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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Inquisitive Glimmer
89%inclusion31 decks35 decks
81%synergy
Gravebreaker Lamia
80%inclusion28 decks35 decks
79%synergy
Entity Tracker
80%inclusion28 decks35 decks
73%synergy
Ripples of Undeath
71%inclusion25 decks35 decks
69%synergy
Demon of Fate's Design
69%inclusion24 decks35 decks
63%synergy
Fear of Sleep Paralysis
69%inclusion24 decks35 decks
63%synergy
Mesa Enchantress
71%inclusion25 decks35 decks
62%synergy
Starfield Mystic
69%inclusion24 decks35 decks
62%synergy
Hall of Heliod's Generosity
74%inclusion26 decks35 decks
61%synergy
Scrabbling Skullcrab
60%inclusion21 decks35 decks
59%synergy
Top Cards
Animate Dead
69%inclusion24 decks35 decks
59%synergy
Doomwake Giant
63%inclusion22 decks35 decks
57%synergy
Dress Down
60%inclusion21 decks35 decks
57%synergy
Mirrormade
57%inclusion20 decks35 decks
47%synergy
Secret Arcade // Dusty Parlor
57%inclusion20 decks35 decks
52%synergy
Victor, Valgavoth's Seneschal
54%inclusion19 decks35 decks
52%synergy
Cemetery Tampering
54%inclusion19 decks35 decks
54%synergy
Swords to Plowshares
54%inclusion19 decks35 decks
-14%synergy
Counterspell
54%inclusion19 decks35 decks
13%synergy
Ondu Spiritdancer
54%inclusion19 decks35 decks
48%synergy
Game Changers
Smothering Tithe
29%inclusion10 decks35 decks
-4%synergy
Rhystic Study
17%inclusion6 decks35 decks
-15%synergy
Consecrated Sphinx
11%inclusion4 decks35 decks
5%synergy
Enlightened Tutor
11%inclusion4 decks35 decks
-9%synergy
Necropotence
8.6%inclusion3 decks35 decks
2%synergy
Serra's Sanctum
5.7%inclusion2 decks35 decks
4%synergy
Thassa's Oracle
5.7%inclusion2 decks35 decks
-4%synergy
Gifts Ungiven
5.7%inclusion2 decks35 decks
3%synergy
Demonic Tutor
5.7%inclusion2 decks35 decks
-16%synergy
Creatures
Overlord of the Floodpits
51%inclusion18 decks35 decks
48%synergy
Overlord of the Balemurk
49%inclusion17 decks35 decks
47%synergy
Zur, Eternal Schemer
49%inclusion17 decks35 decks
45%synergy
Ghostly Dancers
43%inclusion15 decks35 decks
40%synergy
Silent Hallcreeper
40%inclusion14 decks35 decks
36%synergy
Heliod, the Radiant Dawn
37%inclusion13 decks35 decks
33%synergy
Fear of Impostors
34%inclusion12 decks35 decks
33%synergy
Enduring Curiosity
34%inclusion12 decks35 decks
27%synergy
Grim Guardian
29%inclusion10 decks35 decks
26%synergy
Archon of Sun's Grace
26%inclusion9 decks35 decks
21%synergy
Soaring Lightbringer
26%inclusion9 decks35 decks
21%synergy
Athreos, Shroud-Veiled
26%inclusion9 decks35 decks
21%synergy
Mindwrack Harpy
26%inclusion9 decks35 decks
25%synergy
Sage of Mysteries
23%inclusion8 decks35 decks
23%synergy
Abdel Adrian, Gorion's Ward
23%inclusion8 decks35 decks
21%synergy
Moon-Blessed Cleric
20%inclusion7 decks35 decks
15%synergy
Balemurk Leech
20%inclusion7 decks35 decks
19%synergy
Archetype of Imagination
20%inclusion7 decks35 decks
15%synergy
Starnheim Courser
17%inclusion6 decks35 decks
13%synergy
Lotho, Corrupt Shirriff
17%inclusion6 decks35 decks
0%synergy
Skullsnap Nuisance
17%inclusion6 decks35 decks
17%synergy
Alseid of Life's Bounty
17%inclusion6 decks35 decks
16%synergy
Hullbreaker Horror
17%inclusion6 decks35 decks
11%synergy
Aminatou, Veil Piercer
17%inclusion6 decks35 decks
16%synergy
Zur the Enchanter
