The Master of Keys (Commander) - Upgraded 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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Enchantments
Utility Lands
Mana Artifacts
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Mornsong Aria
18%inclusion2 decks11 decks
17%synergy
Twilight Diviner
10%inclusion1 decks10 decks
9%synergy
High Synergy Cards
Inquisitive Glimmer
83%inclusion35 decks42 decks
76%synergy
Gravebreaker Lamia
74%inclusion31 decks42 decks
73%synergy
Ripples of Undeath
74%inclusion31 decks42 decks
71%synergy
Entity Tracker
74%inclusion31 decks42 decks
68%synergy
Mesa Enchantress
69%inclusion29 decks42 decks
60%synergy
Animate Dead
69%inclusion29 decks42 decks
59%synergy
Starfield Mystic
64%inclusion27 decks42 decks
58%synergy
Demon of Fate's Design
62%inclusion26 decks42 decks
56%synergy
Fear of Sleep Paralysis
60%inclusion25 decks42 decks
54%synergy
Scrabbling Skullcrab
55%inclusion23 decks42 decks
54%synergy
Top Cards
Doomwake Giant
60%inclusion25 decks42 decks
54%synergy
Swords to Plowshares
57%inclusion24 decks42 decks
-11%synergy
Necromancy
55%inclusion23 decks42 decks
50%synergy
Mirrormade
55%inclusion23 decks42 decks
45%synergy
Dress Down
55%inclusion23 decks42 decks
52%synergy
Sphere of Safety
52%inclusion22 decks42 decks
43%synergy
Ondu Spiritdancer
52%inclusion22 decks42 decks
46%synergy
Grasp of Fate
50%inclusion21 decks42 decks
44%synergy
Mystic Remora
50%inclusion21 decks42 decks
29%synergy
Cemetery Tampering
50%inclusion21 decks42 decks
49%synergy
Game Changers
Smothering Tithe
29%inclusion12 decks42 decks
-3%synergy
Rhystic Study
17%inclusion7 decks42 decks
-15%synergy
Enlightened Tutor
12%inclusion5 decks42 decks
-8%synergy
Consecrated Sphinx
10%inclusion4 decks42 decks
3%synergy
Farewell
10%inclusion4 decks42 decks
-3%synergy
Serra's Sanctum
7.1%inclusion3 decks42 decks
5%synergy
Gifts Ungiven
7.1%inclusion3 decks42 decks
5%synergy
Demonic Tutor
7.1%inclusion3 decks42 decks
-14%synergy
Necropotence
7.1%inclusion3 decks42 decks
1%synergy
Creatures
Overlord of the Floodpits
45%inclusion19 decks42 decks
42%synergy
Overlord of the Balemurk
45%inclusion19 decks42 decks
43%synergy
Victor, Valgavoth's Seneschal
45%inclusion19 decks42 decks
43%synergy
Zur, Eternal Schemer
45%inclusion19 decks42 decks
42%synergy
Ghostly Dancers
38%inclusion16 decks42 decks
36%synergy
Heliod, the Radiant Dawn
36%inclusion15 decks42 decks
32%synergy
Fear of Impostors
33%inclusion14 decks42 decks
32%synergy
Silent Hallcreeper
33%inclusion14 decks42 decks
29%synergy
Grim Guardian
29%inclusion12 decks42 decks
26%synergy
Sage of Mysteries
26%inclusion11 decks42 decks
26%synergy
Enduring Curiosity
26%inclusion11 decks42 decks
18%synergy
Mindwrack Harpy
26%inclusion11 decks42 decks
26%synergy
Archon of Sun's Grace
21%inclusion9 decks42 decks
17%synergy
Athreos, Shroud-Veiled
21%inclusion9 decks42 decks
17%synergy
Balemurk Leech
21%inclusion9 decks42 decks
21%synergy
Abdel Adrian, Gorion's Ward
21%inclusion9 decks42 decks
20%synergy
Zur the Enchanter
21%inclusion9 decks42 decks
16%synergy
