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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Sorceries
Utility Artifacts
Enchantments
Utility Lands
Mana Artifacts
Lands
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Mornsong Aria
22%inclusion2 decks9 decks
21%synergy
Twilight Diviner
13%inclusion1 decks8 decks
11%synergy
High Synergy Cards
Inquisitive Glimmer
85%inclusion35 decks41 decks
78%synergy
Gravebreaker Lamia
73%inclusion30 decks41 decks
72%synergy
Ripples of Undeath
73%inclusion30 decks41 decks
70%synergy
Entity Tracker
73%inclusion30 decks41 decks
67%synergy
Animate Dead
71%inclusion29 decks41 decks
61%synergy
Mesa Enchantress
68%inclusion28 decks41 decks
59%synergy
Demon of Fate's Design
63%inclusion26 decks41 decks
58%synergy
Starfield Mystic
63%inclusion26 decks41 decks
57%synergy
Fear of Sleep Paralysis
61%inclusion25 decks41 decks
56%synergy
Scrabbling Skullcrab
56%inclusion23 decks41 decks
55%synergy
Top Cards
Doomwake Giant
59%inclusion24 decks41 decks
53%synergy
Mirrormade
59%inclusion24 decks41 decks
49%synergy
Necromancy
56%inclusion23 decks41 decks
51%synergy
Swords to Plowshares
56%inclusion23 decks41 decks
-12%synergy
Dress Down
56%inclusion23 decks41 decks
54%synergy
Ondu Spiritdancer
51%inclusion21 decks41 decks
45%synergy
Sphere of Safety
51%inclusion21 decks41 decks
42%synergy
Secret Arcade // Dusty Parlor
51%inclusion21 decks41 decks
46%synergy
Grasp of Fate
49%inclusion20 decks41 decks
43%synergy
Mystic Remora
49%inclusion20 decks41 decks
28%synergy
Game Changers
Smothering Tithe
29%inclusion12 decks41 decks
-2%synergy
Rhystic Study
17%inclusion7 decks41 decks
-15%synergy
Enlightened Tutor
12%inclusion5 decks41 decks
-7%synergy
Consecrated Sphinx
10%inclusion4 decks41 decks
4%synergy
Farewell
10%inclusion4 decks41 decks
-3%synergy
Gifts Ungiven
7.3%inclusion3 decks41 decks
5%synergy
Serra's Sanctum
7.3%inclusion3 decks41 decks
6%synergy
Demonic Tutor
7.3%inclusion3 decks41 decks
-14%synergy
Necropotence
7.3%inclusion3 decks41 decks
1%synergy
Creatures
Overlord of the Floodpits
46%inclusion19 decks41 decks
43%synergy
Victor, Valgavoth's Seneschal
46%inclusion19 decks41 decks
44%synergy
Overlord of the Balemurk
46%inclusion19 decks41 decks
44%synergy
Zur, Eternal Schemer
44%inclusion18 decks41 decks
41%synergy
Ghostly Dancers
39%inclusion16 decks41 decks
36%synergy
Heliod, the Radiant Dawn
37%inclusion15 decks41 decks
33%synergy
Fear of Impostors
34%inclusion14 decks41 decks
33%synergy
Silent Hallcreeper
34%inclusion14 decks41 decks
30%synergy
Grim Guardian
29%inclusion12 decks41 decks
27%synergy
Enduring Curiosity
27%inclusion11 decks41 decks
19%synergy
Sage of Mysteries
24%inclusion10 decks41 decks
24%synergy
Mindwrack Harpy
24%inclusion10 decks41 decks
24%synergy
Abdel Adrian, Gorion's Ward
22%inclusion9 decks41 decks
20%synergy
Athreos, Shroud-Veiled
22%inclusion9 decks41 decks
18%synergy
Balemurk Leech
22%inclusion9 decks41 decks
21%synergy
Lotho, Corrupt Shirriff
20%inclusion8 decks41 decks
3%synergy
Soaring Lightbringer
20%inclusion8 decks41 decks
