%synergy
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