The Master of Keys (Commander) - Core Mill

The Master of Keys
Rank #300
25decks
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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
Mana Artifacts
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Killian, Decisive Mentor
13%inclusion1 decks8 decks
12%synergy
Dimensional Exile
13%inclusion1 decks8 decks
12%synergy
Retro-Mutation
13%inclusion1 decks8 decks
12%synergy
High Synergy Cards
Inquisitive Glimmer
88%inclusion22 decks25 decks
81%synergy
Starfield Mystic
76%inclusion19 decks25 decks
70%synergy
Doomwake Giant
68%inclusion17 decks25 decks
62%synergy
Entity Tracker
68%inclusion17 decks25 decks
62%synergy
Fear of Impostors
60%inclusion15 decks25 decks
59%synergy
Scrabbling Skullcrab
56%inclusion14 decks25 decks
55%synergy
Mesa Enchantress
60%inclusion15 decks25 decks
51%synergy
Demon of Fate's Design
56%inclusion14 decks25 decks
51%synergy
Victor, Valgavoth's Seneschal
52%inclusion13 decks25 decks
50%synergy
The Tale of Tamiyo
48%inclusion12 decks25 decks
48%synergy
Top Cards
Grasp of Fate
48%inclusion12 decks25 decks
42%synergy
Cemetery Tampering
48%inclusion12 decks25 decks
47%synergy
Defiled Crypt // Cadaver Lab
48%inclusion12 decks25 decks
47%synergy
Gravebreaker Lamia
44%inclusion11 decks25 decks
43%synergy
Fear of Sleep Paralysis
44%inclusion11 decks25 decks
39%synergy
Dress Down
44%inclusion11 decks25 decks
42%synergy
Seal of Cleansing
40%inclusion10 decks25 decks
39%synergy
Swords to Plowshares
40%inclusion10 decks25 decks
-28%synergy
Ghostly Dancers
40%inclusion10 decks25 decks
38%synergy
Propaganda
40%inclusion10 decks25 decks
12%synergy
Creatures
Silent Hallcreeper
36%inclusion9 decks25 decks
31%synergy
Aminatou, Veil Piercer
36%inclusion9 decks25 decks
35%synergy
Zur, Eternal Schemer
36%inclusion9 decks25 decks
33%synergy
Ondu Spiritdancer
36%inclusion9 decks25 decks
30%synergy
Overlord of the Floodpits
32%inclusion8 decks25 decks
28%synergy
Soaring Lightbringer
32%inclusion8 decks25 decks
27%synergy
Heliod, the Radiant Dawn
32%inclusion8 decks25 decks
28%synergy
Overlord of the Balemurk
28%inclusion7 decks25 decks
26%synergy
Enduring Curiosity
28%inclusion7 decks25 decks
20%synergy
Fear of Surveillance
24%inclusion6 decks25 decks
24%synergy
Skullsnap Nuisance
24%inclusion6 decks25 decks
24%synergy
Alseid of Life's Bounty
24%inclusion6 decks25 decks
23%synergy
Mindwrack Harpy
24%inclusion6 decks25 decks
24%synergy
Moon-Blessed Cleric
20%inclusion5 decks25 decks
15%synergy
Spirited Companion
20%inclusion5 decks25 decks
18%synergy
Archetype of Imagination
20%inclusion5 decks25 decks
15%synergy
Creeping Peeper
20%inclusion5 decks25 decks
20%synergy
Zur the Enchanter
20%inclusion5 decks25 decks
15%synergy
Starnheim Courser
16%inclusion4 decks25 decks
12%synergy
Overlord of the Mistmoors
16%inclusion4 decks25 decks
14%synergy
Appendage Amalgam
16%inclusion4 decks25 decks
16%synergy
Nashi, Searcher in the Dark
16%inclusion4 decks25 decks
15%synergy
Nightmare Shepherd
16%inclusion4 decks25 decks
14%synergy
Grim Guardian
16%inclusion4 decks25 decks
