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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Wan Shi Tong, Librarian
11%inclusion1 decks9 decks
6%synergy
High Synergy Cards
Ripples of Undeath
88%inclusion22 decks25 decks
85%synergy
Necromancy
84%inclusion21 decks25 decks
79%synergy
Animate Dead
88%inclusion22 decks25 decks
78%synergy
Mystic Remora
96%inclusion24 decks25 decks
75%synergy
Entity Tracker
80%inclusion20 decks25 decks
74%synergy
Dress Down
72%inclusion18 decks25 decks
70%synergy
Amphibian Downpour
72%inclusion18 decks25 decks
67%synergy
Sevinne's Reclamation
72%inclusion18 decks25 decks
63%synergy
Abdel Adrian, Gorion's Ward
60%inclusion15 decks25 decks
58%synergy
Blind Obedience
64%inclusion16 decks25 decks
52%synergy
Top Cards
Swords to Plowshares
72%inclusion18 decks25 decks
4%synergy
An Offer You Can't Refuse
60%inclusion15 decks25 decks
33%synergy
Inquisitive Glimmer
56%inclusion14 decks25 decks
48%synergy
Dark Ritual
52%inclusion13 decks25 decks
33%synergy
Fear of Impostors
52%inclusion13 decks25 decks
50%synergy
Ledger Shredder
52%inclusion13 decks25 decks
43%synergy
The Meathook Massacre
48%inclusion12 decks25 decks
45%synergy
Touch the Spirit Realm
48%inclusion12 decks25 decks
45%synergy
Swan Song
48%inclusion12 decks25 decks
28%synergy
Ghostly Prison
48%inclusion12 decks25 decks
26%synergy
Game Changers
Smothering Tithe
80%inclusion20 decks25 decks
48%synergy
Rhystic Study
72%inclusion18 decks25 decks
40%synergy
Enlightened Tutor
60%inclusion15 decks25 decks
40%synergy
Demonic Tutor
52%inclusion13 decks25 decks
31%synergy
Ancient Tomb
48%inclusion12 decks25 decks
35%synergy
Vampiric Tutor
44%inclusion11 decks25 decks
26%synergy
Force of Will
36%inclusion9 decks25 decks
23%synergy
Fierce Guardianship
36%inclusion9 decks25 decks
15%synergy
Necropotence
32%inclusion8 decks25 decks
25%synergy
Gifts Ungiven
32%inclusion8 decks25 decks
30%synergy
Creatures
Scrabbling Skullcrab
44%inclusion11 decks25 decks
43%synergy
Esper Sentinel
44%inclusion11 decks25 decks
16%synergy
Overlord of the Balemurk
40%inclusion10 decks25 decks
38%synergy
Lotho, Corrupt Shirriff
36%inclusion9 decks25 decks
19%synergy
Mesa Enchantress
36%inclusion9 decks25 decks
27%synergy
Victor, Valgavoth's Seneschal
36%inclusion9 decks25 decks
34%synergy
Starfield Mystic
32%inclusion8 decks25 decks
25%synergy
Gravebreaker Lamia
32%inclusion8 decks25 decks
31%synergy
Demon of Fate's Design
32%inclusion8 decks25 decks
27%synergy
Zur, Eternal Schemer
32%inclusion8 decks25 decks
29%synergy
Orcish Bowmasters
32%inclusion8 decks25 decks
21%synergy
Thassa's Oracle
28%inclusion7 decks25 decks
18%synergy
Overlord of the Floodpits
28%inclusion7 decks25 decks
24%synergy
Faerie Mastermind
24%inclusion6 decks25 decks
14%synergy
Grand Abolisher
24%inclusion6 decks25 decks
9%synergy
Displacer Kitten
20%inclusion5 decks25 decks
13%synergy
Valley Floodcaller
20%inclusion5 decks25 decks
16%synergy
Hullbreaker Horror
20%inclusion5 decks25 decks
14%synergy
Ghostly Pilferer
20%inclusion5 decks25 decks
13%synergy
Opposition Agent
16%inclusion4 decks25 decks
7%synergy
Lurrus of the Dream-Den
16%inclusion4 decks25 decks
14%synergy
Heliod, Sun-Crowned
16%inclusion4 decks25 decks
12%synergy
Hedron Crab
16%inclusion4 decks25 decks