17%inclusion6 decks35 decks
12%synergy
Spirited Companion
14%inclusion5 decks35 decks
12%synergy
Grand Abolisher
14%inclusion5 decks35 decks
0%synergy
Fear of Infinity
11%inclusion4 decks35 decks
11%synergy
Valley Floodcaller
11%inclusion4 decks35 decks
7%synergy
Overlord of the Mistmoors
11%inclusion4 decks35 decks
9%synergy
Athreos, God of Passage
11%inclusion4 decks35 decks
10%synergy
Ancient Cellarspawn
11%inclusion4 decks35 decks
8%synergy
Laboratory Maniac
11%inclusion4 decks35 decks
8%synergy
Neerdiv, Devious Diver
11%inclusion4 decks35 decks
11%synergy
Emet-Selch of the Third Seat
10%inclusion2 decks20 decks
0%synergy
Stenn, Paranoid Partisan
8.6%inclusion3 decks35 decks
7%synergy
Syr Konrad, the Grim
8.6%inclusion3 decks35 decks
2%synergy
The Mindskinner
8.6%inclusion3 decks35 decks
8%synergy
Lurrus of the Dream-Den
8.6%inclusion3 decks35 decks
7%synergy
Nightmare Shepherd
8.6%inclusion3 decks35 decks
6%synergy
Auramancer
8.6%inclusion3 decks35 decks
6%synergy
Vilis, Broker of Blood
8.6%inclusion3 decks35 decks
8%synergy
Nashi, Searcher in the Dark
8.6%inclusion3 decks35 decks
8%synergy
Ledger Shredder
8.6%inclusion3 decks35 decks
0%synergy
Summon: Shiva
6.1%inclusion2 decks33 decks
6%synergy
Solemn Simulacrum
5.7%inclusion2 decks35 decks
-10%synergy
Witch Enchanter
5.7%inclusion2 decks35 decks
-1%synergy
Phenax, God of Deception
5.7%inclusion2 decks35 decks
5%synergy
Fear of Failed Tests
5.7%inclusion2 decks35 decks
5%synergy
Doom Whisperer
5.7%inclusion2 decks35 decks
4%synergy
Instants
Arcane Denial
51%inclusion18 decks35 decks
31%synergy
An Offer You Can't Refuse
46%inclusion16 decks35 decks
19%synergy
Path to Exile
40%inclusion14 decks35 decks
-2%synergy
Dark Ritual
34%inclusion12 decks35 decks
15%synergy
Negate
26%inclusion9 decks35 decks
9%synergy
Void Rend
26%inclusion9 decks35 decks
-8%synergy
Entomb
23%inclusion8 decks35 decks
16%synergy
Thirst for Meaning
20%inclusion7 decks35 decks
18%synergy
Frantic Search
14%inclusion5 decks35 decks
-3%synergy
Brainstorm
14%inclusion5 decks35 decks
-3%synergy
Swan Song
14%inclusion5 decks35 decks
-5%synergy
Strix Serenade
14%inclusion5 decks35 decks
11%synergy
Anguished Unmaking
14%inclusion5 decks35 decks
-10%synergy
Generous Gift
14%inclusion5 decks35 decks
-1%synergy
Fell the Profane
11%inclusion4 decks35 decks
3%synergy
Otherworldly Gaze
11%inclusion4 decks35 decks
9%synergy
Utter End
11%inclusion4 decks35 decks
4%synergy
Inkshield
11%inclusion4 decks35 decks
2%synergy
Dovin's Veto
8.6%inclusion3 decks35 decks
-16%synergy
Withering Torment
8.6%inclusion3 decks35 decks
7%synergy
Flare of Fortitude
5.7%inclusion2 decks35 decks
3%synergy
Return to Dust
5.7%inclusion2 decks35 decks
2%synergy
Dawn's Truce
5.7%inclusion2 decks35 decks
1%synergy
Disallow
5.7%inclusion2 decks35 decks
2%synergy
Flawless Maneuver
5.7%inclusion2 decks35 decks
-2%synergy
Cabal Ritual
5.7%inclusion2 decks35 decks
2%synergy
Faithful Mending
5.7%inclusion2 decks35 decks
2%synergy
Angel's Grace
5.7%inclusion2 decks35 decks
3%synergy
Sorceries
Sevinne's Reclamation
46%inclusion16 decks35 decks
37%synergy
Redress Fate
43%inclusion15 decks35 decks
37%synergy
Dance of the Manse
37%inclusion13 decks35 decks
33%synergy
Reanimate
34%inclusion12 decks35 decks
18%synergy
Windfall
