The Master of Keys (Commander) - Upgraded Self-Mill

The Master of Keys
Rank #306
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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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Inquisitive Glimmer
97%inclusion28 decks29 decks
89%synergy
Ripples of Undeath
83%inclusion24 decks29 decks
80%synergy
Mesa Enchantress
79%inclusion23 decks29 decks
70%synergy
Entity Tracker
76%inclusion22 decks29 decks
70%synergy
Starfield Mystic
76%inclusion22 decks29 decks
69%synergy
Hall of Heliod's Generosity
79%inclusion23 decks29 decks
66%synergy
Fear of Sleep Paralysis
69%inclusion20 decks29 decks
64%synergy
Demon of Fate's Design
69%inclusion20 decks29 decks
64%synergy
Doomwake Giant
69%inclusion20 decks29 decks
63%synergy
Gravebreaker Lamia
62%inclusion18 decks29 decks
61%synergy
Top Cards
Animate Dead
69%inclusion20 decks29 decks
59%synergy
Scrabbling Skullcrab
62%inclusion18 decks29 decks
61%synergy
Grasp of Fate
62%inclusion18 decks29 decks
56%synergy
Overlord of the Floodpits
55%inclusion16 decks29 decks
52%synergy
Secret Arcade // Dusty Parlor
55%inclusion16 decks29 decks
50%synergy
Zur, Eternal Schemer
55%inclusion16 decks29 decks
52%synergy
Sevinne's Reclamation
52%inclusion15 decks29 decks
43%synergy
Fear of Impostors
52%inclusion15 decks29 decks
50%synergy
Victor, Valgavoth's Seneschal
52%inclusion15 decks29 decks
50%synergy
Cemetery Tampering
52%inclusion15 decks29 decks
51%synergy
Game Changers
Smothering Tithe
28%inclusion8 decks29 decks
-4%synergy
Rhystic Study
24%inclusion7 decks29 decks
-8%synergy
Demonic Tutor
6.9%inclusion2 decks29 decks
-14%synergy
Creatures
Overlord of the Balemurk
45%inclusion13 decks29 decks
43%synergy
Ghostly Dancers
38%inclusion11 decks29 decks
35%synergy
Ondu Spiritdancer
38%inclusion11 decks29 decks
32%synergy
Zur the Enchanter
38%inclusion11 decks29 decks
33%synergy
Soaring Lightbringer
34%inclusion10 decks29 decks
30%synergy
Skullsnap Nuisance
34%inclusion10 decks29 decks
34%synergy
Archon of Sun's Grace
31%inclusion9 decks29 decks
26%synergy
Ancient Cellarspawn
28%inclusion8 decks29 decks
24%synergy
Grim Guardian
28%inclusion8 decks29 decks
25%synergy
Mindwrack Harpy
28%inclusion8 decks29 decks
27%synergy
Sage of Mysteries
24%inclusion7 decks29 decks
24%synergy
Enduring Curiosity
21%inclusion6 decks29 decks
13%synergy
Archetype of Imagination
21%inclusion6 decks29 decks
16%synergy
Alseid of Life's Bounty
21%inclusion6 decks29 decks
19%synergy
Stenn, Paranoid Partisan
17%inclusion5 decks29 decks
16%synergy
Silent Hallcreeper
17%inclusion5 decks29 decks
13%synergy
Hedron Crab
17%inclusion5 decks29 decks
17%synergy
Overlord of the Mistmoors
17%inclusion5 decks29 decks
15%synergy
Balemurk Leech
17%inclusion5 decks29 decks
17%synergy
Heliod, the Radiant Dawn
17%inclusion5 decks29 decks
14%synergy
Hullbreaker Horror
17%inclusion5 decks29 decks
11%synergy
Starnheim Courser
14%inclusion4 decks29 decks
10%synergy
Witch Enchanter
14%inclusion4 decks29 decks
7%synergy
Spirited Companion
14%inclusion4 decks29 decks
12%synergy
Gremlin Tamer
14%inclusion4 decks29 decks
13%synergy
Laboratory Maniac
