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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Mornsong Aria
8.8%inclusion5 decks57 decks
8%synergy
Twilight Diviner
5.5%inclusion3 decks55 decks
4%synergy
Does Machines
4.0%inclusion2 decks50 decks
4%synergy
Retro-Mutation
3.2%inclusion1 decks31 decks
3%synergy
Dimensional Exile
2.9%inclusion1 decks34 decks
3%synergy
High Synergy Cards
Ripples of Undeath
64%inclusion195 decks304 decks
61%synergy
Animate Dead
70%inclusion212 decks304 decks
60%synergy
Necromancy
60%inclusion182 decks304 decks
55%synergy
Dress Down
55%inclusion168 decks304 decks
53%synergy
Inquisitive Glimmer
59%inclusion179 decks304 decks
52%synergy
Entity Tracker
49%inclusion150 decks304 decks
43%synergy
Scrabbling Skullcrab
43%inclusion131 decks304 decks
42%synergy
Mesa Enchantress
51%inclusion154 decks304 decks
42%synergy
Dance of the Dead
42%inclusion129 decks304 decks
40%synergy
Gravebreaker Lamia
41%inclusion125 decks304 decks
40%synergy
Top Cards
Mystic Remora
60%inclusion182 decks304 decks
39%synergy
Swords to Plowshares
58%inclusion176 decks304 decks
-10%synergy
Sevinne's Reclamation
48%inclusion147 decks304 decks
39%synergy
Starfield Mystic
43%inclusion132 decks304 decks
37%synergy
Entomb
41%inclusion126 decks304 decks
35%synergy
Overlord of the Balemurk
41%inclusion126 decks304 decks
40%synergy
Dark Ritual
40%inclusion123 decks304 decks
21%synergy
Demon of Fate's Design
39%inclusion120 decks304 decks
34%synergy
Blind Obedience
38%inclusion116 decks304 decks
26%synergy
Doomwake Giant
37%inclusion113 decks304 decks
31%synergy
Game Changers
Smothering Tithe
50%inclusion153 decks304 decks
19%synergy
Rhystic Study
45%inclusion138 decks304 decks
14%synergy
Enlightened Tutor
39%inclusion120 decks304 decks
20%synergy
Demonic Tutor
32%inclusion98 decks304 decks
11%synergy
Thassa's Oracle
30%inclusion92 decks304 decks
21%synergy
Vampiric Tutor
28%inclusion84 decks304 decks
11%synergy
Ancient Tomb
27%inclusion81 decks304 decks
14%synergy
Force of Will
25%inclusion76 decks304 decks
13%synergy
Mana Vault
24%inclusion74 decks304 decks
15%synergy
Chrome Mox
23%inclusion71 decks304 decks
14%synergy
Creatures
Overlord of the Floodpits
36%inclusion109 decks304 decks
32%synergy
Fear of Sleep Paralysis
35%inclusion107 decks304 decks
30%synergy
Victor, Valgavoth's Seneschal
33%inclusion100 decks304 decks
31%synergy
Esper Sentinel
32%inclusion98 decks304 decks
5%synergy
Abdel Adrian, Gorion's Ward
32%inclusion97 decks304 decks
30%synergy
Fear of Impostors
32%inclusion96 decks304 decks
30%synergy
Ondu Spiritdancer
30%inclusion91 decks304 decks
24%synergy
Lotho, Corrupt Shirriff
28%inclusion85 decks304 decks
11%synergy
Grand Abolisher
26%inclusion80 decks304 decks
12%synergy
Zur, Eternal Schemer
25%inclusion76 decks304 decks
22%synergy
Ghostly Dancers
23%inclusion70 decks304 decks
20%synergy
Valley Floodcaller
23%inclusion69 decks304 decks
19%synergy
Orcish Bowmasters
22%inclusion68 decks304 decks
12%synergy
Heliod, the Radiant Dawn
22%inclusion66 decks304 decks
18%synergy
Grim Guardian
21%inclusion65 decks304 decks
19%synergy
Zur the Enchanter
21%inclusion65 decks304 decks
16%synergy
Silent Hallcreeper
21%inclusion64 decks304 decks
17%synergy
Enduring Curiosity
20%inclusion61 decks304 decks
12%synergy
Wan Shi Tong, Librarian
20%inclusion16 decks80 decks
15%synergy
Mindwrack Harpy
20%inclusion60 decks304 decks
19%synergy
Hullbreaker Horror
20%inclusion60 decks304 decks
14%synergy
Hedron Crab
19%inclusion59 decks304 decks
19%synergy
Ranger-Captain of Eos
19%inclusion57 decks304 decks
12%synergy
Displacer Kitten
18%inclusion54 decks304 decks
11%synergy
Ledger Shredder
16%inclusion49 decks304 decks
7%synergy
Sage of Mysteries
16%inclusion49 decks304 decks