29%inclusion10 decks35 decks
15%synergy
Singularity Rupture
28%inclusion5 decks18 decks
25%synergy
Glimpse the Unthinkable
23%inclusion8 decks35 decks
22%synergy
Space-Time Anomaly
22%inclusion4 decks18 decks
20%synergy
Extinguish All Hope
20%inclusion7 decks35 decks
18%synergy
Wrath of God
17%inclusion6 decks35 decks
13%synergy
Traumatize
14%inclusion5 decks35 decks
14%synergy
Open the Vaults
11%inclusion4 decks35 decks
10%synergy
Unmarked Grave
11%inclusion4 decks35 decks
10%synergy
Farewell
11%inclusion4 decks35 decks
-2%synergy
Time Wipe
11%inclusion4 decks35 decks
4%synergy
Demonic Counsel
11%inclusion4 decks35 decks
10%synergy
Damn
11%inclusion4 decks35 decks
-9%synergy
Ponder
8.6%inclusion3 decks35 decks
-1%synergy
Supreme Verdict
8.6%inclusion3 decks35 decks
-6%synergy
Terminus
8.6%inclusion3 decks35 decks
4%synergy
Cut Your Losses
8.6%inclusion3 decks35 decks
8%synergy
Night's Whisper
8.6%inclusion3 decks35 decks
6%synergy
Idyllic Tutor
8.6%inclusion3 decks35 decks
4%synergy
Toxic Deluge
8.6%inclusion3 decks35 decks
-11%synergy
Rise of the Dark Realms
8.6%inclusion3 decks35 decks
6%synergy
Commune with Evil
5.7%inclusion2 decks35 decks
6%synergy
Austere Command
5.7%inclusion2 decks35 decks
-3%synergy
Lively Dirge
5.7%inclusion2 decks35 decks
4%synergy
Triumphant Reckoning
5.7%inclusion2 decks35 decks
6%synergy
Resurgent Belief
5.7%inclusion2 decks35 decks
4%synergy
Replenish
5.7%inclusion2 decks35 decks
4%synergy
Diabolic Vision
5.7%inclusion2 decks35 decks
3%synergy
Approach of the Second Sun
5.7%inclusion2 decks35 decks
2%synergy
Buried Alive
5.7%inclusion2 decks35 decks
2%synergy
Breach the Multiverse
5.7%inclusion2 decks35 decks
4%synergy
Utility Artifacts
Mesmeric Orb
29%inclusion10 decks35 decks
27%synergy
Cloud Key
23%inclusion8 decks35 decks
20%synergy
Lightning Greaves
20%inclusion7 decks35 decks
-2%synergy
Swiftfoot Boots
14%inclusion5 decks35 decks
-10%synergy
Whip of Erebos
8.6%inclusion3 decks35 decks
6%synergy
Crucible of Worlds
5.7%inclusion2 decks35 decks
5%synergy
Pearl Medallion
5.7%inclusion2 decks35 decks
5%synergy
Wayfarer's Bauble
5.7%inclusion2 decks35 decks
-3%synergy
Mask of the Schemer
5.7%inclusion2 decks35 decks
5%synergy
Mindcrank
5.7%inclusion2 decks35 decks
4%synergy
The Wind Crystal
5.0%inclusion1 decks20 decks
0%synergy
The Water Crystal
5.0%inclusion1 decks20 decks
3%synergy
Enchantments
Necromancy
51%inclusion18 decks35 decks
47%synergy
Sphere of Safety
51%inclusion18 decks35 decks
42%synergy
Grasp of Fate
49%inclusion17 decks35 decks
42%synergy
Propaganda
49%inclusion17 decks35 decks
22%synergy
Sigil of the Empty Throne
46%inclusion16 decks35 decks
40%synergy
Estrid's Invocation
46%inclusion16 decks35 decks
41%synergy
Blind Obedience
43%inclusion15 decks35 decks
30%synergy
Mystic Remora
43%inclusion15 decks35 decks
21%synergy
Ghostly Prison
43%inclusion15 decks35 decks
21%synergy
Amphibian Downpour
40%inclusion14 decks35 decks
35%synergy
Seal of Cleansing
40%inclusion14 decks35 decks
38%synergy
Stillness in Motion
34%inclusion10 decks29 decks
34%synergy
Cacophony Unleashed
34%inclusion12 decks35 decks
33%synergy
Out of the Tombs
31%inclusion11 decks35 decks
31%synergy
Defiled Crypt // Cadaver Lab
31%inclusion11 decks35 decks
31%synergy
Starfield of Nyx
31%inclusion11 decks35 decks
