The Master of Keys (Commander) - Core Mill

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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Dimensional Exile
25%inclusion1 decks4 decks
25%synergy
Retro-Mutation
25%inclusion1 decks4 decks
25%synergy
High Synergy Cards
Inquisitive Glimmer
91%inclusion20 decks22 decks
84%synergy
Starfield Mystic
77%inclusion17 decks22 decks
71%synergy
Entity Tracker
73%inclusion16 decks22 decks
67%synergy
Doomwake Giant
68%inclusion15 decks22 decks
62%synergy
Fear of Impostors
64%inclusion14 decks22 decks
62%synergy
Defiled Crypt // Cadaver Lab
55%inclusion12 decks22 decks
54%synergy
Scrabbling Skullcrab
55%inclusion12 decks22 decks
54%synergy
Victor, Valgavoth's Seneschal
55%inclusion12 decks22 decks
53%synergy
Mesa Enchantress
59%inclusion13 decks22 decks
50%synergy
The Tale of Tamiyo
50%inclusion11 decks22 decks
50%synergy
Top Cards
Demon of Fate's Design
55%inclusion12 decks22 decks
49%synergy
Grasp of Fate
50%inclusion11 decks22 decks
44%synergy
Fear of Sleep Paralysis
50%inclusion11 decks22 decks
45%synergy
Cemetery Tampering
45%inclusion10 decks22 decks
45%synergy
Dress Down
45%inclusion10 decks22 decks
43%synergy
Sphere of Safety
41%inclusion9 decks22 decks
31%synergy
Swords to Plowshares
41%inclusion9 decks22 decks
-27%synergy
Ghostly Dancers
41%inclusion9 decks22 decks
38%synergy
Secret Arcade // Dusty Parlor
41%inclusion9 decks22 decks
36%synergy
Ondu Spiritdancer
41%inclusion9 decks22 decks
35%synergy
Creatures
Gravebreaker Lamia
36%inclusion8 decks22 decks
35%synergy
Overlord of the Floodpits
36%inclusion8 decks22 decks
33%synergy
Soaring Lightbringer
36%inclusion8 decks22 decks
32%synergy
Silent Hallcreeper
36%inclusion8 decks22 decks
32%synergy
Aminatou, Veil Piercer
36%inclusion8 decks22 decks
35%synergy
Overlord of the Balemurk
32%inclusion7 decks22 decks
30%synergy
Enduring Curiosity
32%inclusion7 decks22 decks
24%synergy
Heliod, the Radiant Dawn
32%inclusion7 decks22 decks
28%synergy
Zur, Eternal Schemer
32%inclusion7 decks22 decks
29%synergy
Fear of Surveillance
27%inclusion6 decks22 decks
27%synergy
Skullsnap Nuisance
27%inclusion6 decks22 decks
27%synergy
Moon-Blessed Cleric
23%inclusion5 decks22 decks
18%synergy
Spirited Companion
23%inclusion5 decks22 decks
21%synergy
Alseid of Life's Bounty
23%inclusion5 decks22 decks
21%synergy
Zur the Enchanter
23%inclusion5 decks22 decks
18%synergy
Overlord of the Mistmoors
18%inclusion4 decks22 decks
16%synergy
Appendage Amalgam
18%inclusion4 decks22 decks
18%synergy
Archetype of Imagination
18%inclusion4 decks22 decks
13%synergy
Creeping Peeper
18%inclusion4 decks22 decks
18%synergy
Nashi, Searcher in the Dark
18%inclusion4 decks22 decks
18%synergy
Grim Guardian
18%inclusion4 decks22 decks
16%synergy
Mindwrack Harpy
18%inclusion4 decks22 decks
18%synergy
Starnheim Courser
14%inclusion3 decks22 decks
10%synergy
Stenn, Paranoid Partisan
14%inclusion3 decks22 decks
12%synergy
Phenax, God of Deception
14%inclusion3 decks22 decks
13%synergy
Lotho, Corrupt Shirriff