14%inclusion4 decks29 decks
11%synergy
Aminatou, Veil Piercer
14%inclusion4 decks29 decks
12%synergy
Abdel Adrian, Gorion's Ward
14%inclusion4 decks29 decks
12%synergy
Emet-Selch of the Third Seat
12%inclusion3 decks26 decks
2%synergy
Lotho, Corrupt Shirriff
10%inclusion3 decks29 decks
-7%synergy
Protean Thaumaturge
10%inclusion3 decks29 decks
10%synergy
Moon-Blessed Cleric
10%inclusion3 decks29 decks
6%synergy
Creeping Peeper
10%inclusion3 decks29 decks
10%synergy
Nashi, Searcher in the Dark
10%inclusion3 decks29 decks
10%synergy
Millikin
10%inclusion3 decks29 decks
10%synergy
Fear of Infinity
6.9%inclusion2 decks29 decks
6%synergy
Phenax, God of Deception
6.9%inclusion2 decks29 decks
7%synergy
Displacer Kitten
6.9%inclusion2 decks29 decks
0%synergy
Syr Konrad, the Grim
6.9%inclusion2 decks29 decks
1%synergy
High Fae Trickster
6.9%inclusion2 decks29 decks
2%synergy
Fear of Failed Tests
6.9%inclusion2 decks29 decks
6%synergy
Hanna, Ship's Navigator
6.9%inclusion2 decks29 decks
5%synergy
Doom Whisperer
6.9%inclusion2 decks29 decks
5%synergy
Fear of Surveillance
6.9%inclusion2 decks29 decks
7%synergy
Hydroelectric Specimen
6.9%inclusion2 decks29 decks
4%synergy
Stitcher's Supplier
6.9%inclusion2 decks29 decks
6%synergy
Angel of Suffering
6.9%inclusion2 decks29 decks
7%synergy
Vega, the Watcher
6.9%inclusion2 decks29 decks
5%synergy
Athreos, Shroud-Veiled
6.9%inclusion2 decks29 decks
3%synergy
Arvinox, the Mind Flail
6.9%inclusion2 decks29 decks
5%synergy
Instants
Swords to Plowshares
38%inclusion11 decks29 decks
-30%synergy
An Offer You Can't Refuse
34%inclusion10 decks29 decks
7%synergy
Void Rend
28%inclusion8 decks29 decks
-7%synergy
Counterspell
28%inclusion8 decks29 decks
-14%synergy
Entomb
24%inclusion7 decks29 decks
17%synergy
Thirst for Meaning
24%inclusion7 decks29 decks
23%synergy
Arcane Denial
21%inclusion6 decks29 decks
0%synergy
Path to Exile
21%inclusion6 decks29 decks
-21%synergy
Frantic Search
17%inclusion5 decks29 decks
0%synergy
Dovin's Veto
17%inclusion5 decks29 decks
-8%synergy
Dark Ritual
14%inclusion4 decks29 decks
-6%synergy
Faithful Mending
14%inclusion4 decks29 decks
10%synergy
Fell the Profane
10%inclusion3 decks29 decks
2%synergy
Negate
10%inclusion3 decks29 decks
-6%synergy
Swan Song
10%inclusion3 decks29 decks
-9%synergy
Sink into Stupor
10%inclusion3 decks29 decks
-2%synergy
Inkshield
10%inclusion3 decks29 decks
1%synergy
Return to Dust
6.9%inclusion2 decks29 decks
3%synergy
Fact or Fiction
6.9%inclusion2 decks29 decks
3%synergy
Anguished Unmaking
6.9%inclusion2 decks29 decks
-18%synergy
Otherworldly Gaze
6.9%inclusion2 decks29 decks
5%synergy
Utter End
6.9%inclusion2 decks29 decks
0%synergy
Withering Torment
6.9%inclusion2 decks29 decks
5%synergy
Sorceries
Singularity Rupture
35%inclusion8 decks23 decks
32%synergy
Redress Fate
34%inclusion10 decks29 decks
29%synergy
Windfall
31%inclusion9 decks29 decks
17%synergy
Extinguish All Hope
31%inclusion9 decks29 decks
29%synergy
Time Wipe
28%inclusion8 decks29 decks
21%synergy
Dance of the Manse
28%inclusion8 decks29 decks
24%synergy
Reanimate
21%inclusion6 decks29 decks
5%synergy
Idyllic Tutor
17%inclusion5 decks29 decks