15%synergy
Leonin Relic-Warder
16%inclusion4 decks25 decks
16%synergy
Talion, the Kindly Lord
16%inclusion4 decks25 decks
8%synergy
Fear of Sleep Paralysis
16%inclusion4 decks25 decks
10%synergy
Laboratory Maniac
16%inclusion4 decks25 decks
13%synergy
Psychic Frog
16%inclusion4 decks25 decks
9%synergy
Aminatou, Veil Piercer
16%inclusion4 decks25 decks
15%synergy
Ondu Spiritdancer
16%inclusion4 decks25 decks
10%synergy
Witch Enchanter
12%inclusion3 decks25 decks
5%synergy
Archon of Sun's Grace
12%inclusion3 decks25 decks
7%synergy
Walking Ballista
12%inclusion3 decks25 decks
10%synergy
Hydroelectric Specimen
12%inclusion3 decks25 decks
9%synergy
Enduring Curiosity
12%inclusion3 decks25 decks
4%synergy
Warehouse Tabby
12%inclusion3 decks25 decks
12%synergy
Drannith Magistrate
12%inclusion3 decks25 decks
4%synergy
Mockingbird
12%inclusion3 decks25 decks
8%synergy
Doomwake Giant
12%inclusion3 decks25 decks
6%synergy
Grim Guardian
12%inclusion3 decks25 decks
9%synergy
Heliod, the Radiant Dawn
12%inclusion3 decks25 decks
8%synergy
Zur the Enchanter
12%inclusion3 decks25 decks
7%synergy
Dauthi Voidwalker
12%inclusion3 decks25 decks
6%synergy
Alseid of Life's Bounty
12%inclusion3 decks25 decks
11%synergy
Emet-Selch of the Third Seat
11%inclusion2 decks18 decks
1%synergy
Hoarding Broodlord
8.0%inclusion2 decks25 decks
6%synergy
Doom Whisperer
8.0%inclusion2 decks25 decks
6%synergy
Stitcher's Supplier
8.0%inclusion2 decks25 decks
7%synergy
Enduring Tenacity
8.0%inclusion2 decks25 decks
1%synergy
Nashi, Searcher in the Dark
8.0%inclusion2 decks25 decks
8%synergy
Instants
Entomb
44%inclusion11 decks25 decks
37%synergy
Dovin's Veto
40%inclusion10 decks25 decks
15%synergy
Path to Exile
40%inclusion10 decks25 decks
-2%synergy
Cyclonic Rift
32%inclusion8 decks25 decks
7%synergy
Mana Drain
32%inclusion8 decks25 decks
15%synergy
Mystical Tutor
32%inclusion8 decks25 decks
20%synergy
Frantic Search
28%inclusion7 decks25 decks
11%synergy
Arcane Denial
28%inclusion7 decks25 decks
8%synergy
Sink into Stupor
28%inclusion7 decks25 decks
15%synergy
Muddle the Mixture
24%inclusion6 decks25 decks
20%synergy
Force of Negation
24%inclusion6 decks25 decks
12%synergy
Retraction Helix
20%inclusion5 decks25 decks
19%synergy
Intuition
20%inclusion5 decks25 decks
18%synergy
Silence
20%inclusion5 decks25 decks
10%synergy
Counterspell
20%inclusion5 decks25 decks
-21%synergy
Borne Upon a Wind
20%inclusion5 decks25 decks
15%synergy
Fell the Profane
16%inclusion4 decks25 decks
7%synergy
Tainted Pact
16%inclusion4 decks25 decks
8%synergy
Teferi's Protection
16%inclusion4 decks25 decks
-1%synergy
Negate
16%inclusion4 decks25 decks
0%synergy
Brainstorm
16%inclusion4 decks25 decks
-1%synergy
Cabal Ritual
16%inclusion4 decks25 decks
13%synergy
Delay
16%inclusion4 decks25 decks
14%synergy
Demonic Consultation
16%inclusion4 decks25 decks
8%synergy
Waterlogged Teachings
16%inclusion4 decks25 decks
11%synergy
Mana Leak
16%inclusion4 decks25 decks
14%synergy
Deadly Rollick
12%inclusion3 decks25 decks
-2%synergy
Sacrifice
12%inclusion3 decks25 decks
11%synergy
Shred Memory
12%inclusion3 decks25 decks
12%synergy
Lim-Dûl's Vault
12%inclusion3 decks25 decks
9%synergy
Culling the Weak
12%inclusion3 decks25 decks
10%synergy
Darkblast
12%inclusion3 decks25 decks