14%inclusion3 decks22 decks
-3%synergy
The Mindskinner
14%inclusion3 decks22 decks
13%synergy
Ashiok's Reaper
14%inclusion3 decks22 decks
13%synergy
Boggart Trawler
14%inclusion3 decks22 decks
11%synergy
Athreos, Shroud-Veiled
14%inclusion3 decks22 decks
9%synergy
Ancient Cellarspawn
14%inclusion3 decks22 decks
11%synergy
Nightmare Shepherd
14%inclusion3 decks22 decks
11%synergy
Abdel Adrian, Gorion's Ward
14%inclusion3 decks22 decks
12%synergy
Summon: Primal Odin
11%inclusion2 decks19 decks
6%synergy
Hope Estheim
11%inclusion2 decks19 decks
9%synergy
Eidolon of Astral Winds
10%inclusion2 decks20 decks
10%synergy
Fear of Infinity
9.1%inclusion2 decks22 decks
9%synergy
Witch Enchanter
9.1%inclusion2 decks22 decks
2%synergy
Fear of Isolation
9.1%inclusion2 decks22 decks
9%synergy
Mulldrifter
9.1%inclusion2 decks22 decks
5%synergy
Fear of Failed Tests
9.1%inclusion2 decks22 decks
9%synergy
Fear of Lost Teeth
9.1%inclusion2 decks22 decks
9%synergy
Archon of Sun's Grace
9.1%inclusion2 decks22 decks
5%synergy
Zellix, Sanity Flayer
9.1%inclusion2 decks22 decks
9%synergy
Hydroelectric Specimen
9.1%inclusion2 decks22 decks
6%synergy
Sage of Mysteries
9.1%inclusion2 decks22 decks
9%synergy
Ruin Crab
9.1%inclusion2 decks22 decks
8%synergy
Fear of Abduction
9.1%inclusion2 decks22 decks
9%synergy
Fear of the Dark
9.1%inclusion2 decks22 decks
9%synergy
Enduring Innocence
9.1%inclusion2 decks22 decks
7%synergy
Instants
Thirst for Meaning
36%inclusion8 decks22 decks
35%synergy
Counterspell
36%inclusion8 decks22 decks
-5%synergy
Path to Exile
36%inclusion8 decks22 decks
-6%synergy
Arcane Denial
32%inclusion7 decks22 decks
12%synergy
Otherworldly Gaze
32%inclusion7 decks22 decks
30%synergy
Frantic Search
18%inclusion4 decks22 decks
0%synergy
Swallowed by Leviathan
17%inclusion3 decks18 decks
16%synergy
Dreams of Laguna
16%inclusion3 decks19 decks
16%synergy
Fell the Profane
14%inclusion3 decks22 decks
5%synergy
Drown in the Loch
14%inclusion3 decks22 decks
12%synergy
Dovin's Veto
14%inclusion3 decks22 decks
-12%synergy
An Offer You Can't Refuse
14%inclusion3 decks22 decks
-14%synergy
Negate
14%inclusion3 decks22 decks
-3%synergy
Dark Ritual
14%inclusion3 decks22 decks
-6%synergy
Faithful Mending
14%inclusion3 decks22 decks
10%synergy
Sink into Stupor
14%inclusion3 decks22 decks
1%synergy
Inkshield
14%inclusion3 decks22 decks
4%synergy
Return to Dust
9.1%inclusion2 decks22 decks
6%synergy
Fact or Fiction
9.1%inclusion2 decks22 decks
5%synergy
Void Rend
9.1%inclusion2 decks22 decks
-25%synergy
Swan Song
9.1%inclusion2 decks22 decks
-11%synergy
Get Out
9.1%inclusion2 decks22 decks
9%synergy
Utter End
9.1%inclusion2 decks22 decks
3%synergy
Drown in Dreams
9.1%inclusion2 decks22 decks
9%synergy
Sejiri Shelter
9.1%inclusion2 decks22 decks
7%synergy
Waterlogged Teachings
9.1%inclusion2 decks22 decks
5%synergy
Dig Through Time
9.1%inclusion2 decks22 decks
4%synergy
Generous Gift
9.1%inclusion2 decks22 decks
-5%synergy
Refute
5.0%inclusion1 decks20 decks
2%synergy
Sorceries
Redress Fate
41%inclusion9 decks22 decks