15%synergy
Archon of Sun's Grace
20%inclusion8 decks41 decks
15%synergy
Zur the Enchanter
20%inclusion8 decks41 decks
14%synergy
Moon-Blessed Cleric
17%inclusion7 decks41 decks
12%synergy
Hullbreaker Horror
17%inclusion7 decks41 decks
11%synergy
Archetype of Imagination
17%inclusion7 decks41 decks
12%synergy
Starnheim Courser
15%inclusion6 decks41 decks
11%synergy
Skullsnap Nuisance
15%inclusion6 decks41 decks
14%synergy
Ancient Cellarspawn
15%inclusion6 decks41 decks
12%synergy
Overlord of the Mistmoors
15%inclusion6 decks41 decks
13%synergy
Athreos, God of Passage
15%inclusion6 decks41 decks
13%synergy
Aminatou, Veil Piercer
15%inclusion6 decks41 decks
13%synergy
Alseid of Life's Bounty
15%inclusion6 decks41 decks
13%synergy
Spirited Companion
12%inclusion5 decks41 decks
10%synergy
Grand Abolisher
12%inclusion5 decks41 decks
-2%synergy
Ledger Shredder
12%inclusion5 decks41 decks
3%synergy
Emet-Selch of the Third Seat
11%inclusion3 decks27 decks
2%synergy
Fear of Infinity
10%inclusion4 decks41 decks
9%synergy
Witch Enchanter
10%inclusion4 decks41 decks
3%synergy
Valley Floodcaller
10%inclusion4 decks41 decks
6%synergy
Hedron Crab
10%inclusion4 decks41 decks
9%synergy
Laboratory Maniac
10%inclusion4 decks41 decks
6%synergy
Neerdiv, Devious Diver
10%inclusion4 decks41 decks
10%synergy
Summon: Bahamut
7.4%inclusion2 decks27 decks
6%synergy
Stenn, Paranoid Partisan
7.3%inclusion3 decks41 decks
6%synergy
Syr Konrad, the Grim
7.3%inclusion3 decks41 decks
1%synergy
The Mindskinner
7.3%inclusion3 decks41 decks
6%synergy
Doom Whisperer
7.3%inclusion3 decks41 decks
6%synergy
Lurrus of the Dream-Den
7.3%inclusion3 decks41 decks
6%synergy
Angel of Suffering
7.3%inclusion3 decks41 decks
7%synergy
Vilis, Broker of Blood
7.3%inclusion3 decks41 decks
6%synergy
Nashi, Searcher in the Dark
7.3%inclusion3 decks41 decks
7%synergy
Nightmare Shepherd
7.3%inclusion3 decks41 decks
5%synergy
Auramancer
7.3%inclusion3 decks41 decks
4%synergy
Instants
An Offer You Can't Refuse
46%inclusion19 decks41 decks
19%synergy
Arcane Denial
46%inclusion19 decks41 decks
26%synergy
Counterspell
46%inclusion19 decks41 decks
5%synergy
Path to Exile
39%inclusion16 decks41 decks
-3%synergy
Dark Ritual
37%inclusion15 decks41 decks
17%synergy
Entomb
27%inclusion11 decks41 decks
20%synergy
Negate
24%inclusion10 decks41 decks
8%synergy
Void Rend
24%inclusion10 decks41 decks
-10%synergy
Frantic Search
17%inclusion7 decks41 decks
-1%synergy
Dovin's Veto
15%inclusion6 decks41 decks
-11%synergy
Thirst for Meaning
15%inclusion6 decks41 decks
13%synergy
Strix Serenade
15%inclusion6 decks41 decks
11%synergy
Swan Song
15%inclusion6 decks41 decks
-5%synergy
Anguished Unmaking
15%inclusion6 decks41 decks
-11%synergy
Generous Gift
15%inclusion6 decks41 decks
0%synergy
Fell the Profane
12%inclusion5 decks41 decks
3%synergy
Brainstorm
12%inclusion5 decks41 decks
-5%synergy
Cabal Ritual
10%inclusion4 decks41 decks
6%synergy
Utter End
10%inclusion4 decks41 decks
3%synergy
Otherworldly Gaze
10%inclusion4 decks41 decks
8%synergy
Inkshield
10%inclusion4 decks41 decks