13%synergy
Glimpse the Unthinkable
14%inclusion4 decks29 decks
13%synergy
Toxic Deluge
14%inclusion4 decks29 decks
-6%synergy
Supreme Verdict
10%inclusion3 decks29 decks
-5%synergy
Unmarked Grave
10%inclusion3 decks29 decks
9%synergy
Demonic Counsel
10%inclusion3 decks29 decks
9%synergy
Brilliant Restoration
10%inclusion3 decks29 decks
8%synergy
Space-Time Anomaly
8.7%inclusion2 decks23 decks
7%synergy
Ponder
6.9%inclusion2 decks29 decks
-2%synergy
Austere Command
6.9%inclusion2 decks29 decks
-2%synergy
Open the Vaults
6.9%inclusion2 decks29 decks
6%synergy
Victimize
6.9%inclusion2 decks29 decks
-2%synergy
Replenish
6.9%inclusion2 decks29 decks
5%synergy
Feed the Swarm
6.9%inclusion2 decks29 decks
4%synergy
Rite of the Moth
6.9%inclusion2 decks29 decks
7%synergy
Damn
6.9%inclusion2 decks29 decks
-14%synergy
Suppression Ray
6.9%inclusion2 decks29 decks
6%synergy
Zombify
6.9%inclusion2 decks29 decks
7%synergy
Stargaze
6.9%inclusion2 decks29 decks
7%synergy
Rise of the Dark Realms
6.9%inclusion2 decks29 decks
4%synergy
Breach the Multiverse
6.9%inclusion2 decks29 decks
5%synergy
Avatar's Wrath
5.3%inclusion1 decks19 decks
3%synergy
Utility Artifacts
Mesmeric Orb
21%inclusion6 decks29 decks
20%synergy
Wayfarer's Bauble
21%inclusion6 decks29 decks
13%synergy
Cloud Key
14%inclusion4 decks29 decks
11%synergy
Perpetual Timepiece
6.9%inclusion2 decks29 decks
7%synergy
The Everflowing Well
6.9%inclusion2 decks29 decks
6%synergy
Keys to the House
6.9%inclusion2 decks29 decks
7%synergy
Palantír of Orthanc
6.9%inclusion2 decks29 decks
6%synergy
Swiftfoot Boots
6.9%inclusion2 decks29 decks
-17%synergy
Lightning Greaves
6.9%inclusion2 decks29 decks
-16%synergy
Codex Shredder
6.9%inclusion2 decks29 decks
7%synergy
The Fire Nation Drill
5.0%inclusion1 decks20 decks
5%synergy
Enchantments
Seal of Cleansing
52%inclusion15 decks29 decks
50%synergy
Estrid's Invocation
48%inclusion14 decks29 decks
44%synergy
Dress Down
48%inclusion14 decks29 decks
46%synergy
Necromancy
45%inclusion13 decks29 decks
40%synergy
Mirrormade
45%inclusion13 decks29 decks
35%synergy
Mystic Remora
45%inclusion13 decks29 decks
24%synergy
Amphibian Downpour
41%inclusion12 decks29 decks
37%synergy
Ghostly Prison
41%inclusion12 decks29 decks
19%synergy
Darksteel Mutation
38%inclusion11 decks29 decks
32%synergy
Starfield of Nyx
38%inclusion11 decks29 decks
34%synergy
Sphere of Safety
38%inclusion11 decks29 decks
28%synergy
The Tale of Tamiyo
38%inclusion11 decks29 decks
37%synergy
Cacophony Unleashed
34%inclusion10 decks29 decks
33%synergy
Sigil of the Empty Throne
34%inclusion10 decks29 decks
29%synergy
Restricted Office // Lecture Hall
34%inclusion10 decks29 decks
32%synergy
Polluted Cistern // Dim Oubliette
34%inclusion10 decks29 decks
34%synergy
Propaganda
34%inclusion10 decks29 decks
7%synergy
Stillness in Motion
33%inclusion9 decks27 decks
33%synergy
Blind Obedience
31%inclusion9 decks29 decks
19%synergy
All That Glitters
31%inclusion9 decks29 decks
22%synergy
Monologue Tax
31%inclusion9 decks29 decks
25%synergy
Ethereal Armor
31%inclusion9 decks29 decks
26%synergy
Court of Cunning
28%inclusion8 decks29 decks
27%synergy