27%synergy
The Meathook Massacre
29%inclusion10 decks35 decks
25%synergy
The Tale of Tamiyo
29%inclusion10 decks35 decks
28%synergy
Touch the Spirit Realm
29%inclusion10 decks35 decks
26%synergy
Secrets of the Dead
29%inclusion10 decks35 decks
28%synergy
Polluted Cistern // Dim Oubliette
29%inclusion10 decks35 decks
28%synergy
Timely Ward
29%inclusion10 decks35 decks
24%synergy
Extravagant Replication
26%inclusion9 decks35 decks
21%synergy
Copy Enchantment
26%inclusion9 decks35 decks
21%synergy
Monologue Tax
26%inclusion9 decks35 decks
20%synergy
Phyrexian Arena
26%inclusion9 decks35 decks
12%synergy
Court of Cunning
23%inclusion8 decks35 decks
22%synergy
Greater Auramancy
23%inclusion8 decks35 decks
18%synergy
Dance of the Dead
20%inclusion7 decks35 decks
18%synergy
Shark Typhoon
20%inclusion7 decks35 decks
14%synergy
All That Glitters
20%inclusion7 decks35 decks
11%synergy
Authority of the Consuls
20%inclusion7 decks35 decks
9%synergy
Leyline of Anticipation
20%inclusion7 decks35 decks
15%synergy
One with the Multiverse
17%inclusion6 decks35 decks
12%synergy
Restricted Office // Lecture Hall
17%inclusion6 decks35 decks
15%synergy
Seal of Removal
17%inclusion6 decks35 decks
17%synergy
Ethereal Armor
17%inclusion6 decks35 decks
12%synergy
Hallowed Haunting
17%inclusion6 decks35 decks
15%synergy
Teval's Judgment
17%inclusion5 decks30 decks
16%synergy
Darksteel Mutation
14%inclusion5 decks35 decks
8%synergy
Static Prison
14%inclusion5 decks35 decks
14%synergy
Aura of Silence
14%inclusion5 decks35 decks
11%synergy
Virtue of Persistence
14%inclusion5 decks35 decks
12%synergy
Bottomless Pool // Locker Room
14%inclusion5 decks35 decks
12%synergy
Sanguine Bond
11%inclusion4 decks35 decks
4%synergy
Omniscience
11%inclusion4 decks35 decks
8%synergy
The Eldest Reborn
11%inclusion4 decks35 decks
9%synergy
Exquisite Blood
11%inclusion4 decks35 decks
5%synergy
Sheltered by Ghosts
11%inclusion4 decks35 decks
9%synergy
Dazzling Theater // Prop Room
11%inclusion4 decks35 decks
10%synergy
Battles
Invasion of Theros
5.7%inclusion2 decks35 decks
4%synergy
Planeswalkers
Jace, Wielder of Mysteries
5.7%inclusion2 decks35 decks
4%synergy
Teferi, Time Raveler
5.7%inclusion2 decks35 decks
-3%synergy
Utility Lands
Bojuka Bog
49%inclusion17 decks35 decks
21%synergy
Reliquary Tower
20%inclusion7 decks35 decks
-14%synergy
Cephalid Coliseum
20%inclusion7 decks35 decks
16%synergy
Halimar Depths
17%inclusion6 decks35 decks
12%synergy
Nephalia Drownyard
14%inclusion5 decks35 decks
14%synergy
Otawara, Soaring City
11%inclusion4 decks35 decks
-8%synergy
Ishgard, the Holy See
10%inclusion2 decks20 decks
6%synergy
Vault of the Archangel
8.6%inclusion3 decks35 decks
2%synergy
Mystic Sanctuary
5.7%inclusion2 decks35 decks
2%synergy
Geier Reach Sanitarium
5.7%inclusion2 decks35 decks
1%synergy
Takenuma, Abandoned Mire
5.7%inclusion2 decks35 decks
-1%synergy
Urborg, Tomb of Yawgmoth
5.7%inclusion2 decks35 decks
-8%synergy
Jidoor, Aristocratic Capital
5.0%inclusion1 decks20 decks
4%synergy
Mana Artifacts
Arcane Signet
89%inclusion31 decks35 decks
1%synergy
Sol Ring
89%inclusion31 decks35 decks
-1%synergy
Talisman of Progress
57%inclusion20 decks35 decks
14%synergy
Talisman of Dominance
57%inclusion20 decks35 decks
8%synergy
Talisman of Hierarchy