35%synergy
Dance of the Manse
32%inclusion7 decks22 decks
28%synergy
Singularity Rupture
31%inclusion5 decks16 decks
29%synergy
Space-Time Anomaly
25%inclusion4 decks16 decks
23%synergy
Windfall
23%inclusion5 decks22 decks
9%synergy
Resurgent Belief
18%inclusion4 decks22 decks
16%synergy
Sevinne's Reclamation
18%inclusion4 decks22 decks
9%synergy
Time Wipe
18%inclusion4 decks22 decks
11%synergy
Demonic Counsel
18%inclusion4 decks22 decks
17%synergy
Reanimate
18%inclusion4 decks22 decks
2%synergy
Extinguish All Hope
18%inclusion4 decks22 decks
17%synergy
Glimpse the Unthinkable
14%inclusion3 decks22 decks
13%synergy
Damn
14%inclusion3 decks22 decks
-7%synergy
Commune with Evil
9.1%inclusion2 decks22 decks
9%synergy
Asinine Antics
9.1%inclusion2 decks22 decks
8%synergy
Fascination
9.1%inclusion2 decks22 decks
9%synergy
Replenish
9.1%inclusion2 decks22 decks
7%synergy
Cut Your Losses
9.1%inclusion2 decks22 decks
9%synergy
Treasure Cruise
9.1%inclusion2 decks22 decks
6%synergy
Starfall Invocation
9.1%inclusion2 decks22 decks
7%synergy
Brilliant Restoration
9.1%inclusion2 decks22 decks
7%synergy
Final Vengeance
9.1%inclusion2 decks22 decks
9%synergy
Unending Whisper
5.3%inclusion1 decks19 decks
5%synergy
Winternight Stories
5.3%inclusion1 decks19 decks
4%synergy
Inspiration from Beyond
5.0%inclusion1 decks20 decks
5%synergy
Utility Artifacts
Keys to the House
14%inclusion3 decks22 decks
13%synergy
Archaeomancer's Map
14%inclusion3 decks22 decks
8%synergy
Mesmeric Orb
9.1%inclusion2 decks22 decks
8%synergy
Matzalantli, the Great Door
9.1%inclusion2 decks22 decks
7%synergy
Wayfarer's Bauble
9.1%inclusion2 decks22 decks
1%synergy
Ghost Vacuum
9.1%inclusion2 decks22 decks
9%synergy
Mask of the Schemer
9.1%inclusion2 decks22 decks
8%synergy
Bident of Thassa
9.1%inclusion2 decks22 decks
0%synergy
The Water Crystal
5.3%inclusion1 decks19 decks
3%synergy
Riverchurn Monument
5.0%inclusion1 decks20 decks
5%synergy
Aether Syphon
5.0%inclusion1 decks20 decks
5%synergy
Enchantments
Propaganda
41%inclusion9 decks22 decks
13%synergy
Cacophony Unleashed
36%inclusion8 decks22 decks
35%synergy
Sigil of the Empty Throne
36%inclusion8 decks22 decks
31%synergy
Central Elevator // Promising Stairs
36%inclusion8 decks22 decks
36%synergy
Seal of Cleansing
36%inclusion8 decks22 decks
35%synergy
Monologue Tax
36%inclusion8 decks22 decks
30%synergy
Animate Dead
36%inclusion8 decks22 decks
27%synergy
Polluted Cistern // Dim Oubliette
36%inclusion8 decks22 decks
36%synergy
Ripples of Undeath
32%inclusion7 decks22 decks
29%synergy
Necromancy
32%inclusion7 decks22 decks
27%synergy
Amphibian Downpour
32%inclusion7 decks22 decks
27%synergy
Restricted Office // Lecture Hall
32%inclusion7 decks22 decks
30%synergy
Nowhere to Run
32%inclusion7 decks22 decks
31%synergy
Mirror Room // Fractured Realm
32%inclusion7 decks22 decks
30%synergy
Ghostly Prison
32%inclusion7 decks22 decks
10%synergy
Stillness in Motion
32%inclusion6 decks19 decks
31%synergy
Imprisoned in the Moon
27%inclusion6 decks22 decks
21%synergy