Touch the Spirit Realm
24%inclusion7 decks29 decks
22%synergy
Copy Enchantment
24%inclusion7 decks29 decks
19%synergy
Central Elevator // Promising Stairs
24%inclusion7 decks29 decks
23%synergy
Defiled Crypt // Cadaver Lab
24%inclusion7 decks29 decks
23%synergy
Imprisoned in the Moon
21%inclusion6 decks29 decks
14%synergy
Glasswing Grace
21%inclusion6 decks29 decks
18%synergy
Extravagant Replication
21%inclusion6 decks29 decks
16%synergy
Out of the Tombs
21%inclusion6 decks29 decks
20%synergy
Leyline of Anticipation
21%inclusion6 decks29 decks
16%synergy
Secrets of the Dead
21%inclusion6 decks29 decks
20%synergy
Sheltered by Ghosts
21%inclusion6 decks29 decks
18%synergy
Mirror Room // Fractured Realm
21%inclusion6 decks29 decks
18%synergy
Seal of Removal
21%inclusion6 decks29 decks
20%synergy
Dance of the Dead
17%inclusion5 decks29 decks
15%synergy
Cramped Vents // Access Maze
17%inclusion5 decks29 decks
15%synergy
Shark Typhoon
17%inclusion5 decks29 decks
11%synergy
Timely Ward
17%inclusion5 decks29 decks
12%synergy
Nowhere to Run
17%inclusion5 decks29 decks
16%synergy
Search for Azcanta
17%inclusion5 decks29 decks
16%synergy
Teval's Judgment
14%inclusion4 decks28 decks
13%synergy
The Eldest Reborn
14%inclusion4 decks29 decks
11%synergy
Chronic Flooding
14%inclusion4 decks29 decks
14%synergy
Authority of the Consuls
14%inclusion4 decks29 decks
2%synergy
Funeral Room // Awakening Hall
14%inclusion4 decks29 decks
13%synergy
Static Prison
14%inclusion4 decks29 decks
13%synergy
Bottomless Pool // Locker Room
14%inclusion4 decks29 decks
12%synergy
Copy Land
14%inclusion4 decks29 decks
13%synergy
Battles
Invasion of Theros
14%inclusion4 decks29 decks
12%synergy
Planeswalkers
Jace, the Perfected Mind
6.9%inclusion2 decks29 decks
7%synergy
Utility Lands
Bojuka Bog
48%inclusion14 decks29 decks
21%synergy
Takenuma, Abandoned Mire
21%inclusion6 decks29 decks
14%synergy
Cephalid Coliseum
21%inclusion6 decks29 decks
17%synergy
Otawara, Soaring City
17%inclusion5 decks29 decks
-2%synergy
Nephalia Drownyard
14%inclusion4 decks29 decks
13%synergy
Reliquary Tower
14%inclusion4 decks29 decks
-20%synergy
Restless Reef
10%inclusion3 decks29 decks
9%synergy
Lotus Field
6.9%inclusion2 decks29 decks
6%synergy
Roadside Reliquary
6.9%inclusion2 decks29 decks
6%synergy
Halimar Depths
6.9%inclusion2 decks29 decks
2%synergy
Lonely Sandbar
6.9%inclusion2 decks29 decks
5%synergy
Secluded Steppe
6.9%inclusion2 decks29 decks
5%synergy
Dakmor Salvage
6.9%inclusion2 decks29 decks
7%synergy
Temple of the False God
6.9%inclusion2 decks29 decks
-1%synergy
Rogue's Passage
6.9%inclusion2 decks29 decks
-3%synergy
Mana Artifacts
Arcane Signet
90%inclusion26 decks29 decks
2%synergy
Sol Ring
90%inclusion26 decks29 decks
0%synergy
Azorius Signet
41%inclusion12 decks29 decks
10%synergy
Talisman of Progress
38%inclusion11 decks29 decks
-6%synergy
Talisman of Dominance
38%inclusion11 decks29 decks
-12%synergy
Fellwar Stone
34%inclusion10 decks29 decks
1%synergy
Talisman of Hierarchy
34%inclusion10 decks29 decks
-9%synergy
Orzhov Signet
34%inclusion10 decks29 decks
1%synergy
Mind Stone
24%inclusion7 decks29 decks
12%synergy
