The Master of Keys (Commander) - Upgraded 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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Enchantments
Battles
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Utility Lands
Mana Artifacts
Lands
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Mornsong Aria
33%inclusion2 decks6 decks
33%synergy
Twilight Diviner
20%inclusion1 decks5 decks
19%synergy
High Synergy Cards
Inquisitive Glimmer
85%inclusion33 decks39 decks
77%synergy
Gravebreaker Lamia
74%inclusion29 decks39 decks
73%synergy
Ripples of Undeath
74%inclusion29 decks39 decks
72%synergy
Entity Tracker
77%inclusion30 decks39 decks
71%synergy
Animate Dead
72%inclusion28 decks39 decks
62%synergy
Demon of Fate's Design
67%inclusion26 decks39 decks
61%synergy
Fear of Sleep Paralysis
67%inclusion26 decks39 decks
61%synergy
Mesa Enchantress
69%inclusion27 decks39 decks
60%synergy
Starfield Mystic
67%inclusion26 decks39 decks
60%synergy
Scrabbling Skullcrab
59%inclusion23 decks39 decks
58%synergy
Top Cards
Doomwake Giant
62%inclusion24 decks39 decks
56%synergy
Mirrormade
59%inclusion23 decks39 decks
49%synergy
Necromancy
56%inclusion22 decks39 decks
52%synergy
Swords to Plowshares
56%inclusion22 decks39 decks
-12%synergy
Dress Down
56%inclusion22 decks39 decks
54%synergy
Ondu Spiritdancer
54%inclusion21 decks39 decks
48%synergy
Overlord of the Floodpits
51%inclusion20 decks39 decks
48%synergy
Mystic Remora
51%inclusion20 decks39 decks
30%synergy
Victor, Valgavoth's Seneschal
51%inclusion20 decks39 decks
49%synergy
Sphere of Safety
51%inclusion20 decks39 decks
42%synergy
Game Changers
Smothering Tithe
33%inclusion13 decks39 decks
2%synergy
Rhystic Study
21%inclusion8 decks39 decks
-12%synergy
Enlightened Tutor
13%inclusion5 decks39 decks
-7%synergy
Consecrated Sphinx
10%inclusion4 decks39 decks
4%synergy
Necropotence
7.7%inclusion3 decks39 decks
1%synergy
Thassa's Oracle
5.1%inclusion2 decks39 decks
-5%synergy
Serra's Sanctum
5.1%inclusion2 decks39 decks
3%synergy
Gifts Ungiven
5.1%inclusion2 decks39 decks
3%synergy
Demonic Tutor
5.1%inclusion2 decks39 decks
-16%synergy
Creatures
Overlord of the Balemurk
49%inclusion19 decks39 decks
47%synergy
Zur, Eternal Schemer
46%inclusion18 decks39 decks
43%synergy
Ghostly Dancers
41%inclusion16 decks39 decks
38%synergy
Silent Hallcreeper
36%inclusion14 decks39 decks
32%synergy
Heliod, the Radiant Dawn
36%inclusion14 decks39 decks
32%synergy
Fear of Impostors
31%inclusion12 decks39 decks
29%synergy
Enduring Curiosity
31%inclusion12 decks39 decks
23%synergy
Grim Guardian
31%inclusion12 decks39 decks
28%synergy
Sage of Mysteries
26%inclusion10 decks39 decks
25%synergy
Mindwrack Harpy
26%inclusion10 decks39 decks
25%synergy
Athreos, Shroud-Veiled
23%inclusion9 decks39 decks
19%synergy
Balemurk Leech
23%inclusion9 decks39 decks
22%synergy
Lotho, Corrupt Shirriff
