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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Eiganjo Dynastorian
13%inclusion1 decks8 decks
12%synergy
Turbulent Moor
13%inclusion1 decks8 decks
12%synergy
Changing Loyalty
13%inclusion1 decks8 decks
12%synergy
Does Machines
4.8%inclusion3 decks62 decks
5%synergy
Retro-Mutation
2.1%inclusion1 decks47 decks
2%synergy
High Synergy Cards
Ripples of Undeath
63%inclusion200 decks315 decks
61%synergy
Animate Dead
69%inclusion218 decks315 decks
60%synergy
Necromancy
59%inclusion186 decks315 decks
55%synergy
Dress Down
55%inclusion173 decks315 decks
53%synergy
Inquisitive Glimmer
60%inclusion188 decks315 decks
52%synergy
Entity Tracker
50%inclusion156 decks315 decks
43%synergy
Mesa Enchantress
51%inclusion162 decks315 decks
43%synergy
Scrabbling Skullcrab
43%inclusion137 decks315 decks
43%synergy
Gravebreaker Lamia
42%inclusion133 decks315 decks
41%synergy
Dance of the Dead
42%inclusion133 decks315 decks
40%synergy
Top Cards
Mystic Remora
59%inclusion186 decks315 decks
38%synergy
Swords to Plowshares
57%inclusion180 decks315 decks
-11%synergy
Sevinne's Reclamation
48%inclusion152 decks315 decks
39%synergy
Starfield Mystic
44%inclusion139 decks315 decks
38%synergy
Entomb
42%inclusion132 decks315 decks
35%synergy
Overlord of the Balemurk
41%inclusion130 decks315 decks
39%synergy
Demon of Fate's Design
41%inclusion129 decks315 decks
36%synergy
Dark Ritual
41%inclusion128 decks315 decks
21%synergy
Doomwake Giant
39%inclusion123 decks315 decks
33%synergy
Blind Obedience
37%inclusion118 decks315 decks
26%synergy
Game Changers
Smothering Tithe
49%inclusion155 decks315 decks
18%synergy
Rhystic Study
44%inclusion139 decks315 decks
13%synergy
Enlightened Tutor
39%inclusion122 decks315 decks
20%synergy
Demonic Tutor
32%inclusion100 decks315 decks
11%synergy
Thassa's Oracle
29%inclusion92 decks315 decks
20%synergy
Vampiric Tutor
27%inclusion84 decks315 decks
10%synergy
Ancient Tomb
26%inclusion83 decks315 decks
14%synergy
Force of Will
24%inclusion77 decks315 decks
12%synergy
Mana Vault
24%inclusion75 decks315 decks
15%synergy
Chrome Mox
23%inclusion71 decks315 decks
13%synergy
Creatures
Overlord of the Floodpits
36%inclusion113 decks315 decks
32%synergy
Fear of Sleep Paralysis
36%inclusion112 decks315 decks
30%synergy
Victor, Valgavoth's Seneschal
33%inclusion103 decks315 decks
31%synergy
Fear of Impostors
32%inclusion102 decks315 decks
31%synergy
Esper Sentinel
32%inclusion100 decks315 decks
5%synergy
Abdel Adrian, Gorion's Ward
31%inclusion98 decks315 decks
29%synergy
Ondu Spiritdancer
30%inclusion95 decks315 decks
24%synergy
Lotho, Corrupt Shirriff
27%inclusion85 decks315 decks
10%synergy
Grand Abolisher
26%inclusion81 decks315 decks
11%synergy
Zur, Eternal Schemer
25%inclusion80 decks315 decks
22%synergy
Ghostly Dancers
23%inclusion74 decks315 decks
21%synergy
Heliod, the Radiant Dawn
22%inclusion69 decks315 decks
18%synergy
Valley Floodcaller
22%inclusion68 decks315 decks
18%synergy