14%synergy
Stenn, Paranoid Partisan
12%inclusion3 decks25 decks
11%synergy
Phenax, God of Deception
12%inclusion3 decks25 decks
12%synergy
Lotho, Corrupt Shirriff
12%inclusion3 decks25 decks
-5%synergy
The Mindskinner
12%inclusion3 decks25 decks
11%synergy
Archon of Sun's Grace
12%inclusion3 decks25 decks
8%synergy
Sage of Mysteries
12%inclusion3 decks25 decks
12%synergy
Ashiok's Reaper
12%inclusion3 decks25 decks
12%synergy
Boggart Trawler
12%inclusion3 decks25 decks
9%synergy
Athreos, Shroud-Veiled
12%inclusion3 decks25 decks
8%synergy
Ancient Cellarspawn
12%inclusion3 decks25 decks
9%synergy
Abdel Adrian, Gorion's Ward
12%inclusion3 decks25 decks
10%synergy
Twilight Diviner
10%inclusion1 decks10 decks
9%synergy
Summon: Primal Odin
9.1%inclusion2 decks22 decks
5%synergy
Summon: Yojimbo
9.1%inclusion2 decks22 decks
8%synergy
Hope Estheim
9.1%inclusion2 decks22 decks
8%synergy
Eidolon of Astral Winds
8.7%inclusion2 decks23 decks
9%synergy
Fear of Infinity
8.0%inclusion2 decks25 decks
7%synergy
Witch Enchanter
8.0%inclusion2 decks25 decks
1%synergy
Wall of Reverence
8.0%inclusion2 decks25 decks
7%synergy
Fear of Isolation
8.0%inclusion2 decks25 decks
8%synergy
Mulldrifter
8.0%inclusion2 decks25 decks
4%synergy
Fear of Failed Tests
8.0%inclusion2 decks25 decks
8%synergy
Fear of Lost Teeth
8.0%inclusion2 decks25 decks
8%synergy
Zellix, Sanity Flayer
8.0%inclusion2 decks25 decks
8%synergy
Hydroelectric Specimen
8.0%inclusion2 decks25 decks
5%synergy
The Ancient One
8.0%inclusion2 decks25 decks
8%synergy
Instants
Thirst for Meaning
36%inclusion9 decks25 decks
35%synergy
Otherworldly Gaze
36%inclusion9 decks25 decks
34%synergy
Counterspell
32%inclusion8 decks25 decks
-10%synergy
Path to Exile
32%inclusion8 decks25 decks
-10%synergy
Arcane Denial
28%inclusion7 decks25 decks
8%synergy
Frantic Search
24%inclusion6 decks25 decks
6%synergy
Swallowed by Leviathan
19%inclusion4 decks21 decks
19%synergy
Negate
16%inclusion4 decks25 decks
0%synergy
Dreams of Laguna
14%inclusion3 decks22 decks
13%synergy
Fell the Profane
12%inclusion3 decks25 decks
3%synergy
Drown in the Loch
12%inclusion3 decks25 decks
10%synergy
Dovin's Veto
12%inclusion3 decks25 decks
-14%synergy
An Offer You Can't Refuse
12%inclusion3 decks25 decks
-15%synergy
Dark Ritual
12%inclusion3 decks25 decks
-8%synergy
Void Rend
12%inclusion3 decks25 decks
-23%synergy
Swan Song
12%inclusion3 decks25 decks
-8%synergy
Faithful Mending
12%inclusion3 decks25 decks
8%synergy
Sink into Stupor
12%inclusion3 decks25 decks
-1%synergy
Inkshield
12%inclusion3 decks25 decks
2%synergy
Generous Gift
12%inclusion3 decks25 decks
-2%synergy
Entomb
8.0%inclusion2 decks25 decks
1%synergy
Return to Dust
8.0%inclusion2 decks25 decks
5%synergy
Dawn's Truce
8.0%inclusion2 decks25 decks
4%synergy
Fact or Fiction
8.0%inclusion2 decks25 decks
4%synergy
Infernal Grasp
8.0%inclusion2 decks25 decks
7%synergy
Get Out
8.0%inclusion2 decks25 decks
8%synergy
Utter End
8.0%inclusion2 decks25 decks
2%synergy
Drown in Dreams
8.0%inclusion2 decks25 decks
8%synergy
Sejiri Shelter