21%inclusion8 decks39 decks
4%synergy
Archon of Sun's Grace
21%inclusion8 decks39 decks
16%synergy
Soaring Lightbringer
21%inclusion8 decks39 decks
16%synergy
Abdel Adrian, Gorion's Ward
21%inclusion8 decks39 decks
19%synergy
Moon-Blessed Cleric
18%inclusion7 decks39 decks
13%synergy
Archetype of Imagination
18%inclusion7 decks39 decks
13%synergy
Hullbreaker Horror
18%inclusion7 decks39 decks
12%synergy
Starnheim Courser
15%inclusion6 decks39 decks
11%synergy
Skullsnap Nuisance
15%inclusion6 decks39 decks
15%synergy
Aminatou, Veil Piercer
15%inclusion6 decks39 decks
14%synergy
Alseid of Life's Bounty
15%inclusion6 decks39 decks
14%synergy
Zur the Enchanter
15%inclusion6 decks39 decks
10%synergy
Overlord of the Mistmoors
13%inclusion5 decks39 decks
11%synergy
Spirited Companion
13%inclusion5 decks39 decks
11%synergy
Athreos, God of Passage
13%inclusion5 decks39 decks
11%synergy
Ancient Cellarspawn
13%inclusion5 decks39 decks
10%synergy
Grand Abolisher
13%inclusion5 decks39 decks
-2%synergy
Ledger Shredder
13%inclusion5 decks39 decks
4%synergy
Emet-Selch of the Third Seat
12%inclusion3 decks25 decks
2%synergy
Fear of Infinity
10%inclusion4 decks39 decks
10%synergy
Valley Floodcaller
10%inclusion4 decks39 decks
6%synergy
Hedron Crab
10%inclusion4 decks39 decks
10%synergy
Laboratory Maniac
10%inclusion4 decks39 decks
7%synergy
Neerdiv, Devious Diver
10%inclusion4 decks39 decks
10%synergy
Summon: Bahamut
8.0%inclusion2 decks25 decks
7%synergy
Witch Enchanter
7.7%inclusion3 decks39 decks
1%synergy
Stenn, Paranoid Partisan
7.7%inclusion3 decks39 decks
6%synergy
Syr Konrad, the Grim
7.7%inclusion3 decks39 decks
2%synergy
The Mindskinner
7.7%inclusion3 decks39 decks
7%synergy
Lurrus of the Dream-Den
7.7%inclusion3 decks39 decks
6%synergy
Doom Whisperer
7.7%inclusion3 decks39 decks
6%synergy
Vilis, Broker of Blood
7.7%inclusion3 decks39 decks
7%synergy
Nashi, Searcher in the Dark
7.7%inclusion3 decks39 decks
7%synergy
Nightmare Shepherd
7.7%inclusion3 decks39 decks
5%synergy
Auramancer
7.7%inclusion3 decks39 decks
5%synergy
Summon: Shiva
5.4%inclusion2 decks37 decks
5%synergy
Solemn Simulacrum
5.1%inclusion2 decks39 decks
-9%synergy
Phenax, God of Deception
5.1%inclusion2 decks39 decks
5%synergy
Instants
An Offer You Can't Refuse
49%inclusion19 decks39 decks
22%synergy
Arcane Denial
49%inclusion19 decks39 decks
28%synergy
Counterspell
49%inclusion19 decks39 decks
7%synergy
Path to Exile
41%inclusion16 decks39 decks
-1%synergy
Dark Ritual
36%inclusion14 decks39 decks
16%synergy
Entomb
26%inclusion10 decks39 decks
19%synergy
Negate
26%inclusion10 decks39 decks
9%synergy
Void Rend
26%inclusion10 decks39 decks
-8%synergy
Frantic Search
18%inclusion7 decks39 decks
0%synergy
Thirst for Meaning
18%inclusion7 decks39 decks
16%synergy
Dovin's Veto
15%inclusion6 decks39 decks
-10%synergy
Strix Serenade
15%inclusion6 decks39 decks
12%synergy
Swan Song