Silent Hallcreeper
22%inclusion68 decks315 decks
17%synergy
Orcish Bowmasters
22%inclusion68 decks315 decks
11%synergy
Grim Guardian
21%inclusion67 decks315 decks
19%synergy
Enduring Curiosity
21%inclusion66 decks315 decks
13%synergy
Zur the Enchanter
21%inclusion66 decks315 decks
16%synergy
Mindwrack Harpy
20%inclusion62 decks315 decks
19%synergy
Hedron Crab
19%inclusion61 decks315 decks
19%synergy
Hullbreaker Horror
19%inclusion59 decks315 decks
13%synergy
Wan Shi Tong, Librarian
19%inclusion17 decks91 decks
14%synergy
Ranger-Captain of Eos
18%inclusion58 decks315 decks
12%synergy
Displacer Kitten
17%inclusion52 decks315 decks
10%synergy
Sage of Mysteries
16%inclusion51 decks315 decks
16%synergy
Alseid of Life's Bounty
16%inclusion49 decks315 decks
14%synergy
Ledger Shredder
15%inclusion48 decks315 decks
7%synergy
Moon-Blessed Cleric
15%inclusion46 decks315 decks
10%synergy
Skullsnap Nuisance
14%inclusion45 decks315 decks
14%synergy
Soaring Lightbringer
14%inclusion44 decks315 decks
9%synergy
Archon of Sun's Grace
14%inclusion44 decks315 decks
9%synergy
Aminatou, Veil Piercer
14%inclusion43 decks315 decks
12%synergy
Lurrus of the Dream-Den
13%inclusion42 decks315 decks
12%synergy
Voice of Victory
13%inclusion23 decks176 decks
5%synergy
Overlord of the Mistmoors
13%inclusion40 decks315 decks
11%synergy
Mockingbird
12%inclusion37 decks315 decks
7%synergy
Opposition Agent
11%inclusion36 decks315 decks
3%synergy
Balemurk Leech
11%inclusion36 decks315 decks
11%synergy
Drannith Magistrate
10%inclusion33 decks315 decks
3%synergy
Laboratory Maniac
10%inclusion32 decks315 decks
7%synergy
The Mindskinner
10%inclusion31 decks315 decks
9%synergy
Spirited Companion
10%inclusion31 decks315 decks
8%synergy
Nashi, Searcher in the Dark
10%inclusion30 decks315 decks
9%synergy
Ancient Cellarspawn
10%inclusion30 decks315 decks
7%synergy
Millikin
10%inclusion30 decks315 decks
9%synergy
Tataru Taru
9.3%inclusion14 decks150 decks
1%synergy
Archivist of Oghma
9.2%inclusion29 decks315 decks
3%synergy
Stitcher's Supplier
9.2%inclusion29 decks315 decks
8%synergy
Gremlin Tamer
8.9%inclusion28 decks315 decks
8%synergy
Athreos, Shroud-Veiled
8.3%inclusion26 decks315 decks
4%synergy
Instants
An Offer You Can't Refuse
33%inclusion105 decks315 decks
6%synergy
Counterspell
33%inclusion103 decks315 decks
-9%synergy
Swan Song
29%inclusion91 decks315 decks
9%synergy
Path to Exile
27%inclusion84 decks315 decks
-16%synergy
Silence
24%inclusion76 decks315 decks
14%synergy
Arcane Denial
24%inclusion76 decks315 decks
4%synergy
Fierce Guardianship
22%inclusion70 decks315 decks
2%synergy
Force of Negation
21%inclusion66 decks315 decks
9%synergy
Demonic Consultation
21%inclusion66 decks315 decks
13%synergy
Flusterstorm
20%inclusion64 decks315 decks
12%synergy
Tainted Pact
20%inclusion62 decks315 decks
13%synergy
Intuition
20%inclusion62 decks315 decks
18%synergy
Mental Misstep
19%inclusion61 decks315 decks
13%synergy
Borne Upon a Wind
19%inclusion59 decks315 decks