8.0%inclusion2 decks25 decks
6%synergy
Live or Die
8.0%inclusion2 decks25 decks
8%synergy
Waterlogged Teachings
8.0%inclusion2 decks25 decks
3%synergy
Dig Through Time
8.0%inclusion2 decks25 decks
2%synergy
Amazing Acrobatics
5.9%inclusion1 decks17 decks
5%synergy
Sorceries
Redress Fate
36%inclusion9 decks25 decks
30%synergy
Singularity Rupture
32%inclusion6 decks19 decks
29%synergy
Space-Time Anomaly
32%inclusion6 decks19 decks
30%synergy
Dance of the Manse
28%inclusion7 decks25 decks
25%synergy
Windfall
20%inclusion5 decks25 decks
7%synergy
Sevinne's Reclamation
20%inclusion5 decks25 decks
11%synergy
Reanimate
20%inclusion5 decks25 decks
4%synergy
Extinguish All Hope
20%inclusion5 decks25 decks
18%synergy
Resurgent Belief
16%inclusion4 decks25 decks
14%synergy
Time Wipe
16%inclusion4 decks25 decks
9%synergy
Glimpse the Unthinkable
16%inclusion4 decks25 decks
16%synergy
Demonic Counsel
16%inclusion4 decks25 decks
15%synergy
Damn
12%inclusion3 decks25 decks
-8%synergy
Commune with Evil
8.0%inclusion2 decks25 decks
8%synergy
Asinine Antics
8.0%inclusion2 decks25 decks
7%synergy
Fascination
8.0%inclusion2 decks25 decks
8%synergy
Bond of Insight
8.0%inclusion2 decks25 decks
8%synergy
Replenish
8.0%inclusion2 decks25 decks
6%synergy
Cut Your Losses
8.0%inclusion2 decks25 decks
8%synergy
Treasure Cruise
8.0%inclusion2 decks25 decks
5%synergy
Starfall Invocation
8.0%inclusion2 decks25 decks
6%synergy
Brilliant Restoration
8.0%inclusion2 decks25 decks
6%synergy
Rite of the Moth
8.0%inclusion2 decks25 decks
8%synergy
Final Vengeance
8.0%inclusion2 decks25 decks
8%synergy
Utility Artifacts
Keys to the House
12%inclusion3 decks25 decks
12%synergy
Archaeomancer's Map
12%inclusion3 decks25 decks
6%synergy
Mesmeric Orb
8.0%inclusion2 decks25 decks
7%synergy
Matzalantli, the Great Door
8.0%inclusion2 decks25 decks
6%synergy
Wayfarer's Bauble
8.0%inclusion2 decks25 decks
1%synergy
Ghost Vacuum
8.0%inclusion2 decks25 decks
8%synergy
Mask of the Schemer
8.0%inclusion2 decks25 decks
7%synergy
Bident of Thassa
8.0%inclusion2 decks25 decks
-1%synergy
Enchantments
Cacophony Unleashed
36%inclusion9 decks25 decks
34%synergy
Sigil of the Empty Throne
36%inclusion9 decks25 decks
30%synergy
Sphere of Safety
36%inclusion9 decks25 decks
27%synergy
Monologue Tax
36%inclusion9 decks25 decks
30%synergy
Animate Dead
36%inclusion9 decks25 decks
26%synergy
Secret Arcade // Dusty Parlor
36%inclusion9 decks25 decks
31%synergy
Ripples of Undeath
32%inclusion8 decks25 decks
29%synergy
Necromancy
32%inclusion8 decks25 decks
27%synergy
Estrid's Invocation
32%inclusion8 decks25 decks
27%synergy
Shark Typhoon
32%inclusion8 decks25 decks
26%synergy
Central Elevator // Promising Stairs
32%inclusion8 decks25 decks
31%synergy
Amphibian Downpour
32%inclusion8 decks25 decks
27%synergy
Polluted Cistern // Dim Oubliette
32%inclusion8 decks25 decks
31%synergy
Ethereal Armor
32%inclusion8 decks25 decks
27%synergy
Stillness in Motion
32%inclusion7 decks22 decks
31%synergy
Darksteel Mutation
28%inclusion7 decks25 decks
22%synergy
Mirrormade
28%inclusion7 decks25 decks