54%inclusion19 decks35 decks
11%synergy
Azorius Signet
31%inclusion11 decks35 decks
-1%synergy
Fellwar Stone
29%inclusion10 decks35 decks
-5%synergy
Orzhov Signet
26%inclusion9 decks35 decks
-9%synergy
Dimir Signet
20%inclusion7 decks35 decks
-13%synergy
Commander's Sphere
17%inclusion6 decks35 decks
-2%synergy
Mind Stone
14%inclusion5 decks35 decks
1%synergy
Chromatic Lantern
5.7%inclusion2 decks35 decks
-8%synergy
Thought Vessel
5.7%inclusion2 decks35 decks
-19%synergy
Lands
Command Tower
100%inclusion35 decks35 decks
8%synergy
Swamp
97%inclusion34 decks35 decks
6%synergy
Island
97%inclusion34 decks35 decks
5%synergy
Plains
97%inclusion34 decks35 decks
6%synergy
Arcane Sanctum
71%inclusion25 decks35 decks
17%synergy
Exotic Orchard
63%inclusion22 decks35 decks
4%synergy
Adarkar Wastes
63%inclusion22 decks35 decks
32%synergy
Caves of Koilos
57%inclusion20 decks35 decks
22%synergy
Underground River
57%inclusion20 decks35 decks
25%synergy
Isolated Chapel
54%inclusion19 decks35 decks
16%synergy
Glacial Fortress
49%inclusion17 decks35 decks
9%synergy
Prairie Stream
46%inclusion16 decks35 decks
5%synergy
Temple of Silence
43%inclusion15 decks35 decks
23%synergy
Temple of Deceit
40%inclusion14 decks35 decks
22%synergy
Valgavoth's Lair
40%inclusion14 decks35 decks
37%synergy
Temple of Enlightenment
40%inclusion14 decks35 decks
23%synergy
Evolving Wilds
40%inclusion14 decks35 decks
15%synergy
Sunken Hollow
40%inclusion14 decks35 decks
0%synergy
Terramorphic Expanse
37%inclusion13 decks35 decks
20%synergy
Godless Shrine
37%inclusion13 decks35 decks
-13%synergy
Drowned Catacomb
37%inclusion13 decks35 decks
2%synergy
Watery Grave
37%inclusion13 decks35 decks
-12%synergy
Polluted Delta
34%inclusion12 decks35 decks
-3%synergy
Hallowed Fountain
34%inclusion12 decks35 decks
-15%synergy
Raffine's Tower
31%inclusion11 decks35 decks
-10%synergy
Vault of Champions
31%inclusion11 decks35 decks
-1%synergy
Flooded Strand
31%inclusion11 decks35 decks
-6%synergy
Obscura Storefront
31%inclusion11 decks35 decks
21%synergy
Gloomlake Verge
29%inclusion10 decks35 decks
18%synergy
Marsh Flats
29%inclusion10 decks35 decks
-8%synergy
Shadowy Backstreet
26%inclusion9 decks35 decks
13%synergy
Azorius Chancery
26%inclusion9 decks35 decks
11%synergy
Dimir Aqueduct
26%inclusion9 decks35 decks
12%synergy
Sea of Clouds
26%inclusion9 decks35 decks
-10%synergy
Floodfarm Verge
26%inclusion9 decks35 decks
15%synergy
Meticulous Archive
26%inclusion9 decks35 decks
12%synergy
Undercity Sewers
23%inclusion8 decks35 decks
9%synergy
Contaminated Landscape
23%inclusion8 decks35 decks
8%synergy
Ash Barrens
23%inclusion8 decks35 decks
12%synergy
Shipwreck Marsh
23%inclusion8 decks35 decks
2%synergy
Morphic Pool
23%inclusion8 decks35 decks
-12%synergy
Deserted Beach
23%inclusion8 decks35 decks
2%synergy
Orzhov Basilica
20%inclusion7 decks35 decks
4%synergy
Tainted Isle
17%inclusion6 decks35 decks
11%synergy
Tainted Field
17%inclusion6 decks35 decks
10%synergy
Path of Ancestry
17%inclusion6 decks35 decks
-10%synergy
Fabled Passage
14%inclusion5 decks35 decks
7%synergy
Fetid Heath
14%inclusion5 decks35 decks
3%synergy
Myriad Landscape
14%inclusion5 decks35 decks
5%synergy
Shineshadow Snarl
14%inclusion5 decks35 decks
4%synergy
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