Unable to Scream
27%inclusion6 decks22 decks
26%synergy
Estrid's Invocation
27%inclusion6 decks22 decks
23%synergy
Mystic Remora
27%inclusion6 decks22 decks
6%synergy
Shark Typhoon
27%inclusion6 decks22 decks
21%synergy
Ethereal Armor
27%inclusion6 decks22 decks
23%synergy
Darksteel Mutation
23%inclusion5 decks22 decks
17%synergy
Cramped Vents // Access Maze
23%inclusion5 decks22 decks
20%synergy
Underwater Tunnel // Slimy Aquarium
23%inclusion5 decks22 decks
22%synergy
Mirrormade
23%inclusion5 decks22 decks
13%synergy
Meat Locker // Drowned Diner
23%inclusion5 decks22 decks
22%synergy
Derelict Attic // Widow's Walk
23%inclusion5 decks22 decks
22%synergy
Starfield of Nyx
23%inclusion5 decks22 decks
19%synergy
Funeral Room // Awakening Hall
23%inclusion5 decks22 decks
22%synergy
All That Glitters
23%inclusion5 decks22 decks
14%synergy
Glasswing Grace
18%inclusion4 decks22 decks
15%synergy
The Eldest Reborn
18%inclusion4 decks22 decks
16%synergy
Chronic Flooding
18%inclusion4 decks22 decks
18%synergy
Surgical Suite // Hospital Room
18%inclusion4 decks22 decks
18%synergy
The Restoration of Eiganjo
18%inclusion4 decks22 decks
18%synergy
Static Prison
18%inclusion4 decks22 decks
18%synergy
Bottomless Pool // Locker Room
18%inclusion4 decks22 decks
16%synergy
Dazzling Theater // Prop Room
18%inclusion4 decks22 decks
17%synergy
Black Market Connections
18%inclusion4 decks22 decks
4%synergy
Seal of Removal
18%inclusion4 decks22 decks
18%synergy
Dance of the Dead
14%inclusion3 decks22 decks
11%synergy
Court of Cunning
14%inclusion3 decks22 decks
13%synergy
Lost in the Maze
14%inclusion3 decks22 decks
13%synergy
Shardmage's Rescue
14%inclusion3 decks22 decks
13%synergy
Utter Insignificance
14%inclusion3 decks22 decks
13%synergy
Soul Snare
14%inclusion3 decks22 decks
13%synergy
Touch the Spirit Realm
14%inclusion3 decks22 decks
11%synergy
Blind Obedience
14%inclusion3 decks22 decks
2%synergy
Timely Ward
14%inclusion3 decks22 decks
9%synergy
Utility Lands
Bojuka Bog
55%inclusion12 decks22 decks
28%synergy
Hall of Heliod's Generosity
45%inclusion10 decks22 decks
32%synergy
Takenuma, Abandoned Mire
18%inclusion4 decks22 decks
12%synergy
Cephalid Coliseum
18%inclusion4 decks22 decks
15%synergy
Halimar Depths
14%inclusion3 decks22 decks
9%synergy
Reliquary Tower
14%inclusion3 decks22 decks
-20%synergy
Otawara, Soaring City
14%inclusion3 decks22 decks
-5%synergy
Nephalia Drownyard
9.1%inclusion2 decks22 decks
9%synergy
Urborg, Tomb of Yawgmoth
9.1%inclusion2 decks22 decks
-4%synergy
Eden, Seat of the Sanctum
5.6%inclusion1 decks18 decks
5%synergy
Ishgard, the Holy See
5.3%inclusion1 decks19 decks
2%synergy
Mana Artifacts
Arcane Signet
86%inclusion19 decks22 decks
-1%synergy
Sol Ring
77%inclusion17 decks22 decks
-13%synergy
Orzhov Signet
59%inclusion13 decks22 decks
26%synergy
Azorius Signet
59%inclusion13 decks22 decks
28%synergy
Dimir Signet
45%inclusion10 decks22 decks
14%synergy
Talisman of Progress
41%inclusion9 decks22 decks
-3%synergy
Talisman of Dominance
27%inclusion6 decks22 decks