0%synergy
Sink into Stupor
7.3%inclusion3 decks41 decks
-5%synergy
Withering Torment
7.3%inclusion3 decks41 decks
6%synergy
Sorceries
Sevinne's Reclamation
44%inclusion18 decks41 decks
35%synergy
Redress Fate
41%inclusion17 decks41 decks
36%synergy
Windfall
32%inclusion13 decks41 decks
18%synergy
Reanimate
32%inclusion13 decks41 decks
16%synergy
Dance of the Manse
32%inclusion13 decks41 decks
28%synergy
Glimpse the Unthinkable
24%inclusion10 decks41 decks
24%synergy
Singularity Rupture
20%inclusion5 decks25 decks
18%synergy
Space-Time Anomaly
20%inclusion5 decks25 decks
18%synergy
Extinguish All Hope
20%inclusion8 decks41 decks
18%synergy
Wrath of God
17%inclusion7 decks41 decks
13%synergy
Unmarked Grave
12%inclusion5 decks41 decks
11%synergy
Traumatize
12%inclusion5 decks41 decks
12%synergy
Toxic Deluge
12%inclusion5 decks41 decks
-7%synergy
Supreme Verdict
10%inclusion4 decks41 decks
-5%synergy
Open the Vaults
10%inclusion4 decks41 decks
8%synergy
Time Wipe
10%inclusion4 decks41 decks
3%synergy
Damn
10%inclusion4 decks41 decks
-11%synergy
Ponder
7.3%inclusion3 decks41 decks
-2%synergy
Lively Dirge
7.3%inclusion3 decks41 decks
6%synergy
Resurgent Belief
7.3%inclusion3 decks41 decks
5%synergy
Terminus
7.3%inclusion3 decks41 decks
3%synergy
Cut Your Losses
7.3%inclusion3 decks41 decks
7%synergy
Night's Whisper
7.3%inclusion3 decks41 decks
5%synergy
Idyllic Tutor
7.3%inclusion3 decks41 decks
3%synergy
Demonic Counsel
7.3%inclusion3 decks41 decks
6%synergy
Buried Alive
7.3%inclusion3 decks41 decks
3%synergy
Rise of the Dark Realms
7.3%inclusion3 decks41 decks
4%synergy
Utility Artifacts
Mesmeric Orb
29%inclusion12 decks41 decks
28%synergy
Cloud Key
22%inclusion9 decks41 decks
19%synergy
Lightning Greaves
17%inclusion7 decks41 decks
-5%synergy
Swiftfoot Boots
15%inclusion6 decks41 decks
-9%synergy
Pearl Medallion
7.3%inclusion3 decks41 decks
6%synergy
Whip of Erebos
7.3%inclusion3 decks41 decks
5%synergy
Enchantments
Cemetery Tampering
49%inclusion20 decks41 decks
48%synergy
Estrid's Invocation
44%inclusion18 decks41 decks
39%synergy
Amphibian Downpour
44%inclusion18 decks41 decks
39%synergy
Propaganda
44%inclusion18 decks41 decks
16%synergy
Seal of Cleansing
41%inclusion17 decks41 decks
40%synergy
Sigil of the Empty Throne
37%inclusion15 decks41 decks
31%synergy
Blind Obedience
37%inclusion15 decks41 decks
24%synergy
Ghostly Prison
37%inclusion15 decks41 decks
15%synergy
Stillness in Motion
34%inclusion12 decks35 decks
34%synergy
Cacophony Unleashed
34%inclusion14 decks41 decks
32%synergy
Out of the Tombs
34%inclusion14 decks41 decks
34%synergy
Timely Ward
29%inclusion12 decks41 decks
24%synergy
The Meathook Massacre
27%inclusion11 decks41 decks
23%synergy
Touch the Spirit Realm
27%inclusion11 decks41 decks
24%synergy
Defiled Crypt // Cadaver Lab
27%inclusion11 decks41 decks
26%synergy
Starfield of Nyx
27%inclusion11 decks41 decks
23%synergy
Secrets of the Dead
27%inclusion11 decks41 decks
27%synergy
Polluted Cistern // Dim Oubliette
27%inclusion11 decks41 decks
26%synergy
Dance of the Dead
24%inclusion10 decks41 decks