12%synergy
Banishing Knack
12%inclusion3 decks25 decks
12%synergy
Faithful Mending
12%inclusion3 decks25 decks
8%synergy
Void Rend
12%inclusion3 decks25 decks
-22%synergy
Generous Gift
12%inclusion3 decks25 decks
-3%synergy
Mental Misstep
8.0%inclusion2 decks25 decks
1%synergy
Soul Partition
8.0%inclusion2 decks25 decks
8%synergy
Razorgrass Ambush
8.0%inclusion2 decks25 decks
7%synergy
Angel's Grace
8.0%inclusion2 decks25 decks
5%synergy
Dispel
8.0%inclusion2 decks25 decks
4%synergy
Flusterstorm
8.0%inclusion2 decks25 decks
0%synergy
Prismatic Strands
8.0%inclusion2 decks25 decks
8%synergy
Perplex
8.0%inclusion2 decks25 decks
7%synergy
Ad Nauseam
8.0%inclusion2 decks25 decks
6%synergy
Disenchant
8.0%inclusion2 decks25 decks
6%synergy
Winds of Rebuke
8.0%inclusion2 decks25 decks
8%synergy
Inkshield
8.0%inclusion2 decks25 decks
-1%synergy
Into the Flood Maw
8.0%inclusion2 decks25 decks
4%synergy
Miscast
8.0%inclusion2 decks25 decks
7%synergy
Sorceries
Windfall
44%inclusion11 decks25 decks
30%synergy
Toxic Deluge
40%inclusion10 decks25 decks
20%synergy
Demonic Counsel
28%inclusion7 decks25 decks
27%synergy
Lively Dirge
20%inclusion5 decks25 decks
19%synergy
Reanimate
20%inclusion5 decks25 decks
4%synergy
Supreme Verdict
16%inclusion4 decks25 decks
1%synergy
Unmarked Grave
16%inclusion4 decks25 decks
15%synergy
Imperial Seal
16%inclusion4 decks25 decks
8%synergy
Buried Alive
16%inclusion4 decks25 decks
12%synergy
Yawgmoth's Will
12%inclusion3 decks25 decks
11%synergy
Glimpse the Unthinkable
12%inclusion3 decks25 decks
12%synergy
Final Parting
12%inclusion3 decks25 decks
11%synergy
Damn
12%inclusion3 decks25 decks
-8%synergy
Grim Tutor
12%inclusion3 decks25 decks
8%synergy
Peer into the Abyss
8.0%inclusion2 decks25 decks
5%synergy
Resurgent Belief
8.0%inclusion2 decks25 decks
6%synergy
Idyllic Tutor
8.0%inclusion2 decks25 decks
4%synergy
Rite of Oblivion
8.0%inclusion2 decks25 decks
7%synergy
Extinguish All Hope
8.0%inclusion2 decks25 decks
6%synergy
Beseech the Mirror
8.0%inclusion2 decks25 decks
4%synergy
Dance of the Manse
8.0%inclusion2 decks25 decks
4%synergy
Mnemonic Betrayal
8.0%inclusion2 decks25 decks
5%synergy
Space-Time Anomaly
6.7%inclusion1 decks15 decks
5%synergy
Utility Artifacts
Mesmeric Orb
40%inclusion10 decks25 decks
39%synergy
The One Ring
28%inclusion7 decks25 decks
14%synergy
Wishclaw Talisman
28%inclusion7 decks25 decks
20%synergy
Lightning Greaves
8.0%inclusion2 decks25 decks
-14%synergy
Isochron Scepter
8.0%inclusion2 decks25 decks
6%synergy
Enchantments
Seal of Cleansing
48%inclusion12 decks25 decks
47%synergy
Dance of the Dead
40%inclusion10 decks25 decks
38%synergy
Mirrormade
40%inclusion10 decks25 decks
30%synergy
Static Prison
40%inclusion10 decks25 decks
40%synergy
Propaganda
40%inclusion10 decks25 decks
13%synergy
Grasp of Fate
36%inclusion9 decks25 decks
30%synergy
Tinybones Joins Up
36%inclusion9 decks25 decks
35%synergy
Authority of the Consuls
36%inclusion9 decks25 decks
25%synergy
Land Tax
32%inclusion8 decks25 decks
26%synergy
Greater Auramancy
32%inclusion8 decks25 decks
28%synergy
Sphere of Safety
28%inclusion7 decks25 decks
19%synergy
Out of the Tombs
28%inclusion7 decks25 decks
28%synergy
Secret Arcade // Dusty Parlor
28%inclusion7 decks25 decks
