The Master of Keys (Commander) - 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
Battles
Planeswalkers
Utility Lands
Mana Artifacts
Lands
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Mornsong Aria
13%inclusion3 decks24 decks
12%synergy
Twilight Diviner
4.5%inclusion1 decks22 decks
4%synergy
Noggle the Mind
4.5%inclusion1 decks22 decks
4%synergy
Voracious Tome-Skimmer
4.2%inclusion1 decks24 decks
4%synergy
Dawnhand Dissident
4.2%inclusion1 decks24 decks
4%synergy
High Synergy Cards
Ripples of Undeath
65%inclusion185 decks286 decks
62%synergy
Animate Dead
70%inclusion201 decks286 decks
61%synergy
Necromancy
60%inclusion173 decks286 decks
56%synergy
Dress Down
57%inclusion164 decks286 decks
55%synergy
Inquisitive Glimmer
58%inclusion165 decks286 decks
50%synergy
Scrabbling Skullcrab
44%inclusion127 decks286 decks
43%synergy
Entity Tracker
49%inclusion140 decks286 decks
43%synergy
Mesa Enchantress
50%inclusion144 decks286 decks
41%synergy
Gravebreaker Lamia
42%inclusion120 decks286 decks
41%synergy
Dance of the Dead
42%inclusion121 decks286 decks
40%synergy
Top Cards
Mystic Remora
61%inclusion175 decks286 decks
40%synergy
Swords to Plowshares
58%inclusion167 decks286 decks
-10%synergy
Sevinne's Reclamation
49%inclusion139 decks286 decks
40%synergy
Starfield Mystic
44%inclusion125 decks286 decks
37%synergy
Overlord of the Balemurk
42%inclusion119 decks286 decks
40%synergy
Entomb
42%inclusion119 decks286 decks
35%synergy
Demon of Fate's Design
41%inclusion118 decks286 decks
36%synergy
Dark Ritual
41%inclusion117 decks286 decks
21%synergy
Blind Obedience
38%inclusion110 decks286 decks
26%synergy
Mirrormade
38%inclusion109 decks286 decks
28%synergy
Game Changers
Smothering Tithe
51%inclusion146 decks286 decks
19%synergy
Rhystic Study
47%inclusion134 decks286 decks
15%synergy
Enlightened Tutor
40%inclusion114 decks286 decks
20%synergy
Demonic Tutor
32%inclusion92 decks286 decks
11%synergy
Thassa's Oracle
30%inclusion87 decks286 decks
21%synergy
Vampiric Tutor
28%inclusion79 decks286 decks
10%synergy
Ancient Tomb
27%inclusion76 decks286 decks
13%synergy
Force of Will
24%inclusion70 decks286 decks
12%synergy
Mana Vault
24%inclusion69 decks286 decks
15%synergy
Fierce Guardianship
23%inclusion65 decks286 decks
2%synergy
Creatures
Doomwake Giant
37%inclusion107 decks286 decks
32%synergy
Overlord of the Floodpits
37%inclusion106 decks286 decks
33%synergy
Fear of Sleep Paralysis
36%inclusion102 decks286 decks
30%synergy
Victor, Valgavoth's Seneschal
33%inclusion93 decks286 decks
31%synergy
Abdel Adrian, Gorion's Ward
33%inclusion93 decks286 decks
31%synergy
Esper Sentinel
32%inclusion92 decks286 decks
4%synergy
Fear of Impostors
32%inclusion91 decks286 decks
30%synergy
Ondu Spiritdancer
30%inclusion86 decks286 decks
24%synergy
Lotho, Corrupt Shirriff
28%inclusion81 decks286 decks
11%synergy
Grand Abolisher
27%inclusion76 decks286 decks
12%synergy
Zur, Eternal Schemer
26%inclusion75 decks286 decks