14%synergy
Cyclonic Rift
19%inclusion59 decks315 decks
-5%synergy
Dovin's Veto
18%inclusion57 decks315 decks
-8%synergy
Cabal Ritual
18%inclusion57 decks315 decks
15%synergy
Void Rend
18%inclusion57 decks315 decks
-16%synergy
Pact of Negation
18%inclusion57 decks315 decks
11%synergy
Mindbreak Trap
18%inclusion56 decks315 decks
11%synergy
Mystical Tutor
18%inclusion56 decks315 decks
7%synergy
Frantic Search
16%inclusion51 decks315 decks
-2%synergy
Sink into Stupor
16%inclusion51 decks315 decks
3%synergy
Otherworldly Gaze
14%inclusion45 decks315 decks
12%synergy
Mana Drain
14%inclusion44 decks315 decks
-3%synergy
Thirst for Meaning
13%inclusion42 decks315 decks
12%synergy
Gifts Ungiven
12%inclusion37 decks315 decks
9%synergy
Into the Flood Maw
11%inclusion36 decks315 decks
8%synergy
Negate
11%inclusion34 decks315 decks
-6%synergy
Fell the Profane
8.6%inclusion27 decks315 decks
0%synergy
Brainstorm
8.6%inclusion27 decks315 decks
-8%synergy
Anguished Unmaking
8.6%inclusion27 decks315 decks
-17%synergy
Chain of Vapor
8.3%inclusion26 decks315 decks
5%synergy
Brain Freeze
7.0%inclusion22 decks315 decks
6%synergy
Faithful Mending
7.0%inclusion22 decks315 decks
3%synergy
Strix Serenade
7.0%inclusion22 decks315 decks
3%synergy
Retraction Helix
6.7%inclusion21 decks315 decks
6%synergy
Thought Scour
6.7%inclusion21 decks315 decks
6%synergy
Inkshield
6.3%inclusion20 decks315 decks
-3%synergy
Teferi's Protection
5.4%inclusion17 decks315 decks
-11%synergy
Drown in the Loch
5.4%inclusion17 decks315 decks
3%synergy
Generous Gift
5.4%inclusion17 decks315 decks
-9%synergy
Sorceries
Reanimate
28%inclusion89 decks315 decks
12%synergy
Windfall
27%inclusion85 decks315 decks
14%synergy
Redress Fate
24%inclusion75 decks315 decks
18%synergy
Singularity Rupture
19%inclusion25 decks130 decks
17%synergy
Imperial Seal
18%inclusion58 decks315 decks
11%synergy
Toxic Deluge
18%inclusion57 decks315 decks
-1%synergy
Dance of the Manse
16%inclusion50 decks315 decks
13%synergy
Glimpse the Unthinkable
15%inclusion46 decks315 decks
14%synergy
Space-Time Anomaly
14%inclusion18 decks127 decks
13%synergy
Damn
12%inclusion39 decks315 decks
-8%synergy
Extinguish All Hope
12%inclusion38 decks315 decks
10%synergy
Lively Dirge
11%inclusion35 decks315 decks
10%synergy
Demonic Counsel
11%inclusion35 decks315 decks
10%synergy
Resurgent Belief
8.9%inclusion28 decks315 decks
7%synergy
Beseech the Mirror
8.3%inclusion26 decks315 decks
4%synergy
Breach the Multiverse
7.9%inclusion25 decks315 decks
6%synergy
Traumatize
7.6%inclusion24 decks315 decks
7%synergy
Unmarked Grave
7.0%inclusion22 decks315 decks
6%synergy
Supreme Verdict
6.7%inclusion21 decks315 decks
-8%synergy
Buried Alive
6.7%inclusion21 decks315 decks
3%synergy
Replenish
6.3%inclusion20 decks315 decks
5%synergy
Idyllic Tutor
6.3%inclusion20 decks315 decks
2%synergy
Wrath of God
6.0%inclusion19 decks315 decks
2%synergy
Time Wipe
6.0%inclusion19 decks315 decks
-1%synergy
Maddening Cacophony
6.0%inclusion19 decks315 decks