22%synergy
Court of Cunning
24%inclusion10 decks41 decks
23%synergy
Greater Auramancy
24%inclusion10 decks41 decks
20%synergy
Copy Enchantment
24%inclusion10 decks41 decks
20%synergy
The Tale of Tamiyo
24%inclusion10 decks41 decks
24%synergy
Monologue Tax
24%inclusion10 decks41 decks
18%synergy
Teval's Judgment
22%inclusion8 decks36 decks
21%synergy
Darksteel Mutation
22%inclusion9 decks41 decks
16%synergy
Extravagant Replication
22%inclusion9 decks41 decks
17%synergy
Ethereal Armor
22%inclusion9 decks41 decks
17%synergy
Phyrexian Arena
22%inclusion9 decks41 decks
8%synergy
All That Glitters
20%inclusion8 decks41 decks
11%synergy
Seal of Removal
20%inclusion8 decks41 decks
19%synergy
Leyline of Anticipation
20%inclusion8 decks41 decks
15%synergy
Hallowed Haunting
20%inclusion8 decks41 decks
17%synergy
Shark Typhoon
17%inclusion7 decks41 decks
11%synergy
Authority of the Consuls
17%inclusion7 decks41 decks
5%synergy
One with the Multiverse
15%inclusion6 decks41 decks
10%synergy
Restricted Office // Lecture Hall
15%inclusion6 decks41 decks
13%synergy
Virtue of Persistence
15%inclusion6 decks41 decks
13%synergy
Static Prison
15%inclusion6 decks41 decks
14%synergy
Aura of Silence
12%inclusion5 decks41 decks
9%synergy
Omniscience
12%inclusion5 decks41 decks
8%synergy
Bottomless Pool // Locker Room
12%inclusion5 decks41 decks
10%synergy
Solitary Confinement
12%inclusion5 decks41 decks
10%synergy
Nowhere to Run
12%inclusion5 decks41 decks
11%synergy
Exquisite Blood
10%inclusion4 decks41 decks
3%synergy
The Eldest Reborn
10%inclusion4 decks41 decks
7%synergy
Sheltered by Ghosts
10%inclusion4 decks41 decks
7%synergy
Sanguine Bond
10%inclusion4 decks41 decks
2%synergy
Dazzling Theater // Prop Room
10%inclusion4 decks41 decks
8%synergy
Mirror Room // Fractured Realm
10%inclusion4 decks41 decks
7%synergy
Utility Lands
Hall of Heliod's Generosity
63%inclusion26 decks41 decks
50%synergy
Bojuka Bog
44%inclusion18 decks41 decks
17%synergy
Cephalid Coliseum
20%inclusion8 decks41 decks
16%synergy
Reliquary Tower
17%inclusion7 decks41 decks
-17%synergy
Halimar Depths
15%inclusion6 decks41 decks
10%synergy
Nephalia Drownyard
12%inclusion5 decks41 decks
12%synergy
Otawara, Soaring City
12%inclusion5 decks41 decks
-7%synergy
Takenuma, Abandoned Mire
10%inclusion4 decks41 decks
3%synergy
Ishgard, the Holy See
7.4%inclusion2 decks27 decks
4%synergy
Mystic Sanctuary
7.3%inclusion3 decks41 decks
3%synergy
Vault of the Archangel
7.3%inclusion3 decks41 decks
1%synergy
Geier Reach Sanitarium
7.3%inclusion3 decks41 decks
3%synergy
Urborg, Tomb of Yawgmoth
7.3%inclusion3 decks41 decks
-6%synergy
Mana Artifacts
Arcane Signet
85%inclusion35 decks41 decks
-2%synergy
Sol Ring
85%inclusion35 decks41 decks
-5%synergy
Talisman of Dominance
56%inclusion23 decks41 decks
7%synergy
Talisman of Progress
54%inclusion22 decks41 decks
10%synergy
Talisman of Hierarchy
54%inclusion22 decks41 decks
10%synergy
Azorius Signet
32%inclusion13 decks41 decks
0%synergy
Fellwar Stone
29%inclusion12 decks41 decks
-4%synergy
Orzhov Signet