18%synergy
All That Glitters
28%inclusion7 decks25 decks
19%synergy
Restricted Office // Lecture Hall
28%inclusion7 decks25 decks
26%synergy
Nowhere to Run
28%inclusion7 decks25 decks
27%synergy
Mirror Room // Fractured Realm
28%inclusion7 decks25 decks
26%synergy
Ghostly Prison
28%inclusion7 decks25 decks
6%synergy
Imprisoned in the Moon
24%inclusion6 decks25 decks
17%synergy
Mystic Remora
24%inclusion6 decks25 decks
3%synergy
Cramped Vents // Access Maze
20%inclusion5 decks25 decks
18%synergy
Underwater Tunnel // Slimy Aquarium
20%inclusion5 decks25 decks
20%synergy
Unable to Scream
20%inclusion5 decks25 decks
19%synergy
The Eldest Reborn
20%inclusion5 decks25 decks
18%synergy
Meat Locker // Drowned Diner
20%inclusion5 decks25 decks
20%synergy
Derelict Attic // Widow's Walk
20%inclusion5 decks25 decks
20%synergy
Starfield of Nyx
20%inclusion5 decks25 decks
16%synergy
Funeral Room // Awakening Hall
20%inclusion5 decks25 decks
19%synergy
Seal of Removal
20%inclusion5 decks25 decks
19%synergy
Dance of the Dead
16%inclusion4 decks25 decks
14%synergy
Glasswing Grace
16%inclusion4 decks25 decks
13%synergy
Extravagant Replication
16%inclusion4 decks25 decks
11%synergy
Chronic Flooding
16%inclusion4 decks25 decks
16%synergy
Touch the Spirit Realm
16%inclusion4 decks25 decks
14%synergy
Surgical Suite // Hospital Room
16%inclusion4 decks25 decks
16%synergy
Timely Ward
16%inclusion4 decks25 decks
11%synergy
The Restoration of Eiganjo
16%inclusion4 decks25 decks
15%synergy
Static Prison
16%inclusion4 decks25 decks
16%synergy
Secrets of the Dead
16%inclusion4 decks25 decks
16%synergy
Bottomless Pool // Locker Room
16%inclusion4 decks25 decks
14%synergy
Dazzling Theater // Prop Room
16%inclusion4 decks25 decks
15%synergy
Sheltered by Ghosts
16%inclusion4 decks25 decks
13%synergy
Black Market Connections
16%inclusion4 decks25 decks
1%synergy
Court of Cunning
12%inclusion3 decks25 decks
11%synergy
Lost in the Maze
12%inclusion3 decks25 decks
12%synergy
Shardmage's Rescue
12%inclusion3 decks25 decks
12%synergy
Battles
Invasion of Theros
8.0%inclusion2 decks25 decks
6%synergy
Utility Lands
Bojuka Bog
48%inclusion12 decks25 decks
21%synergy
Hall of Heliod's Generosity
40%inclusion10 decks25 decks
27%synergy
Takenuma, Abandoned Mire
16%inclusion4 decks25 decks
10%synergy
Cephalid Coliseum
16%inclusion4 decks25 decks
12%synergy
Halimar Depths
12%inclusion3 decks25 decks
7%synergy
Reliquary Tower
12%inclusion3 decks25 decks
-22%synergy
Otawara, Soaring City
12%inclusion3 decks25 decks
-7%synergy
Nephalia Drownyard
8.0%inclusion2 decks25 decks
8%synergy
Emergence Zone
8.0%inclusion2 decks25 decks
6%synergy
Urborg, Tomb of Yawgmoth
8.0%inclusion2 decks25 decks
-5%synergy
Mana Artifacts
Arcane Signet
88%inclusion22 decks25 decks
0%synergy
Sol Ring
80%inclusion20 decks25 decks
-10%synergy
Orzhov Signet
56%inclusion14 decks25 decks
24%synergy
Azorius Signet
56%inclusion14 decks25 decks
26%synergy
Talisman of Progress
40%inclusion10 decks25 decks
-4%synergy
Dimir Signet
40%inclusion10 decks25 decks
9%synergy
Talisman of Dominance