-22%synergy
Commander's Sphere
18%inclusion4 decks22 decks
0%synergy
Fellwar Stone
18%inclusion4 decks22 decks
-15%synergy
Talisman of Hierarchy
18%inclusion4 decks22 decks
-26%synergy
Mind Stone
9.1%inclusion2 decks22 decks
-3%synergy
Lands
Island
100%inclusion22 decks22 decks
7%synergy
Command Tower
95%inclusion21 decks22 decks
3%synergy
Swamp
91%inclusion20 decks22 decks
-1%synergy
Plains
91%inclusion20 decks22 decks
-1%synergy
Arcane Sanctum
73%inclusion16 decks22 decks
18%synergy
Exotic Orchard
64%inclusion14 decks22 decks
5%synergy
Adarkar Wastes
55%inclusion12 decks22 decks
23%synergy
Caves of Koilos
50%inclusion11 decks22 decks
14%synergy
Evolving Wilds
50%inclusion11 decks22 decks
25%synergy
Terramorphic Expanse
45%inclusion10 decks22 decks
29%synergy
Temple of Silence
45%inclusion10 decks22 decks
26%synergy
Contaminated Landscape
41%inclusion9 decks22 decks
27%synergy
Prairie Stream
41%inclusion9 decks22 decks
0%synergy
Underground River
41%inclusion9 decks22 decks
7%synergy
Temple of Enlightenment
41%inclusion9 decks22 decks
25%synergy
Temple of Deceit
36%inclusion8 decks22 decks
19%synergy
Valgavoth's Lair
36%inclusion8 decks22 decks
34%synergy
Glacial Fortress
32%inclusion7 decks22 decks
-10%synergy
Isolated Chapel
32%inclusion7 decks22 decks
-8%synergy
Tainted Field
27%inclusion6 decks22 decks
20%synergy
Drowned Catacomb
27%inclusion6 decks22 decks
-10%synergy
Sunken Hollow
27%inclusion6 decks22 decks
-12%synergy
Deserted Beach
27%inclusion6 decks22 decks
6%synergy
Azorius Chancery
23%inclusion5 decks22 decks
9%synergy
Orzhov Basilica
23%inclusion5 decks22 decks
7%synergy
Shineshadow Snarl
23%inclusion5 decks22 decks
12%synergy
Obscura Storefront
23%inclusion5 decks22 decks
13%synergy
Hallowed Fountain
23%inclusion5 decks22 decks
-27%synergy
Tainted Isle
18%inclusion4 decks22 decks
12%synergy
Dimir Aqueduct
18%inclusion4 decks22 decks
5%synergy
Glasswing Grace
18%inclusion4 decks22 decks
15%synergy
Fetid Heath
18%inclusion4 decks22 decks
6%synergy
Port Town
18%inclusion4 decks22 decks
1%synergy
Ash Barrens
18%inclusion4 decks22 decks
7%synergy
Sea of Clouds
18%inclusion4 decks22 decks
-17%synergy
Raffine's Tower
18%inclusion4 decks22 decks
-23%synergy
Godless Shrine
18%inclusion4 decks22 decks
-33%synergy
Skycloud Expanse
18%inclusion4 decks22 decks
3%synergy
Path of Ancestry
18%inclusion4 decks22 decks
-10%synergy
Morphic Pool
18%inclusion4 decks22 decks
-16%synergy
Watery Grave
18%inclusion4 decks22 decks
-32%synergy
Fell the Profane
14%inclusion3 decks22 decks
5%synergy
Myriad Landscape
14%inclusion3 decks22 decks
5%synergy
Irrigated Farmland
14%inclusion3 decks22 decks
6%synergy
Darkwater Catacombs
14%inclusion3 decks22 decks
-1%synergy
Shipwreck Marsh
14%inclusion3 decks22 decks
-7%synergy
Thriving Isle
14%inclusion3 decks22 decks
9%synergy
Boggart Trawler
14%inclusion3 decks22 decks
11%synergy
Sink into Stupor
14%inclusion3 decks22 decks
1%synergy
Thriving Moor
14%inclusion3 decks22 decks
9%synergy
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