23%synergy
Orcish Bowmasters
22%inclusion64 decks286 decks
11%synergy
Heliod, the Radiant Dawn
22%inclusion64 decks286 decks
19%synergy
Valley Floodcaller
22%inclusion63 decks286 decks
18%synergy
Silent Hallcreeper
22%inclusion63 decks286 decks
18%synergy
Grim Guardian
22%inclusion62 decks286 decks
19%synergy
Zur the Enchanter
22%inclusion62 decks286 decks
16%synergy
Ghostly Dancers
22%inclusion62 decks286 decks
19%synergy
Enduring Curiosity
21%inclusion61 decks286 decks
14%synergy
Hullbreaker Horror
20%inclusion56 decks286 decks
13%synergy
Hedron Crab
19%inclusion55 decks286 decks
19%synergy
Ranger-Captain of Eos
19%inclusion53 decks286 decks
12%synergy
Mindwrack Harpy
19%inclusion53 decks286 decks
18%synergy
Wan Shi Tong, Librarian
18%inclusion10 decks56 decks
13%synergy
Displacer Kitten
18%inclusion51 decks286 decks
11%synergy
Ledger Shredder
16%inclusion47 decks286 decks
8%synergy
Lurrus of the Dream-Den
15%inclusion43 decks286 decks
13%synergy
Sage of Mysteries
15%inclusion43 decks286 decks
15%synergy
Alseid of Life's Bounty
15%inclusion43 decks286 decks
14%synergy
Archon of Sun's Grace
15%inclusion42 decks286 decks
10%synergy
Moon-Blessed Cleric
14%inclusion41 decks286 decks
10%synergy
Skullsnap Nuisance
14%inclusion41 decks286 decks
14%synergy
Voice of Victory
14%inclusion21 decks147 decks
6%synergy
Soaring Lightbringer
14%inclusion39 decks286 decks
9%synergy
Aminatou, Veil Piercer
14%inclusion39 decks286 decks
12%synergy
Overlord of the Mistmoors
13%inclusion36 decks286 decks
10%synergy
Balemurk Leech
13%inclusion36 decks286 decks
12%synergy
Opposition Agent
12%inclusion35 decks286 decks
3%synergy
Mockingbird
12%inclusion34 decks286 decks
7%synergy
Laboratory Maniac
11%inclusion31 decks286 decks
8%synergy
Drannith Magistrate
11%inclusion31 decks286 decks
3%synergy
Tataru Taru
11%inclusion13 decks120 decks
3%synergy
Spirited Companion
10%inclusion30 decks286 decks
9%synergy
Stitcher's Supplier
10%inclusion29 decks286 decks
9%synergy
The Mindskinner
10%inclusion29 decks286 decks
9%synergy
Athreos, Shroud-Veiled
10%inclusion28 decks286 decks
5%synergy
Ancient Cellarspawn
10%inclusion28 decks286 decks
7%synergy
Archivist of Oghma
9.4%inclusion27 decks286 decks
3%synergy
Nashi, Searcher in the Dark
9.4%inclusion27 decks286 decks
9%synergy
Millikin
9.4%inclusion27 decks286 decks
9%synergy
Instants
An Offer You Can't Refuse
34%inclusion98 decks286 decks
7%synergy
Counterspell
33%inclusion93 decks286 decks
-9%synergy
Swan Song
30%inclusion85 decks286 decks
10%synergy
Path to Exile
28%inclusion79 decks286 decks
-14%synergy
Arcane Denial
26%inclusion74 decks286 decks
6%synergy
Silence
25%inclusion71 decks286 decks
14%synergy
Demonic Consultation
22%inclusion62 decks286 decks
13%synergy
Force of Negation
22%inclusion62 decks286 decks
10%synergy
Flusterstorm
21%inclusion59 decks286 decks
12%synergy
Tainted Pact
20%inclusion58 decks286 decks
13%synergy
Intuition
20%inclusion57 decks286 decks