24%inclusion6 decks25 decks
-26%synergy
Talisman of Hierarchy
24%inclusion6 decks25 decks
-20%synergy
Fellwar Stone
20%inclusion5 decks25 decks
-13%synergy
Commander's Sphere
16%inclusion4 decks25 decks
-2%synergy
Mind Stone
8.0%inclusion2 decks25 decks
-4%synergy
Lands
Island
100%inclusion25 decks25 decks
7%synergy
Command Tower
96%inclusion24 decks25 decks
3%synergy
Swamp
92%inclusion23 decks25 decks
0%synergy
Plains
92%inclusion23 decks25 decks
0%synergy
Arcane Sanctum
72%inclusion18 decks25 decks
18%synergy
Exotic Orchard
64%inclusion16 decks25 decks
5%synergy
Adarkar Wastes
60%inclusion15 decks25 decks
28%synergy
Caves of Koilos
56%inclusion14 decks25 decks
20%synergy
Underground River
52%inclusion13 decks25 decks
18%synergy
Evolving Wilds
52%inclusion13 decks25 decks
27%synergy
Terramorphic Expanse
44%inclusion11 decks25 decks
28%synergy
Prairie Stream
44%inclusion11 decks25 decks
3%synergy
Temple of Silence
44%inclusion11 decks25 decks
25%synergy
Valgavoth's Lair
40%inclusion10 decks25 decks
37%synergy
Temple of Enlightenment
40%inclusion10 decks25 decks
24%synergy
Glacial Fortress
36%inclusion9 decks25 decks
-6%synergy
Contaminated Landscape
36%inclusion9 decks25 decks
22%synergy
Isolated Chapel
36%inclusion9 decks25 decks
-5%synergy
Temple of Deceit
32%inclusion8 decks25 decks
15%synergy
Tainted Field
32%inclusion8 decks25 decks
25%synergy
Drowned Catacomb
28%inclusion7 decks25 decks
-10%synergy
Sunken Hollow
28%inclusion7 decks25 decks
-12%synergy
Deserted Beach
28%inclusion7 decks25 decks
7%synergy
Fetid Heath
24%inclusion6 decks25 decks
11%synergy
Hallowed Fountain
24%inclusion6 decks25 decks
-27%synergy
Tainted Isle
20%inclusion5 decks25 decks
14%synergy
Azorius Chancery
20%inclusion5 decks25 decks
6%synergy
Ash Barrens
20%inclusion5 decks25 decks
9%synergy
Godless Shrine
20%inclusion5 decks25 decks
-31%synergy
Orzhov Basilica
20%inclusion5 decks25 decks
5%synergy
Shineshadow Snarl
20%inclusion5 decks25 decks
9%synergy
Obscura Storefront
20%inclusion5 decks25 decks
10%synergy
Watery Grave
20%inclusion5 decks25 decks
-31%synergy
Dimir Aqueduct
16%inclusion4 decks25 decks
3%synergy
Glasswing Grace
16%inclusion4 decks25 decks
13%synergy
Port Town
16%inclusion4 decks25 decks
-1%synergy
Shipwreck Marsh
16%inclusion4 decks25 decks
-5%synergy
Sea of Clouds
16%inclusion4 decks25 decks
-19%synergy
Raffine's Tower
16%inclusion4 decks25 decks
-25%synergy
Skycloud Expanse
16%inclusion4 decks25 decks
1%synergy
Path of Ancestry
16%inclusion4 decks25 decks
-12%synergy
Morphic Pool
16%inclusion4 decks25 decks
-18%synergy
Shattered Sanctum
16%inclusion4 decks25 decks
-1%synergy
Fell the Profane
12%inclusion3 decks25 decks
3%synergy
Undercity Sewers
12%inclusion3 decks25 decks
-3%synergy
Myriad Landscape
12%inclusion3 decks25 decks
4%synergy
Irrigated Farmland
12%inclusion3 decks25 decks
5%synergy
Darkwater Catacombs
12%inclusion3 decks25 decks
-3%synergy
Thriving Isle
12%inclusion3 decks25 decks
8%synergy
Boggart Trawler
12%inclusion3 decks25 decks
9%synergy
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