27%inclusion11 decks41 decks
-7%synergy
Dimir Signet
22%inclusion9 decks41 decks
-10%synergy
Commander's Sphere
15%inclusion6 decks41 decks
-4%synergy
Mind Stone
12%inclusion5 decks41 decks
0%synergy
Chromatic Lantern
7.3%inclusion3 decks41 decks
-6%synergy
Lands
Command Tower
100%inclusion41 decks41 decks
7%synergy
Swamp
98%inclusion40 decks41 decks
6%synergy
Island
98%inclusion40 decks41 decks
5%synergy
Plains
98%inclusion40 decks41 decks
6%synergy
Exotic Orchard
68%inclusion28 decks41 decks
10%synergy
Arcane Sanctum
68%inclusion28 decks41 decks
14%synergy
Adarkar Wastes
63%inclusion26 decks41 decks
32%synergy
Caves of Koilos
59%inclusion24 decks41 decks
23%synergy
Underground River
59%inclusion24 decks41 decks
25%synergy
Isolated Chapel
56%inclusion23 decks41 decks
16%synergy
Glacial Fortress
49%inclusion20 decks41 decks
8%synergy
Godless Shrine
44%inclusion18 decks41 decks
-7%synergy
Watery Grave
44%inclusion18 decks41 decks
-6%synergy
Prairie Stream
41%inclusion17 decks41 decks
1%synergy
Polluted Delta
41%inclusion17 decks41 decks
4%synergy
Drowned Catacomb
41%inclusion17 decks41 decks
5%synergy
Hallowed Fountain
39%inclusion16 decks41 decks
-11%synergy
Flooded Strand
39%inclusion16 decks41 decks
1%synergy
Sunken Hollow
39%inclusion16 decks41 decks
-1%synergy
Temple of Silence
39%inclusion16 decks41 decks
20%synergy
Temple of Deceit
37%inclusion15 decks41 decks
19%synergy
Raffine's Tower
37%inclusion15 decks41 decks
-4%synergy
Evolving Wilds
37%inclusion15 decks41 decks
12%synergy
Valgavoth's Lair
37%inclusion15 decks41 decks
34%synergy
Temple of Enlightenment
37%inclusion15 decks41 decks
20%synergy
Terramorphic Expanse
34%inclusion14 decks41 decks
18%synergy
Marsh Flats
34%inclusion14 decks41 decks
-2%synergy
Shadowy Backstreet
32%inclusion13 decks41 decks
19%synergy
Vault of Champions
32%inclusion13 decks41 decks
-1%synergy
Meticulous Archive
29%inclusion12 decks41 decks
15%synergy
Undercity Sewers
27%inclusion11 decks41 decks
12%synergy
Azorius Chancery
27%inclusion11 decks41 decks
13%synergy
Dimir Aqueduct
27%inclusion11 decks41 decks
13%synergy
Sea of Clouds
27%inclusion11 decks41 decks
-9%synergy
Gloomlake Verge
27%inclusion11 decks41 decks
16%synergy
Obscura Storefront
27%inclusion11 decks41 decks
17%synergy
Floodfarm Verge
27%inclusion11 decks41 decks
16%synergy
Morphic Pool
24%inclusion10 decks41 decks
-10%synergy
Deserted Beach
24%inclusion10 decks41 decks
4%synergy
Shipwreck Marsh
22%inclusion9 decks41 decks
1%synergy
Contaminated Landscape
20%inclusion8 decks41 decks
5%synergy
Ash Barrens
20%inclusion8 decks41 decks
9%synergy
Orzhov Basilica
20%inclusion8 decks41 decks
4%synergy
Tainted Isle
15%inclusion6 decks41 decks
8%synergy
Myriad Landscape
15%inclusion6 decks41 decks
6%synergy
Fetid Heath
15%inclusion6 decks41 decks
2%synergy
Tainted Field
15%inclusion6 decks41 decks
8%synergy
Path of Ancestry
15%inclusion6 decks41 decks
-13%synergy
Fell the Profane
12%inclusion5 decks41 decks
3%synergy
Fabled Passage
12%inclusion5 decks41 decks
5%synergy
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