18%synergy
Mental Misstep
20%inclusion56 decks286 decks
13%synergy
Cyclonic Rift
20%inclusion56 decks286 decks
-5%synergy
Mystical Tutor
19%inclusion55 decks286 decks
8%synergy
Borne Upon a Wind
19%inclusion55 decks286 decks
14%synergy
Mindbreak Trap
19%inclusion54 decks286 decks
12%synergy
Cabal Ritual
19%inclusion53 decks286 decks
15%synergy
Pact of Negation
19%inclusion53 decks286 decks
11%synergy
Dovin's Veto
17%inclusion50 decks286 decks
-8%synergy
Void Rend
17%inclusion49 decks286 decks
-17%synergy
Sink into Stupor
16%inclusion46 decks286 decks
3%synergy
Mana Drain
15%inclusion42 decks286 decks
-3%synergy
Frantic Search
15%inclusion42 decks286 decks
-3%synergy
Otherworldly Gaze
15%inclusion42 decks286 decks
12%synergy
Thirst for Meaning
14%inclusion39 decks286 decks
12%synergy
Negate
11%inclusion31 decks286 decks
-6%synergy
Gifts Ungiven
11%inclusion31 decks286 decks
8%synergy
Into the Flood Maw
11%inclusion31 decks286 decks
7%synergy
Fell the Profane
9.1%inclusion26 decks286 decks
0%synergy
Brainstorm
8.7%inclusion25 decks286 decks
-8%synergy
Anguished Unmaking
8.4%inclusion24 decks286 decks
-17%synergy
Chain of Vapor
8.4%inclusion24 decks286 decks
5%synergy
Strix Serenade
7.7%inclusion22 decks286 decks
4%synergy
Retraction Helix
7.0%inclusion20 decks286 decks
6%synergy
Brain Freeze
6.6%inclusion19 decks286 decks
6%synergy
Faithful Mending
6.6%inclusion19 decks286 decks
3%synergy
Inkshield
6.6%inclusion19 decks286 decks
-3%synergy
Thought Scour
6.3%inclusion18 decks286 decks
5%synergy
Generous Gift
5.6%inclusion16 decks286 decks
-9%synergy
Sorceries
Reanimate
30%inclusion85 decks286 decks
14%synergy
Windfall
29%inclusion82 decks286 decks
15%synergy
Redress Fate
25%inclusion71 decks286 decks
19%synergy
Toxic Deluge
20%inclusion57 decks286 decks
0%synergy
Imperial Seal
19%inclusion54 decks286 decks
11%synergy
Singularity Rupture
17%inclusion17 decks100 decks
15%synergy
Dance of the Manse
16%inclusion46 decks286 decks
13%synergy
Space-Time Anomaly
14%inclusion14 decks97 decks
13%synergy
Glimpse the Unthinkable
13%inclusion38 decks286 decks
13%synergy
Damn
13%inclusion37 decks286 decks
-8%synergy
Demonic Counsel
13%inclusion36 decks286 decks
12%synergy
Lively Dirge
12%inclusion34 decks286 decks
11%synergy
Extinguish All Hope
11%inclusion32 decks286 decks
10%synergy
Unmarked Grave
8.4%inclusion24 decks286 decks
7%synergy
Resurgent Belief
8.0%inclusion23 decks286 decks
6%synergy
Breach the Multiverse
8.0%inclusion23 decks286 decks
6%synergy
Beseech the Mirror
7.7%inclusion22 decks286 decks
4%synergy
Traumatize
7.3%inclusion21 decks286 decks
7%synergy
Supreme Verdict
7.0%inclusion20 decks286 decks
-8%synergy
Idyllic Tutor
7.0%inclusion20 decks286 decks
3%synergy
Wrath of God
6.6%inclusion19 decks286 decks
3%synergy
Time Wipe
6.6%inclusion19 decks286 decks
0%synergy
Cut Your Losses
6.3%inclusion18 decks286 decks
6%synergy
Ponder
6.3%inclusion18 decks286 decks
-3%synergy
Replenish