5%synergy
Cut Your Losses
5.7%inclusion18 decks315 decks
5%synergy
Ponder
5.4%inclusion17 decks315 decks
-4%synergy
Farewell
5.4%inclusion17 decks315 decks
-7%synergy
Utility Artifacts
Mesmeric Orb
27%inclusion86 decks315 decks
26%synergy
The One Ring
17%inclusion55 decks315 decks
5%synergy
Wishclaw Talisman
16%inclusion51 decks315 decks
8%synergy
Lightning Greaves
10%inclusion31 decks315 decks
-13%synergy
Wayfarer's Bauble
6.7%inclusion21 decks315 decks
-1%synergy
Cloud Key
6.7%inclusion21 decks315 decks
3%synergy
Mindcrank
6.0%inclusion19 decks315 decks
4%synergy
Altar of Dementia
6.0%inclusion19 decks315 decks
5%synergy
Perpetual Timepiece
5.1%inclusion16 decks315 decks
5%synergy
Altar of the Brood
5.1%inclusion16 decks315 decks
4%synergy
Enchantments
Mirrormade
37%inclusion117 decks315 decks
27%synergy
Amphibian Downpour
37%inclusion116 decks315 decks
32%synergy
Cemetery Tampering
35%inclusion109 decks315 decks
34%synergy
Propaganda
34%inclusion106 decks315 decks
6%synergy
Seal of Cleansing
32%inclusion100 decks315 decks
30%synergy
Sphere of Safety
31%inclusion98 decks315 decks
22%synergy
Grasp of Fate
31%inclusion97 decks315 decks
25%synergy
Secret Arcade // Dusty Parlor
31%inclusion97 decks315 decks
26%synergy
Ghostly Prison
27%inclusion86 decks315 decks
5%synergy
Starfield of Nyx
24%inclusion76 decks315 decks
20%synergy
Sigil of the Empty Throne
24%inclusion75 decks315 decks
18%synergy
The Meathook Massacre
23%inclusion71 decks315 decks
19%synergy
Out of the Tombs
23%inclusion71 decks315 decks
22%synergy
Touch the Spirit Realm
23%inclusion71 decks315 decks
20%synergy
Estrid's Invocation
23%inclusion71 decks315 decks
18%synergy
Cacophony Unleashed
22%inclusion68 decks315 decks
20%synergy
Necropotence
21%inclusion66 decks315 decks
14%synergy
Stillness in Motion
21%inclusion36 decks174 decks
20%synergy
Court of Cunning
21%inclusion65 decks315 decks
20%synergy
The Tale of Tamiyo
21%inclusion65 decks315 decks
20%synergy
Polluted Cistern // Dim Oubliette
20%inclusion64 decks314 decks
20%synergy
Defiled Crypt // Cadaver Lab
20%inclusion63 decks313 decks
19%synergy
Seal of Removal
20%inclusion62 decks315 decks
19%synergy
Static Prison
19%inclusion61 decks315 decks
19%synergy
Tinybones Joins Up
19%inclusion59 decks315 decks
18%synergy
Monologue Tax
18%inclusion58 decks315 decks
12%synergy
Darksteel Mutation
16%inclusion51 decks315 decks
10%synergy
Copy Enchantment
16%inclusion51 decks315 decks
11%synergy
Greater Auramancy
16%inclusion51 decks315 decks
12%synergy
Black Market Connections
15%inclusion47 decks315 decks
0%synergy
Hallowed Haunting
14%inclusion45 decks315 decks
12%synergy
All That Glitters
14%inclusion44 decks315 decks
5%synergy
Ethereal Armor
14%inclusion43 decks315 decks
9%synergy
Shark Typhoon
13%inclusion42 decks315 decks
8%synergy
Phyrexian Arena
13%inclusion42 decks315 decks
-1%synergy
Sheltered by Ghosts
13%inclusion41 decks315 decks
10%synergy
Secrets of the Dead
12%inclusion39 decks315 decks
12%synergy