15%inclusion6 decks39 decks
-4%synergy
Anguished Unmaking
15%inclusion6 decks39 decks
-10%synergy
Generous Gift
15%inclusion6 decks39 decks
1%synergy
Brainstorm
13%inclusion5 decks39 decks
-4%synergy
Fell the Profane
10%inclusion4 decks39 decks
1%synergy
Otherworldly Gaze
10%inclusion4 decks39 decks
8%synergy
Utter End
10%inclusion4 decks39 decks
4%synergy
Inkshield
10%inclusion4 decks39 decks
1%synergy
Cabal Ritual
7.7%inclusion3 decks39 decks
4%synergy
Withering Torment
7.7%inclusion3 decks39 decks
6%synergy
Return to Dust
5.1%inclusion2 decks39 decks
1%synergy
Dawn's Truce
5.1%inclusion2 decks39 decks
1%synergy
Flawless Maneuver
5.1%inclusion2 decks39 decks
-3%synergy
Flare of Fortitude
5.1%inclusion2 decks39 decks
3%synergy
Angel's Grace
5.1%inclusion2 decks39 decks
2%synergy
Flusterstorm
5.1%inclusion2 decks39 decks
-3%synergy
Disallow
5.1%inclusion2 decks39 decks
2%synergy
Silence
5.1%inclusion2 decks39 decks
-5%synergy
Into the Flood Maw
5.1%inclusion2 decks39 decks
1%synergy
Snap
5.1%inclusion2 decks39 decks
3%synergy
Faithful Mending
5.1%inclusion2 decks39 decks
1%synergy
Sink into Stupor
5.1%inclusion2 decks39 decks
-8%synergy
Waterlogged Teachings
5.1%inclusion2 decks39 decks
1%synergy
Snapback
5.1%inclusion2 decks39 decks
5%synergy
Sorceries
Sevinne's Reclamation
46%inclusion18 decks39 decks
37%synergy
Redress Fate
44%inclusion17 decks39 decks
38%synergy
Dance of the Manse
36%inclusion14 decks39 decks
32%synergy
Windfall
33%inclusion13 decks39 decks
20%synergy
Reanimate
33%inclusion13 decks39 decks
17%synergy
Glimpse the Unthinkable
23%inclusion9 decks39 decks
23%synergy
Singularity Rupture
22%inclusion5 decks23 decks
19%synergy
Space-Time Anomaly
22%inclusion5 decks23 decks
20%synergy
Extinguish All Hope
21%inclusion8 decks39 decks
19%synergy
Wrath of God
18%inclusion7 decks39 decks
14%synergy
Unmarked Grave
13%inclusion5 decks39 decks
11%synergy
Toxic Deluge
13%inclusion5 decks39 decks
-7%synergy
Traumatize
13%inclusion5 decks39 decks
12%synergy
Supreme Verdict
10%inclusion4 decks39 decks
-5%synergy
Open the Vaults
10%inclusion4 decks39 decks
9%synergy
Time Wipe
10%inclusion4 decks39 decks
3%synergy
Farewell
10%inclusion4 decks39 decks
-3%synergy
Demonic Counsel
10%inclusion4 decks39 decks
9%synergy
Damn
10%inclusion4 decks39 decks
-10%synergy
Ponder
7.7%inclusion3 decks39 decks
-1%synergy
Lively Dirge
7.7%inclusion3 decks39 decks
6%synergy
Terminus
7.7%inclusion3 decks39 decks
4%synergy
Cut Your Losses
7.7%inclusion3 decks39 decks
7%synergy
Idyllic Tutor
7.7%inclusion3 decks39 decks
3%synergy
Night's Whisper
7.7%inclusion3 decks39 decks
5%synergy
Buried Alive
7.7%inclusion3 decks39 decks
4%synergy
Rise of the Dark Realms
7.7%inclusion3 decks39 decks
5%synergy
Commune with Evil
5.1%inclusion2 decks39 decks
5%synergy
Austere Command
5.1%inclusion2 decks39 decks
-4%synergy
Incarnation Technique