Lotho, Corrupt Shirriff
19%inclusion8 decks42 decks
2%synergy
Soaring Lightbringer
19%inclusion8 decks42 decks
14%synergy
Moon-Blessed Cleric
19%inclusion8 decks42 decks
14%synergy
Archetype of Imagination
17%inclusion7 decks42 decks
12%synergy
Hullbreaker Horror
17%inclusion7 decks42 decks
11%synergy
Alseid of Life's Bounty
17%inclusion7 decks42 decks
15%synergy
Starnheim Courser
14%inclusion6 decks42 decks
10%synergy
Overlord of the Mistmoors
14%inclusion6 decks42 decks
12%synergy
Skullsnap Nuisance
14%inclusion6 decks42 decks
14%synergy
Athreos, God of Passage
14%inclusion6 decks42 decks
13%synergy
Ancient Cellarspawn
14%inclusion6 decks42 decks
11%synergy
Aminatou, Veil Piercer
14%inclusion6 decks42 decks
13%synergy
Spirited Companion
12%inclusion5 decks42 decks
10%synergy
Grand Abolisher
12%inclusion5 decks42 decks
-3%synergy
Ledger Shredder
12%inclusion5 decks42 decks
3%synergy
Emet-Selch of the Third Seat
11%inclusion3 decks28 decks
1%synergy
Fear of Infinity
10%inclusion4 decks42 decks
9%synergy
Witch Enchanter
10%inclusion4 decks42 decks
3%synergy
Valley Floodcaller
10%inclusion4 decks42 decks
6%synergy
Hedron Crab
10%inclusion4 decks42 decks
9%synergy
Laboratory Maniac
10%inclusion4 decks42 decks
6%synergy
Neerdiv, Devious Diver
10%inclusion4 decks42 decks
9%synergy
Stenn, Paranoid Partisan
7.1%inclusion3 decks42 decks
6%synergy
Syr Konrad, the Grim
7.1%inclusion3 decks42 decks
1%synergy
The Mindskinner
7.1%inclusion3 decks42 decks
6%synergy
Lurrus of the Dream-Den
7.1%inclusion3 decks42 decks
6%synergy
Doom Whisperer
7.1%inclusion3 decks42 decks
6%synergy
Vilis, Broker of Blood
7.1%inclusion3 decks42 decks
6%synergy
Angel of Suffering
7.1%inclusion3 decks42 decks
7%synergy
Nashi, Searcher in the Dark
7.1%inclusion3 decks42 decks
7%synergy
Nightmare Shepherd
7.1%inclusion3 decks42 decks
5%synergy
Auramancer
7.1%inclusion3 decks42 decks
4%synergy
Summon: Bahamut
7.1%inclusion2 decks28 decks
6%synergy
Instants
An Offer You Can't Refuse
48%inclusion20 decks42 decks
20%synergy
Counterspell
48%inclusion20 decks42 decks
6%synergy
Arcane Denial
45%inclusion19 decks42 decks
25%synergy
Path to Exile
38%inclusion16 decks42 decks
-4%synergy
Dark Ritual
36%inclusion15 decks42 decks
16%synergy
Entomb
29%inclusion12 decks42 decks
22%synergy
Void Rend
26%inclusion11 decks42 decks
-8%synergy
Negate
24%inclusion10 decks42 decks
7%synergy
Frantic Search
17%inclusion7 decks42 decks
-1%synergy
Dovin's Veto
17%inclusion7 decks42 decks
-9%synergy
Swan Song
17%inclusion7 decks42 decks
-3%synergy
Anguished Unmaking
17%inclusion7 decks42 decks
-9%synergy
Thirst for Meaning
14%inclusion6 decks42 decks
13%synergy
Strix Serenade
14%inclusion6 decks42 decks
11%synergy
Generous Gift
14%inclusion6 decks42 decks
0%synergy
Fell the Profane
12%inclusion5 decks42 decks
3%synergy
Brainstorm
12%inclusion5 decks42 decks
-5%synergy
Otherworldly Gaze
12%inclusion5 decks42 decks
10%synergy
Cabal Ritual
10%inclusion4 decks42 decks
6%synergy
Utter End
10%inclusion4 decks42 decks
3%synergy
Inkshield
10%inclusion4 decks42 decks
0%synergy
Sink into Stupor