6.3%inclusion18 decks286 decks
5%synergy
Buried Alive
5.9%inclusion17 decks286 decks
2%synergy
Maddening Cacophony
5.9%inclusion17 decks286 decks
5%synergy
Farewell
5.6%inclusion16 decks286 decks
-7%synergy
Utility Artifacts
Mesmeric Orb
28%inclusion79 decks286 decks
26%synergy
The One Ring
19%inclusion54 decks286 decks
5%synergy
Wishclaw Talisman
17%inclusion50 decks286 decks
9%synergy
Lightning Greaves
10%inclusion30 decks286 decks
-12%synergy
Cloud Key
6.6%inclusion19 decks286 decks
3%synergy
Wayfarer's Bauble
6.6%inclusion19 decks286 decks
-1%synergy
Altar of Dementia
6.3%inclusion18 decks286 decks
5%synergy
Mindcrank
6.3%inclusion18 decks286 decks
4%synergy
Enchantments
Amphibian Downpour
37%inclusion107 decks286 decks
33%synergy
Cemetery Tampering
34%inclusion98 decks286 decks
34%synergy
Propaganda
34%inclusion97 decks286 decks
7%synergy
Seal of Cleansing
31%inclusion89 decks286 decks
30%synergy
Sphere of Safety
30%inclusion87 decks286 decks
21%synergy
Secret Arcade // Dusty Parlor
30%inclusion87 decks286 decks
25%synergy
Grasp of Fate
30%inclusion85 decks286 decks
24%synergy
Ghostly Prison
28%inclusion80 decks286 decks
6%synergy
Starfield of Nyx
25%inclusion72 decks286 decks
21%synergy
Sigil of the Empty Throne
24%inclusion69 decks286 decks
18%synergy
Touch the Spirit Realm
23%inclusion67 decks286 decks
21%synergy
Out of the Tombs
23%inclusion66 decks286 decks
23%synergy
Estrid's Invocation
23%inclusion65 decks286 decks
18%synergy
The Meathook Massacre
22%inclusion64 decks286 decks
19%synergy
Cacophony Unleashed
22%inclusion64 decks286 decks
21%synergy
Necropotence
22%inclusion62 decks286 decks
15%synergy
Court of Cunning
21%inclusion60 decks286 decks
20%synergy
Static Prison
21%inclusion59 decks286 decks
20%synergy
Tinybones Joins Up
20%inclusion58 decks286 decks
19%synergy
Defiled Crypt // Cadaver Lab
20%inclusion57 decks284 decks
19%synergy
Stillness in Motion
20%inclusion29 decks145 decks
20%synergy
Polluted Cistern // Dim Oubliette
20%inclusion56 decks285 decks
19%synergy
Seal of Removal
20%inclusion56 decks286 decks
19%synergy
Monologue Tax
19%inclusion55 decks286 decks
13%synergy
The Tale of Tamiyo
18%inclusion52 decks286 decks
18%synergy
Greater Auramancy
17%inclusion49 decks286 decks
13%synergy
Black Market Connections
17%inclusion48 decks286 decks
3%synergy
Darksteel Mutation
16%inclusion47 decks286 decks
10%synergy
Copy Enchantment
15%inclusion43 decks286 decks
10%synergy
Shark Typhoon
15%inclusion43 decks286 decks
9%synergy
Phyrexian Arena
14%inclusion41 decks286 decks
0%synergy
All That Glitters
14%inclusion39 decks286 decks
5%synergy
Hallowed Haunting
13%inclusion38 decks286 decks
11%synergy
Chthonian Nightmare
13%inclusion37 decks286 decks
12%synergy
Founding the Third Path
13%inclusion36 decks286 decks
12%synergy
Secrets of the Dead
13%inclusion36 decks286 decks
12%synergy
Ethereal Armor
13%inclusion36 decks286 decks
8%synergy
Teval's Judgment
12%inclusion17 decks147 decks