Founding the Third Path
12%inclusion38 decks315 decks
12%synergy
Imprisoned in the Moon
12%inclusion38 decks315 decks
5%synergy
Leyline of Anticipation
12%inclusion38 decks315 decks
8%synergy
Chthonian Nightmare
12%inclusion37 decks315 decks
11%synergy
Nowhere to Run
11%inclusion35 decks315 decks
10%synergy
Teval's Judgment
11%inclusion19 decks176 decks
10%synergy
Restricted Office // Lecture Hall
11%inclusion34 decks315 decks
9%synergy
Timely Ward
10%inclusion33 decks315 decks
5%synergy
Extravagant Replication
10%inclusion31 decks315 decks
5%synergy
Aura of Silence
10%inclusion31 decks315 decks
7%synergy
Central Elevator // Promising Stairs
10%inclusion30 decks315 decks
9%synergy
Authority of the Consuls
9.2%inclusion29 decks315 decks
-3%synergy
Oubliette
9.2%inclusion29 decks315 decks
8%synergy
Battles
Invasion of Theros
6.0%inclusion19 decks315 decks
4%synergy
Planeswalkers
Teferi, Time Raveler
14%inclusion44 decks315 decks
6%synergy
Jace, Wielder of Mysteries
8.6%inclusion27 decks315 decks
7%synergy
Jace, the Perfected Mind
5.1%inclusion16 decks315 decks
5%synergy
Utility Lands
Hall of Heliod's Generosity
45%inclusion143 decks315 decks
32%synergy
Otawara, Soaring City
37%inclusion116 decks315 decks
18%synergy
Bojuka Bog
33%inclusion103 decks315 decks
6%synergy
Takenuma, Abandoned Mire
20%inclusion63 decks315 decks
14%synergy
Cephalid Coliseum
16%inclusion51 decks315 decks
13%synergy
Urza's Saga
16%inclusion50 decks315 decks
4%synergy
Reliquary Tower
13%inclusion42 decks315 decks
-21%synergy
Urborg, Tomb of Yawgmoth
11%inclusion35 decks315 decks
-2%synergy
Serra's Sanctum
10%inclusion32 decks315 decks
8%synergy
Emergence Zone
10%inclusion32 decks315 decks
8%synergy
Nephalia Drownyard
10%inclusion30 decks315 decks
9%synergy
Halimar Depths
7.0%inclusion22 decks315 decks
2%synergy
Minamo, School at Water's Edge
6.0%inclusion19 decks315 decks
2%synergy
Rogue's Passage
6.0%inclusion19 decks315 decks
-4%synergy
Ishgard, the Holy See
5.3%inclusion8 decks150 decks
2%synergy
Mana Artifacts
Arcane Signet
90%inclusion283 decks315 decks
2%synergy
Sol Ring
88%inclusion278 decks315 decks
-2%synergy
Talisman of Dominance
58%inclusion183 decks315 decks
8%synergy
Talisman of Progress
50%inclusion159 decks315 decks
7%synergy
Talisman of Hierarchy
47%inclusion149 decks315 decks
3%synergy
Fellwar Stone
42%inclusion133 decks315 decks
9%synergy
Azorius Signet
27%inclusion85 decks315 decks
-4%synergy
Orzhov Signet
24%inclusion77 decks315 decks
-8%synergy
Lotus Petal
23%inclusion73 decks315 decks
13%synergy
Dimir Signet
22%inclusion69 decks315 decks
-9%synergy
Mox Diamond
19%inclusion60 decks315 decks
12%synergy
Mox Opal
18%inclusion58 decks315 decks
10%synergy
Lion's Eye Diamond
17%inclusion52 decks315 decks
14%synergy
Mox Amber
10%inclusion31 decks315 decks
4%synergy
Mind Stone
8.6%inclusion27 decks315 decks
-4%synergy
Grim Monolith
7.9%inclusion25 decks315 decks
5%synergy
Commander's Sphere
7.3%inclusion23 decks315 decks
-11%synergy
Thought Vessel