7.1%inclusion3 decks42 decks
-6%synergy
Withering Torment
7.1%inclusion3 decks42 decks
5%synergy
Sorceries
Sevinne's Reclamation
45%inclusion19 decks42 decks
36%synergy
Redress Fate
40%inclusion17 decks42 decks
35%synergy
Windfall
31%inclusion13 decks42 decks
18%synergy
Reanimate
31%inclusion13 decks42 decks
15%synergy
Dance of the Manse
31%inclusion13 decks42 decks
28%synergy
Glimpse the Unthinkable
24%inclusion10 decks42 decks
23%synergy
Singularity Rupture
23%inclusion6 decks26 decks
21%synergy
Space-Time Anomaly
23%inclusion6 decks26 decks
21%synergy
Extinguish All Hope
21%inclusion9 decks42 decks
20%synergy
Wrath of God
17%inclusion7 decks42 decks
13%synergy
Unmarked Grave
12%inclusion5 decks42 decks
11%synergy
Toxic Deluge
12%inclusion5 decks42 decks
-8%synergy
Traumatize
12%inclusion5 decks42 decks
11%synergy
Supreme Verdict
10%inclusion4 decks42 decks
-5%synergy
Resurgent Belief
10%inclusion4 decks42 decks
7%synergy
Open the Vaults
10%inclusion4 decks42 decks
8%synergy
Damn
10%inclusion4 decks42 decks
-11%synergy
Ponder
7.1%inclusion3 decks42 decks
-2%synergy
Austere Command
7.1%inclusion3 decks42 decks
-2%synergy
Lively Dirge
7.1%inclusion3 decks42 decks
6%synergy
Time Wipe
7.1%inclusion3 decks42 decks
0%synergy
Terminus
7.1%inclusion3 decks42 decks
3%synergy
Cut Your Losses
7.1%inclusion3 decks42 decks
7%synergy
Idyllic Tutor
7.1%inclusion3 decks42 decks
3%synergy
Demonic Counsel
7.1%inclusion3 decks42 decks
6%synergy
Night's Whisper
7.1%inclusion3 decks42 decks
5%synergy
Buried Alive
7.1%inclusion3 decks42 decks
3%synergy
Rise of the Dark Realms
7.1%inclusion3 decks42 decks
4%synergy
Utility Artifacts
Mesmeric Orb
31%inclusion13 decks42 decks
30%synergy
Cloud Key
21%inclusion9 decks42 decks
18%synergy
Lightning Greaves
17%inclusion7 decks42 decks
-6%synergy
Swiftfoot Boots
14%inclusion6 decks42 decks
-10%synergy
Pearl Medallion
7.1%inclusion3 decks42 decks
6%synergy
Whip of Erebos
7.1%inclusion3 decks42 decks
5%synergy
Enchantments
Secret Arcade // Dusty Parlor
50%inclusion21 decks42 decks
45%synergy
Estrid's Invocation
48%inclusion20 decks42 decks
43%synergy
Propaganda
45%inclusion19 decks42 decks
18%synergy
Amphibian Downpour
43%inclusion18 decks42 decks
38%synergy
Seal of Cleansing
43%inclusion18 decks42 decks
41%synergy
Sigil of the Empty Throne
38%inclusion16 decks42 decks
32%synergy
Blind Obedience
38%inclusion16 decks42 decks
26%synergy
Ghostly Prison
38%inclusion16 decks42 decks
16%synergy
Cacophony Unleashed
33%inclusion14 decks42 decks
32%synergy
Out of the Tombs
33%inclusion14 decks42 decks
33%synergy
Stillness in Motion
33%inclusion12 decks36 decks
33%synergy
Touch the Spirit Realm
29%inclusion12 decks42 decks
26%synergy
Timely Ward
29%inclusion12 decks42 decks
24%synergy
Starfield of Nyx
29%inclusion12 decks42 decks
25%synergy
Secrets of the Dead
29%inclusion12 decks42 decks
28%synergy
The Meathook Massacre
26%inclusion11 decks42 decks
23%synergy
Copy Enchantment
26%inclusion11 decks42 decks
21%synergy
Polluted Cistern // Dim Oubliette
26%inclusion11 decks42 decks
26%synergy