11%synergy
Leyline of Anticipation
11%inclusion32 decks286 decks
7%synergy
Nowhere to Run
11%inclusion31 decks286 decks
10%synergy
Extravagant Replication
10%inclusion30 decks286 decks
5%synergy
Sheltered by Ghosts
10%inclusion30 decks286 decks
8%synergy
Imprisoned in the Moon
10%inclusion30 decks286 decks
4%synergy
Restricted Office // Lecture Hall
10%inclusion30 decks286 decks
8%synergy
Timely Ward
10%inclusion30 decks286 decks
6%synergy
Authority of the Consuls
10%inclusion29 decks286 decks
-2%synergy
Aura of Silence
10%inclusion28 decks286 decks
7%synergy
Copy Artifact
10%inclusion28 decks286 decks
9%synergy
Land Tax
9.1%inclusion26 decks286 decks
3%synergy
Fraying Sanity
8.7%inclusion25 decks286 decks
8%synergy
Battles
Invasion of Theros
6.6%inclusion19 decks286 decks
5%synergy
Planeswalkers
Teferi, Time Raveler
16%inclusion46 decks286 decks
8%synergy
Jace, Wielder of Mysteries
8.7%inclusion25 decks286 decks
7%synergy
Utility Lands
Hall of Heliod's Generosity
45%inclusion129 decks286 decks
32%synergy
Otawara, Soaring City
37%inclusion106 decks286 decks
18%synergy
Bojuka Bog
33%inclusion93 decks286 decks
5%synergy
Takenuma, Abandoned Mire
21%inclusion59 decks286 decks
14%synergy
Cephalid Coliseum
16%inclusion46 decks286 decks
12%synergy
Urza's Saga
16%inclusion45 decks286 decks
4%synergy
Reliquary Tower
13%inclusion37 decks286 decks
-21%synergy
Emergence Zone
11%inclusion32 decks286 decks
9%synergy
Urborg, Tomb of Yawgmoth
11%inclusion32 decks286 decks
-2%synergy
Nephalia Drownyard
10%inclusion30 decks286 decks
10%synergy
Serra's Sanctum
9.1%inclusion26 decks286 decks
7%synergy
Halimar Depths
7.3%inclusion21 decks286 decks
3%synergy
Minamo, School at Water's Edge
6.6%inclusion19 decks286 decks
3%synergy
Ishgard, the Holy See
5.8%inclusion7 decks120 decks
2%synergy
Rogue's Passage
5.6%inclusion16 decks286 decks
-4%synergy
Mana Artifacts
Arcane Signet
92%inclusion262 decks286 decks
4%synergy
Sol Ring
91%inclusion261 decks286 decks
1%synergy
Talisman of Dominance
60%inclusion173 decks286 decks
11%synergy
Talisman of Progress
52%inclusion148 decks286 decks
8%synergy
Talisman of Hierarchy
49%inclusion140 decks286 decks
5%synergy
Fellwar Stone
43%inclusion122 decks286 decks
9%synergy
Azorius Signet
27%inclusion77 decks286 decks
-5%synergy
Orzhov Signet
24%inclusion70 decks286 decks
-9%synergy
Lotus Petal
24%inclusion68 decks286 decks
13%synergy
Chrome Mox
23%inclusion65 decks286 decks
13%synergy
Dimir Signet
22%inclusion64 decks286 decks
-10%synergy
Mox Diamond
20%inclusion56 decks286 decks
12%synergy
Mox Opal
19%inclusion55 decks286 decks
10%synergy
Lion's Eye Diamond
16%inclusion47 decks286 decks
14%synergy
Mox Amber
10%inclusion29 decks286 decks
4%synergy
Mind Stone
9.4%inclusion27 decks286 decks
-3%synergy
Commander's Sphere
8.4%inclusion24 decks286 decks
-10%synergy
Grim Monolith
7.7%inclusion22 decks286 decks
4%synergy
Thought Vessel
7.3%inclusion21 decks286 decks
-17%synergy