6.7%inclusion21 decks315 decks
-18%synergy
Chromatic Lantern
5.1%inclusion16 decks315 decks
-8%synergy
Lands
Command Tower
97%inclusion304 decks315 decks
4%synergy
Island
85%inclusion268 decks315 decks
-8%synergy
Swamp
83%inclusion261 decks315 decks
-9%synergy
Plains
81%inclusion255 decks315 decks
-11%synergy
Watery Grave
62%inclusion194 decks315 decks
11%synergy
Hallowed Fountain
61%inclusion192 decks315 decks
11%synergy
Exotic Orchard
60%inclusion189 decks315 decks
1%synergy
Godless Shrine
59%inclusion186 decks315 decks
8%synergy
Polluted Delta
56%inclusion176 decks315 decks
18%synergy
Flooded Strand
56%inclusion176 decks315 decks
18%synergy
Marsh Flats
51%inclusion161 decks315 decks
15%synergy
Arcane Sanctum
45%inclusion143 decks315 decks
-9%synergy
Adarkar Wastes
43%inclusion137 decks315 decks
12%synergy
Undercity Sewers
41%inclusion129 decks315 decks
26%synergy
Caves of Koilos
40%inclusion127 decks315 decks
5%synergy
Morphic Pool
40%inclusion126 decks315 decks
6%synergy
Raffine's Tower
40%inclusion125 decks315 decks
-1%synergy
Underground River
39%inclusion123 decks315 decks
5%synergy
Vault of Champions
39%inclusion123 decks315 decks
7%synergy
Sea of Clouds
39%inclusion122 decks315 decks
4%synergy
Meticulous Archive
34%inclusion108 decks315 decks
20%synergy
Shadowy Backstreet
33%inclusion103 decks315 decks
20%synergy
Isolated Chapel
32%inclusion101 decks315 decks
-9%synergy
Valgavoth's Lair
30%inclusion95 decks315 decks
27%synergy
Glacial Fortress
29%inclusion92 decks315 decks
-13%synergy
Drowned Catacomb
28%inclusion89 decks315 decks
-9%synergy
City of Brass
28%inclusion87 decks315 decks
13%synergy
Mana Confluence
27%inclusion85 decks315 decks
13%synergy
Scrubland
26%inclusion83 decks315 decks
10%synergy
Tundra
26%inclusion82 decks315 decks
10%synergy
Underground Sea
26%inclusion82 decks315 decks
10%synergy
Bloodstained Mire
24%inclusion76 decks315 decks
13%synergy
Scalding Tarn
23%inclusion72 decks315 decks
12%synergy
Misty Rainforest
23%inclusion71 decks315 decks
12%synergy
Verdant Catacombs
23%inclusion71 decks315 decks
13%synergy
Evolving Wilds
23%inclusion71 decks315 decks
-2%synergy
Gemstone Caverns
22%inclusion69 decks315 decks
14%synergy
Windswept Heath
22%inclusion68 decks315 decks
12%synergy
Prairie Stream
21%inclusion67 decks315 decks
-19%synergy
Sunken Hollow
20%inclusion64 decks315 decks
-19%synergy
Temple of Silence
20%inclusion63 decks315 decks
1%synergy
Terramorphic Expanse
20%inclusion62 decks315 decks
4%synergy
Contaminated Landscape
19%inclusion61 decks315 decks
5%synergy
Temple of Deceit
19%inclusion61 decks315 decks
2%synergy
Arid Mesa
19%inclusion61 decks315 decks
10%synergy
Deserted Beach
19%inclusion61 decks315 decks
-1%synergy
Shipwreck Marsh
19%inclusion59 decks315 decks
-2%synergy
Temple of Enlightenment
19%inclusion59 decks315 decks
3%synergy
Gloomlake Verge
18%inclusion58 decks315 decks
7%synergy
Floodfarm Verge
18%inclusion57 decks315 decks
7%synergy
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