Greater Auramancy
26%inclusion11 decks42 decks
22%synergy
Defiled Crypt // Cadaver Lab
26%inclusion11 decks42 decks
25%synergy
Darksteel Mutation
24%inclusion10 decks42 decks
18%synergy
Dance of the Dead
24%inclusion10 decks42 decks
22%synergy
Court of Cunning
24%inclusion10 decks42 decks
23%synergy
The Tale of Tamiyo
24%inclusion10 decks42 decks
23%synergy
Monologue Tax
24%inclusion10 decks42 decks
18%synergy
Teval's Judgment
22%inclusion8 decks37 decks
21%synergy
Extravagant Replication
21%inclusion9 decks42 decks
16%synergy
Ethereal Armor
21%inclusion9 decks42 decks
17%synergy
Hallowed Haunting
21%inclusion9 decks42 decks
19%synergy
Phyrexian Arena
21%inclusion9 decks42 decks
7%synergy
Seal of Removal
21%inclusion9 decks42 decks
21%synergy
Authority of the Consuls
19%inclusion8 decks42 decks
7%synergy
Leyline of Anticipation
19%inclusion8 decks42 decks
15%synergy
All That Glitters
19%inclusion8 decks42 decks
10%synergy
Shark Typhoon
17%inclusion7 decks42 decks
11%synergy
One with the Multiverse
14%inclusion6 decks42 decks
10%synergy
Restricted Office // Lecture Hall
14%inclusion6 decks42 decks
12%synergy
Static Prison
14%inclusion6 decks42 decks
14%synergy
Nowhere to Run
14%inclusion6 decks42 decks
13%synergy
Aura of Silence
14%inclusion6 decks42 decks
11%synergy
Virtue of Persistence
14%inclusion6 decks42 decks
13%synergy
Omniscience
12%inclusion5 decks42 decks
8%synergy
Bottomless Pool // Locker Room
12%inclusion5 decks42 decks
10%synergy
Oubliette
12%inclusion5 decks42 decks
10%synergy
Solitary Confinement
12%inclusion5 decks42 decks
10%synergy
Imprisoned in the Moon
10%inclusion4 decks42 decks
3%synergy
Unable to Scream
10%inclusion4 decks42 decks
8%synergy
The Eldest Reborn
10%inclusion4 decks42 decks
7%synergy
Sanguine Bond
10%inclusion4 decks42 decks
2%synergy
Exquisite Blood
10%inclusion4 decks42 decks
3%synergy
Utility Lands
Hall of Heliod's Generosity
64%inclusion27 decks42 decks
51%synergy
Bojuka Bog
43%inclusion18 decks42 decks
16%synergy
Cephalid Coliseum
21%inclusion9 decks42 decks
18%synergy
Reliquary Tower
17%inclusion7 decks42 decks
-17%synergy
Halimar Depths
14%inclusion6 decks42 decks
10%synergy
Nephalia Drownyard
12%inclusion5 decks42 decks
11%synergy
Otawara, Soaring City
12%inclusion5 decks42 decks
-7%synergy
Takenuma, Abandoned Mire
10%inclusion4 decks42 decks
3%synergy
Mystic Sanctuary
7.1%inclusion3 decks42 decks
3%synergy
Geier Reach Sanitarium
7.1%inclusion3 decks42 decks
3%synergy
Urborg, Tomb of Yawgmoth
7.1%inclusion3 decks42 decks
-6%synergy
Vault of the Archangel
7.1%inclusion3 decks42 decks
1%synergy
Ishgard, the Holy See
7.1%inclusion2 decks28 decks
4%synergy
Mana Artifacts
Arcane Signet
86%inclusion36 decks42 decks
-2%synergy
Sol Ring
86%inclusion36 decks42 decks
-4%synergy
Talisman of Dominance
57%inclusion24 decks42 decks
7%synergy
Talisman of Progress
55%inclusion23 decks42 decks
11%synergy
Talisman of Hierarchy
55%inclusion23 decks42 decks
11%synergy
Azorius Signet
33%inclusion14 decks42 decks
2%synergy
Fellwar Stone
31%inclusion13 decks42 decks
-2%synergy
Orzhov Signet