Chromatic Lantern
5.6%inclusion16 decks286 decks
-8%synergy
Lands
Command Tower
97%inclusion276 decks286 decks
4%synergy
Island
85%inclusion244 decks286 decks
-7%synergy
Swamp
83%inclusion238 decks286 decks
-8%synergy
Plains
81%inclusion232 decks286 decks
-10%synergy
Hallowed Fountain
60%inclusion172 decks286 decks
11%synergy
Exotic Orchard
60%inclusion171 decks286 decks
1%synergy
Watery Grave
59%inclusion170 decks286 decks
9%synergy
Godless Shrine
58%inclusion165 decks286 decks
7%synergy
Polluted Delta
56%inclusion160 decks286 decks
18%synergy
Flooded Strand
56%inclusion160 decks286 decks
18%synergy
Marsh Flats
51%inclusion146 decks286 decks
15%synergy
Arcane Sanctum
45%inclusion130 decks286 decks
-9%synergy
Adarkar Wastes
44%inclusion126 decks286 decks
13%synergy
Caves of Koilos
41%inclusion117 decks286 decks
5%synergy
Undercity Sewers
40%inclusion115 decks286 decks
26%synergy
Morphic Pool
40%inclusion115 decks286 decks
6%synergy
Sea of Clouds
40%inclusion115 decks286 decks
5%synergy
Underground River
39%inclusion112 decks286 decks
6%synergy
Vault of Champions
39%inclusion111 decks286 decks
6%synergy
Raffine's Tower
38%inclusion110 decks286 decks
-3%synergy
Meticulous Archive
33%inclusion95 decks286 decks
20%synergy
Shadowy Backstreet
33%inclusion93 decks286 decks
20%synergy
Isolated Chapel
32%inclusion92 decks286 decks
-7%synergy
Glacial Fortress
29%inclusion84 decks286 decks
-11%synergy
Valgavoth's Lair
29%inclusion84 decks286 decks
27%synergy
Drowned Catacomb
29%inclusion82 decks286 decks
-7%synergy
City of Brass
28%inclusion79 decks286 decks
13%synergy
Mana Confluence
27%inclusion77 decks286 decks
13%synergy
Scrubland
26%inclusion74 decks286 decks
10%synergy
Underground Sea
26%inclusion73 decks286 decks
10%synergy
Tundra
26%inclusion73 decks286 decks
10%synergy
Bloodstained Mire
25%inclusion71 decks286 decks
14%synergy
Verdant Catacombs
23%inclusion67 decks286 decks
13%synergy
Scalding Tarn
23%inclusion67 decks286 decks
12%synergy
Evolving Wilds
23%inclusion67 decks286 decks
-2%synergy
Windswept Heath
23%inclusion65 decks286 decks
13%synergy
Misty Rainforest
23%inclusion65 decks286 decks
12%synergy
Gemstone Caverns
23%inclusion65 decks286 decks
15%synergy
Prairie Stream
22%inclusion63 decks286 decks
-19%synergy
Sunken Hollow
22%inclusion62 decks286 decks
-18%synergy
Temple of Deceit
21%inclusion60 decks286 decks
3%synergy
Temple of Silence
20%inclusion58 decks286 decks
1%synergy
Terramorphic Expanse
20%inclusion58 decks286 decks
4%synergy
Temple of Enlightenment
20%inclusion57 decks286 decks
3%synergy
Contaminated Landscape
20%inclusion56 decks286 decks
5%synergy
Arid Mesa
20%inclusion56 decks286 decks
10%synergy
Gloomlake Verge
19%inclusion54 decks286 decks
8%synergy
Shipwreck Marsh
18%inclusion52 decks286 decks
-2%synergy
Azorius Chancery
18%inclusion51 decks286 decks
4%synergy
Deserted Beach
18%inclusion51 decks286 decks
-3%synergy
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