5.1%inclusion2 decks39 decks
4%synergy
Triumphant Reckoning
5.1%inclusion2 decks39 decks
5%synergy
Resurgent Belief
5.1%inclusion2 decks39 decks
3%synergy
Dread Return
5.1%inclusion2 decks39 decks
2%synergy
Replenish
5.1%inclusion2 decks39 decks
3%synergy
Diabolic Vision
5.1%inclusion2 decks39 decks
3%synergy
Day of Judgment
5.1%inclusion2 decks39 decks
4%synergy
Approach of the Second Sun
5.1%inclusion2 decks39 decks
1%synergy
Breach the Multiverse
5.1%inclusion2 decks39 decks
3%synergy
Utility Artifacts
Mesmeric Orb
28%inclusion11 decks39 decks
27%synergy
Cloud Key
21%inclusion8 decks39 decks
17%synergy
Lightning Greaves
18%inclusion7 decks39 decks
-4%synergy
Swiftfoot Boots
13%inclusion5 decks39 decks
-11%synergy
Whip of Erebos
7.7%inclusion3 decks39 decks
5%synergy
Pearl Medallion
5.1%inclusion2 decks39 decks
4%synergy
Wayfarer's Bauble
5.1%inclusion2 decks39 decks
-3%synergy
Crucible of Worlds
5.1%inclusion2 decks39 decks
4%synergy
Mask of the Schemer
5.1%inclusion2 decks39 decks
4%synergy
Altar of the Brood
5.1%inclusion2 decks39 decks
4%synergy
Mindcrank
5.1%inclusion2 decks39 decks
3%synergy
Enchantments
Cemetery Tampering
51%inclusion20 decks39 decks
51%synergy
Secret Arcade // Dusty Parlor
51%inclusion20 decks39 decks
46%synergy
Grasp of Fate
49%inclusion19 decks39 decks
43%synergy
Propaganda
49%inclusion19 decks39 decks
22%synergy
Estrid's Invocation
46%inclusion18 decks39 decks
42%synergy
Sigil of the Empty Throne
41%inclusion16 decks39 decks
35%synergy
Seal of Cleansing
41%inclusion16 decks39 decks
40%synergy
Ghostly Prison
41%inclusion16 decks39 decks
19%synergy
Blind Obedience
38%inclusion15 decks39 decks
26%synergy
Amphibian Downpour
38%inclusion15 decks39 decks
34%synergy
Cacophony Unleashed
33%inclusion13 decks39 decks
32%synergy
Stillness in Motion
33%inclusion11 decks33 decks
33%synergy
The Meathook Massacre
31%inclusion12 decks39 decks
27%synergy
Out of the Tombs
31%inclusion12 decks39 decks
30%synergy
Starfield of Nyx
31%inclusion12 decks39 decks
27%synergy
Timely Ward
28%inclusion11 decks39 decks
23%synergy
Secrets of the Dead
28%inclusion11 decks39 decks
28%synergy
Polluted Cistern // Dim Oubliette
28%inclusion11 decks39 decks
28%synergy
Defiled Crypt // Cadaver Lab
28%inclusion11 decks39 decks
27%synergy
Touch the Spirit Realm
26%inclusion10 decks39 decks
23%synergy
Copy Enchantment
26%inclusion10 decks39 decks
21%synergy
The Tale of Tamiyo
26%inclusion10 decks39 decks
25%synergy
Monologue Tax
26%inclusion10 decks39 decks
19%synergy
Teval's Judgment
24%inclusion8 decks34 decks
23%synergy
Dance of the Dead
23%inclusion9 decks39 decks
21%synergy
Court of Cunning
23%inclusion9 decks39 decks
22%synergy
Extravagant Replication
23%inclusion9 decks39 decks
18%synergy
Greater Auramancy
23%inclusion9 decks39 decks
19%synergy
Phyrexian Arena
23%inclusion9 decks39 decks
9%synergy
Darksteel Mutation