29%inclusion12 decks42 decks
-4%synergy
Dimir Signet
24%inclusion10 decks42 decks
-7%synergy
Commander's Sphere
14%inclusion6 decks42 decks
-4%synergy
Mind Stone
12%inclusion5 decks42 decks
0%synergy
Chromatic Lantern
7.1%inclusion3 decks42 decks
-6%synergy
Lands
Command Tower
100%inclusion42 decks42 decks
7%synergy
Swamp
98%inclusion41 decks42 decks
6%synergy
Island
98%inclusion41 decks42 decks
5%synergy
Plains
98%inclusion41 decks42 decks
6%synergy
Exotic Orchard
69%inclusion29 decks42 decks
10%synergy
Arcane Sanctum
69%inclusion29 decks42 decks
15%synergy
Adarkar Wastes
64%inclusion27 decks42 decks
33%synergy
Caves of Koilos
60%inclusion25 decks42 decks
24%synergy
Underground River
57%inclusion24 decks42 decks
23%synergy
Isolated Chapel
55%inclusion23 decks42 decks
14%synergy
Glacial Fortress
48%inclusion20 decks42 decks
6%synergy
Prairie Stream
43%inclusion18 decks42 decks
2%synergy
Godless Shrine
43%inclusion18 decks42 decks
-8%synergy
Watery Grave
43%inclusion18 decks42 decks
-8%synergy
Drowned Catacomb
40%inclusion17 decks42 decks
4%synergy
Sunken Hollow
40%inclusion17 decks42 decks
1%synergy
Polluted Delta
40%inclusion17 decks42 decks
3%synergy
Evolving Wilds
38%inclusion16 decks42 decks
13%synergy
Temple of Silence
38%inclusion16 decks42 decks
19%synergy
Flooded Strand
38%inclusion16 decks42 decks
0%synergy
Hallowed Fountain
38%inclusion16 decks42 decks
-12%synergy
Terramorphic Expanse
36%inclusion15 decks42 decks
20%synergy
Temple of Deceit
36%inclusion15 decks42 decks
18%synergy
Valgavoth's Lair
36%inclusion15 decks42 decks
33%synergy
Raffine's Tower
36%inclusion15 decks42 decks
-5%synergy
Temple of Enlightenment
36%inclusion15 decks42 decks
20%synergy
Marsh Flats
33%inclusion14 decks42 decks
-3%synergy
Shadowy Backstreet
31%inclusion13 decks42 decks
18%synergy
Vault of Champions
31%inclusion13 decks42 decks
-2%synergy
Meticulous Archive
29%inclusion12 decks42 decks
15%synergy
Undercity Sewers
26%inclusion11 decks42 decks
12%synergy
Azorius Chancery
26%inclusion11 decks42 decks
12%synergy
Dimir Aqueduct
26%inclusion11 decks42 decks
13%synergy
Sea of Clouds
26%inclusion11 decks42 decks
-9%synergy
Gloomlake Verge
26%inclusion11 decks42 decks
15%synergy
Obscura Storefront
26%inclusion11 decks42 decks
16%synergy
Floodfarm Verge
26%inclusion11 decks42 decks
15%synergy
Morphic Pool
24%inclusion10 decks42 decks
-10%synergy
Deserted Beach
24%inclusion10 decks42 decks
3%synergy
Ash Barrens
21%inclusion9 decks42 decks
11%synergy
Shipwreck Marsh
21%inclusion9 decks42 decks
1%synergy
Contaminated Landscape
19%inclusion8 decks42 decks
5%synergy
Orzhov Basilica
19%inclusion8 decks42 decks
4%synergy
Tainted Isle
17%inclusion7 decks42 decks
10%synergy
Tainted Field
17%inclusion7 decks42 decks
10%synergy
Myriad Landscape
14%inclusion6 decks42 decks
6%synergy
Fetid Heath
14%inclusion6 decks42 decks
2%synergy
Skycloud Expanse
14%inclusion6 decks42 decks
-1%synergy
Path of Ancestry
14%inclusion6 decks42 decks
-13%synergy
Fell the Profane
12%inclusion5 decks42 decks
3%synergy
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