23%synergy
Aura of Silence
28%inclusion7 decks25 decks
25%synergy
Starfield of Nyx
24%inclusion6 decks25 decks
20%synergy
Black Market Connections
24%inclusion6 decks25 decks
10%synergy
Cemetery Tampering
24%inclusion6 decks25 decks
23%synergy
Sheltered by Ghosts
24%inclusion6 decks25 decks
21%synergy
Seal of Removal
24%inclusion6 decks25 decks
23%synergy
Darksteel Mutation
20%inclusion5 decks25 decks
14%synergy
Cacophony Unleashed
20%inclusion5 decks25 decks
18%synergy
Founding the Third Path
20%inclusion5 decks25 decks
20%synergy
Chronic Flooding
20%inclusion5 decks25 decks
20%synergy
Estrid's Invocation
20%inclusion5 decks25 decks
15%synergy
The Tale of Tamiyo
20%inclusion5 decks25 decks
20%synergy
Out of Time
16%inclusion4 decks25 decks
15%synergy
Nowhere to Run
16%inclusion4 decks25 decks
15%synergy
Ethereal Armor
16%inclusion4 decks25 decks
11%synergy
Trouble in Pairs
16%inclusion4 decks25 decks
10%synergy
Standstill
16%inclusion4 decks25 decks
16%synergy
Parallax Wave
12%inclusion3 decks25 decks
12%synergy
Court of Cunning
12%inclusion3 decks25 decks
11%synergy
Sigil of the Empty Throne
12%inclusion3 decks25 decks
6%synergy
Attunement
12%inclusion3 decks25 decks
12%synergy
Exquisite Blood
12%inclusion3 decks25 decks
6%synergy
Karmic Justice
12%inclusion3 decks25 decks
9%synergy
All That Glitters
12%inclusion3 decks25 decks
3%synergy
Solitary Confinement
12%inclusion3 decks25 decks
10%synergy
Dog Umbra
12%inclusion3 decks25 decks
12%synergy
Screams from Within
12%inclusion3 decks25 decks
12%synergy
Phyrexian Arena
12%inclusion3 decks25 decks
-2%synergy
Stillness in Motion
10%inclusion2 decks21 decks
9%synergy
Stony Silence
8.0%inclusion2 decks25 decks
8%synergy
Unable to Scream
8.0%inclusion2 decks25 decks
7%synergy
Hopeless Nightmare
8.0%inclusion2 decks25 decks
8%synergy
Imprisoned in the Moon
8.0%inclusion2 decks25 decks
1%synergy
Dance of Many
8.0%inclusion2 decks25 decks
8%synergy
Glasswing Grace
8.0%inclusion2 decks25 decks
5%synergy
Copy Enchantment
8.0%inclusion2 decks25 decks
3%synergy
Leyline of Anticipation
8.0%inclusion2 decks25 decks
3%synergy
Planeswalkers
Teferi, Time Raveler
28%inclusion7 decks25 decks
20%synergy
Narset, Parter of Veils
8.0%inclusion2 decks25 decks
4%synergy
Utility Lands
Otawara, Soaring City
44%inclusion11 decks25 decks
25%synergy
Hall of Heliod's Generosity
40%inclusion10 decks25 decks
27%synergy
Cephalid Coliseum
40%inclusion10 decks25 decks
36%synergy
Bojuka Bog
32%inclusion8 decks25 decks
5%synergy
Takenuma, Abandoned Mire
32%inclusion8 decks25 decks
25%synergy
Urza's Saga
20%inclusion5 decks25 decks
8%synergy
Serra's Sanctum
16%inclusion4 decks25 decks
14%synergy
Urborg, Tomb of Yawgmoth
16%inclusion4 decks25 decks
3%synergy
Volrath's Stronghold
12%inclusion3 decks25 decks
11%synergy
Emergence Zone
12%inclusion3 decks25 decks
10%synergy
Eiganjo, Seat of the Empire
12%inclusion3 decks25 decks
7%synergy
Mana Artifacts
Sol Ring
96%inclusion24 decks25 decks
6%synergy
Arcane Signet
84%inclusion21 decks25 decks
-4%synergy
Talisman of Dominance
76%inclusion19 decks25 decks
27%synergy
Talisman of Progress
72%inclusion18 decks25 decks
29%synergy
Talisman of Hierarchy
72%inclusion18 decks25 decks
29%synergy
Fellwar Stone
48%inclusion12 decks25 decks
14%synergy