Dimir Signet
21%inclusion6 decks29 decks
-11%synergy
Commander's Sphere
10%inclusion3 decks29 decks
-8%synergy
Bender's Waterskin
8.7%inclusion2 decks23 decks
4%synergy
Sky Diamond
6.9%inclusion2 decks29 decks
6%synergy
Chromatic Lantern
6.9%inclusion2 decks29 decks
-6%synergy
Marble Diamond
6.9%inclusion2 decks29 decks
6%synergy
Lands
Command Tower
100%inclusion29 decks29 decks
7%synergy
Swamp
100%inclusion29 decks29 decks
9%synergy
Island
100%inclusion29 decks29 decks
7%synergy
Plains
100%inclusion29 decks29 decks
8%synergy
Arcane Sanctum
66%inclusion19 decks29 decks
11%synergy
Exotic Orchard
59%inclusion17 decks29 decks
0%synergy
Caves of Koilos
59%inclusion17 decks29 decks
23%synergy
Adarkar Wastes
59%inclusion17 decks29 decks
27%synergy
Glacial Fortress
55%inclusion16 decks29 decks
14%synergy
Underground River
52%inclusion15 decks29 decks
18%synergy
Valgavoth's Lair
48%inclusion14 decks29 decks
46%synergy
Isolated Chapel
45%inclusion13 decks29 decks
5%synergy
Drowned Catacomb
45%inclusion13 decks29 decks
8%synergy
Watery Grave
45%inclusion13 decks29 decks
-6%synergy
Contaminated Landscape
41%inclusion12 decks29 decks
27%synergy
Prairie Stream
41%inclusion12 decks29 decks
1%synergy
Hallowed Fountain
41%inclusion12 decks29 decks
-8%synergy
Undercity Sewers
38%inclusion11 decks29 decks
24%synergy
Azorius Chancery
38%inclusion11 decks29 decks
24%synergy
Godless Shrine
38%inclusion11 decks29 decks
-13%synergy
Temple of Enlightenment
34%inclusion10 decks29 decks
18%synergy
Meticulous Archive
34%inclusion10 decks29 decks
21%synergy
Temple of Silence
34%inclusion10 decks29 decks
15%synergy
Polluted Delta
34%inclusion10 decks29 decks
-3%synergy
Raffine's Tower
31%inclusion9 decks29 decks
-10%synergy
Sunken Hollow
31%inclusion9 decks29 decks
-9%synergy
Flooded Strand
31%inclusion9 decks29 decks
-7%synergy
Shipwreck Marsh
28%inclusion8 decks29 decks
7%synergy
Evolving Wilds
28%inclusion8 decks29 decks
3%synergy
Orzhov Basilica
28%inclusion8 decks29 decks
12%synergy
Gloomlake Verge
28%inclusion8 decks29 decks
17%synergy
Marsh Flats
28%inclusion8 decks29 decks
-9%synergy
Obscura Storefront
28%inclusion8 decks29 decks
18%synergy
Deserted Beach
28%inclusion8 decks29 decks
7%synergy
Floodfarm Verge
28%inclusion8 decks29 decks
16%synergy
Shadowy Backstreet
24%inclusion7 decks29 decks
12%synergy
Temple of Deceit
24%inclusion7 decks29 decks
6%synergy
Dimir Aqueduct
24%inclusion7 decks29 decks
11%synergy
Ash Barrens
24%inclusion7 decks29 decks
13%synergy
Glasswing Grace
21%inclusion6 decks29 decks
18%synergy
Sea of Clouds
21%inclusion6 decks29 decks
-15%synergy
Fabled Passage
17%inclusion5 decks29 decks
10%synergy
Shattered Sanctum
17%inclusion5 decks29 decks
1%synergy
Vault of Champions
17%inclusion5 decks29 decks
-15%synergy
Tainted Isle
14%inclusion4 decks29 decks
7%synergy
Witch Enchanter
14%inclusion4 decks29 decks
7%synergy
Terramorphic Expanse
14%inclusion4 decks29 decks
-3%synergy
Fetid Pools
14%inclusion4 decks29 decks
7%synergy
Irrigated Farmland
14%inclusion4 decks29 decks
6%synergy
Skycloud Expanse
14%inclusion4 decks29 decks
-1%synergy
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