21%inclusion8 decks39 decks
14%synergy
Authority of the Consuls
21%inclusion8 decks39 decks
9%synergy
Ethereal Armor
21%inclusion8 decks39 decks
16%synergy
Hallowed Haunting
21%inclusion8 decks39 decks
18%synergy
Shark Typhoon
18%inclusion7 decks39 decks
12%synergy
Leyline of Anticipation
18%inclusion7 decks39 decks
13%synergy
All That Glitters
18%inclusion7 decks39 decks
9%synergy
One with the Multiverse
15%inclusion6 decks39 decks
11%synergy
Restricted Office // Lecture Hall
15%inclusion6 decks39 decks
13%synergy
Seal of Removal
15%inclusion6 decks39 decks
15%synergy
Virtue of Persistence
15%inclusion6 decks39 decks
14%synergy
Static Prison
13%inclusion5 decks39 decks
12%synergy
Bottomless Pool // Locker Room
13%inclusion5 decks39 decks
11%synergy
Aura of Silence
13%inclusion5 decks39 decks
10%synergy
The Eldest Reborn
10%inclusion4 decks39 decks
8%synergy
Sanguine Bond
10%inclusion4 decks39 decks
3%synergy
Omniscience
10%inclusion4 decks39 decks
6%synergy
Exquisite Blood
10%inclusion4 decks39 decks
4%synergy
Dazzling Theater // Prop Room
10%inclusion4 decks39 decks
9%synergy
Sheltered by Ghosts
10%inclusion4 decks39 decks
8%synergy
Solitary Confinement
10%inclusion4 decks39 decks
8%synergy
Battles
Invasion of Theros
5.1%inclusion2 decks39 decks
3%synergy
Planeswalkers
Jace, Wielder of Mysteries
5.1%inclusion2 decks39 decks
3%synergy
Teferi, Time Raveler
5.1%inclusion2 decks39 decks
-3%synergy
Utility Lands
Hall of Heliod's Generosity
69%inclusion27 decks39 decks
56%synergy
Bojuka Bog
46%inclusion18 decks39 decks
19%synergy
Cephalid Coliseum
21%inclusion8 decks39 decks
17%synergy
Reliquary Tower
18%inclusion7 decks39 decks
-16%synergy
Halimar Depths
15%inclusion6 decks39 decks
11%synergy
Nephalia Drownyard
13%inclusion5 decks39 decks
12%synergy
Otawara, Soaring City
13%inclusion5 decks39 decks
-6%synergy
Takenuma, Abandoned Mire
10%inclusion4 decks39 decks
4%synergy
Ishgard, the Holy See
8.0%inclusion2 decks25 decks
4%synergy
Mystic Sanctuary
7.7%inclusion3 decks39 decks
4%synergy
Geier Reach Sanitarium
7.7%inclusion3 decks39 decks
3%synergy
Vault of the Archangel
7.7%inclusion3 decks39 decks
1%synergy
Urborg, Tomb of Yawgmoth
5.1%inclusion2 decks39 decks
-8%synergy
Mana Artifacts
Arcane Signet
87%inclusion34 decks39 decks
-1%synergy
Sol Ring
85%inclusion33 decks39 decks
-5%synergy
Talisman of Dominance
59%inclusion23 decks39 decks
9%synergy
Talisman of Progress
56%inclusion22 decks39 decks
13%synergy
Talisman of Hierarchy
56%inclusion22 decks39 decks
13%synergy
Azorius Signet
33%inclusion13 decks39 decks
2%synergy
Fellwar Stone
31%inclusion12 decks39 decks
-3%synergy
Orzhov Signet
28%inclusion11 decks39 decks
-6%synergy
Dimir Signet
23%inclusion9 decks39 decks
-9%synergy
Commander's Sphere
15%inclusion6 decks39 decks
-3%synergy
Mind Stone
13%inclusion5 decks39 decks
0%synergy
Chromatic Lantern
5.1%inclusion2 decks39 decks
-8%synergy