Chrome Mox
24%inclusion6 decks25 decks
14%synergy
Mana Vault
20%inclusion5 decks25 decks
11%synergy
Dimir Signet
20%inclusion5 decks25 decks
-12%synergy
Azorius Signet
20%inclusion5 decks25 decks
-12%synergy
Lotus Petal
16%inclusion4 decks25 decks
5%synergy
Orzhov Signet
16%inclusion4 decks25 decks
-18%synergy
Mox Opal
12%inclusion3 decks25 decks
3%synergy
Hourglass of the Lost
8.0%inclusion2 decks25 decks
8%synergy
Mox Amber
8.0%inclusion2 decks25 decks
2%synergy
Lands
Command Tower
100%inclusion25 decks25 decks
8%synergy
Swamp
96%inclusion24 decks25 decks
5%synergy
Island
96%inclusion24 decks25 decks
3%synergy
Plains
96%inclusion24 decks25 decks
5%synergy
Watery Grave
84%inclusion21 decks25 decks
34%synergy
Godless Shrine
80%inclusion20 decks25 decks
30%synergy
Hallowed Fountain
76%inclusion19 decks25 decks
27%synergy
Polluted Delta
72%inclusion18 decks25 decks
34%synergy
Marsh Flats
68%inclusion17 decks25 decks
32%synergy
Flooded Strand
68%inclusion17 decks25 decks
30%synergy
Exotic Orchard
64%inclusion16 decks25 decks
5%synergy
Adarkar Wastes
64%inclusion16 decks25 decks
33%synergy
Caves of Koilos
56%inclusion14 decks25 decks
21%synergy
Underground River
56%inclusion14 decks25 decks
23%synergy
Sea of Clouds
52%inclusion13 decks25 decks
16%synergy
Raffine's Tower
52%inclusion13 decks25 decks
11%synergy
Morphic Pool
48%inclusion12 decks25 decks
14%synergy
Shadowy Backstreet
44%inclusion11 decks25 decks
32%synergy
Vault of Champions
44%inclusion11 decks25 decks
11%synergy
Glacial Fortress
40%inclusion10 decks25 decks
0%synergy
Undercity Sewers
40%inclusion10 decks25 decks
26%synergy
Windswept Heath
36%inclusion9 decks25 decks
26%synergy
Isolated Chapel
36%inclusion9 decks25 decks
-3%synergy
Drowned Catacomb
36%inclusion9 decks25 decks
0%synergy
Meticulous Archive
36%inclusion9 decks25 decks
22%synergy
Verdant Catacombs
32%inclusion8 decks25 decks
22%synergy
Bloodstained Mire
32%inclusion8 decks25 decks
21%synergy
Misty Rainforest
28%inclusion7 decks25 decks
17%synergy
Valgavoth's Lair
28%inclusion7 decks25 decks
25%synergy
Sink into Stupor
28%inclusion7 decks25 decks
15%synergy
Arid Mesa
28%inclusion7 decks25 decks
18%synergy
Mana Confluence
28%inclusion7 decks25 decks
14%synergy
Prairie Stream
24%inclusion6 decks25 decks
-17%synergy
Reflecting Pool
24%inclusion6 decks25 decks
16%synergy
Scalding Tarn
24%inclusion6 decks25 decks
13%synergy
Gloomlake Verge
24%inclusion6 decks25 decks
13%synergy
City of Brass
24%inclusion6 decks25 decks
9%synergy
Tundra
20%inclusion5 decks25 decks
4%synergy
Clearwater Pathway
20%inclusion5 decks25 decks
13%synergy
Brightclimb Pathway
20%inclusion5 decks25 decks
13%synergy
Arcane Sanctum
20%inclusion5 decks25 decks
-34%synergy
Fell the Profane
16%inclusion4 decks25 decks
7%synergy
Contaminated Landscape
16%inclusion4 decks25 decks
2%synergy
Underground Sea
16%inclusion4 decks25 decks
0%synergy
River of Tears
16%inclusion4 decks25 decks
14%synergy
Hengegate Pathway
16%inclusion4 decks25 decks
10%synergy
Spire of Industry
16%inclusion4 decks25 decks
7%synergy
Gemstone Caverns
16%inclusion4 decks25 decks
8%synergy
Shattered Sanctum
16%inclusion4 decks25 decks
0%synergy
Scrubland
16%inclusion4 decks25 decks
0%synergy
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