Thought Vessel
5.1%inclusion2 decks39 decks
-20%synergy
Lands
Command Tower
100%inclusion39 decks39 decks
7%synergy
Swamp
97%inclusion38 decks39 decks
6%synergy
Island
97%inclusion38 decks39 decks
5%synergy
Plains
97%inclusion38 decks39 decks
6%synergy
Arcane Sanctum
69%inclusion27 decks39 decks
15%synergy
Exotic Orchard
67%inclusion26 decks39 decks
8%synergy
Adarkar Wastes
67%inclusion26 decks39 decks
36%synergy
Caves of Koilos
62%inclusion24 decks39 decks
26%synergy
Underground River
62%inclusion24 decks39 decks
28%synergy
Isolated Chapel
54%inclusion21 decks39 decks
15%synergy
Glacial Fortress
49%inclusion19 decks39 decks
8%synergy
Godless Shrine
44%inclusion17 decks39 decks
-7%synergy
Watery Grave
44%inclusion17 decks39 decks
-7%synergy
Prairie Stream
41%inclusion16 decks39 decks
0%synergy
Polluted Delta
41%inclusion16 decks39 decks
3%synergy
Hallowed Fountain
41%inclusion16 decks39 decks
-8%synergy
Valgavoth's Lair
38%inclusion15 decks39 decks
36%synergy
Drowned Catacomb
38%inclusion15 decks39 decks
2%synergy
Sunken Hollow
38%inclusion15 decks39 decks
-1%synergy
Temple of Silence
38%inclusion15 decks39 decks
19%synergy
Flooded Strand
38%inclusion15 decks39 decks
0%synergy
Temple of Deceit
36%inclusion14 decks39 decks
18%synergy
Raffine's Tower
36%inclusion14 decks39 decks
-5%synergy
Temple of Enlightenment
36%inclusion14 decks39 decks
19%synergy
Evolving Wilds
36%inclusion14 decks39 decks
11%synergy
Terramorphic Expanse
33%inclusion13 decks39 decks
17%synergy
Marsh Flats
33%inclusion13 decks39 decks
-3%synergy
Shadowy Backstreet
31%inclusion12 decks39 decks
18%synergy
Vault of Champions
31%inclusion12 decks39 decks
-2%synergy
Sea of Clouds
28%inclusion11 decks39 decks
-7%synergy
Meticulous Archive
28%inclusion11 decks39 decks
15%synergy
Gloomlake Verge
28%inclusion11 decks39 decks
17%synergy
Obscura Storefront
28%inclusion11 decks39 decks
18%synergy
Undercity Sewers
26%inclusion10 decks39 decks
11%synergy
Azorius Chancery
26%inclusion10 decks39 decks
11%synergy
Dimir Aqueduct
26%inclusion10 decks39 decks
12%synergy
Floodfarm Verge
26%inclusion10 decks39 decks
14%synergy
Morphic Pool
23%inclusion9 decks39 decks
-11%synergy
Deserted Beach
23%inclusion9 decks39 decks
2%synergy
Contaminated Landscape
21%inclusion8 decks39 decks
6%synergy
Ash Barrens
21%inclusion8 decks39 decks
10%synergy
Shipwreck Marsh
21%inclusion8 decks39 decks
0%synergy
Orzhov Basilica
18%inclusion7 decks39 decks
2%synergy
Tainted Isle
15%inclusion6 decks39 decks
9%synergy
Fetid Heath
15%inclusion6 decks39 decks
3%synergy
Tainted Field
15%inclusion6 decks39 decks
8%synergy
Path of Ancestry
15%inclusion6 decks39 decks
-12%synergy
Fabled Passage
13%inclusion5 decks39 decks
5%synergy
Myriad Landscape
13%inclusion5 decks39 decks
4%synergy
Skycloud Expanse
13%inclusion5 decks39 decks
-2%synergy
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