16%synergy
Alseid of Life's Bounty
15%inclusion46 decks304 decks
14%synergy
Moon-Blessed Cleric
15%inclusion45 decks304 decks
10%synergy
Skullsnap Nuisance
15%inclusion45 decks304 decks
14%synergy
Archon of Sun's Grace
14%inclusion44 decks304 decks
10%synergy
Lurrus of the Dream-Den
14%inclusion43 decks304 decks
13%synergy
Soaring Lightbringer
13%inclusion41 decks304 decks
9%synergy
Aminatou, Veil Piercer
13%inclusion41 decks304 decks
12%synergy
Voice of Victory
13%inclusion22 decks165 decks
5%synergy
Overlord of the Mistmoors
13%inclusion39 decks304 decks
11%synergy
Balemurk Leech
12%inclusion37 decks304 decks
12%synergy
Mockingbird
12%inclusion37 decks304 decks
8%synergy
Opposition Agent
12%inclusion36 decks304 decks
3%synergy
Laboratory Maniac
11%inclusion33 decks304 decks
8%synergy
Drannith Magistrate
11%inclusion33 decks304 decks
3%synergy
Spirited Companion
10%inclusion31 decks304 decks
8%synergy
Tataru Taru
10%inclusion14 decks139 decks
2%synergy
Nashi, Searcher in the Dark
10%inclusion30 decks304 decks
9%synergy
Archivist of Oghma
10%inclusion29 decks304 decks
3%synergy
Stitcher's Supplier
10%inclusion29 decks304 decks
9%synergy
Gremlin Tamer
10%inclusion29 decks304 decks
9%synergy
The Mindskinner
9.2%inclusion28 decks304 decks
8%synergy
Millikin
9.2%inclusion28 decks304 decks
9%synergy
Ancient Cellarspawn
9.2%inclusion28 decks304 decks
6%synergy
Athreos, Shroud-Veiled
8.6%inclusion26 decks304 decks
4%synergy
Instants
An Offer You Can't Refuse
34%inclusion102 decks304 decks
6%synergy
Counterspell
32%inclusion98 decks304 decks
-9%synergy
Swan Song
29%inclusion89 decks304 decks
10%synergy
Path to Exile
27%inclusion83 decks304 decks
-15%synergy
Silence
25%inclusion76 decks304 decks
15%synergy
Arcane Denial
24%inclusion74 decks304 decks
4%synergy
Fierce Guardianship
23%inclusion69 decks304 decks
2%synergy
Force of Negation
22%inclusion67 decks304 decks
10%synergy
Demonic Consultation
22%inclusion66 decks304 decks
14%synergy
Flusterstorm
21%inclusion63 decks304 decks
13%synergy
Tainted Pact
20%inclusion62 decks304 decks
13%synergy
Intuition
20%inclusion61 decks304 decks
18%synergy
Mental Misstep
20%inclusion60 decks304 decks
13%synergy
Borne Upon a Wind
19%inclusion59 decks304 decks
15%synergy
Cyclonic Rift
19%inclusion58 decks304 decks
-5%synergy
Mindbreak Trap
18%inclusion56 decks304 decks
12%synergy
Cabal Ritual
18%inclusion56 decks304 decks
15%synergy
Pact of Negation
18%inclusion56 decks304 decks
11%synergy
Mystical Tutor
18%inclusion56 decks304 decks
7%synergy
Dovin's Veto
18%inclusion55 decks304 decks
-8%synergy
Void Rend
18%inclusion55 decks304 decks
-16%synergy
Sink into Stupor
17%inclusion51 decks304 decks
4%synergy
Frantic Search
16%inclusion49 decks304 decks
-2%synergy
Otherworldly Gaze
14%inclusion44 decks304 decks
12%synergy
Mana Drain
14%inclusion42 decks304 decks
-4%synergy
Thirst for Meaning
13%inclusion41 decks304 decks
12%synergy
Gifts Ungiven
12%inclusion37 decks304 decks
10%synergy
Into the Flood Maw
12%inclusion36 decks304 decks
8%synergy
Negate
11%inclusion34 decks304 decks
-5%synergy
Fell the Profane
8.9%inclusion27 decks304 decks
0%synergy
Brainstorm
8.9%inclusion27 decks304 decks
-8%synergy
Chain of Vapor
8.6%inclusion26 decks304 decks
5%synergy
Anguished Unmaking
8.2%inclusion25 decks304 decks
-17%synergy
Faithful Mending
7.2%inclusion22 decks304 decks
3%synergy
Retraction Helix
7.2%inclusion22 decks304 decks
7%synergy
Brain Freeze
7.2%inclusion22 decks304 decks
7%synergy
Strix Serenade
6.9%inclusion21 decks304 decks
3%synergy
Thought Scour
6.3%inclusion19 decks304 decks
5%synergy
Inkshield
6.3%inclusion19 decks304 decks
-3%synergy
Generous Gift
5.6%inclusion17 decks304 decks
-9%synergy
Drown in the Loch
5.3%inclusion16 decks304 decks
3%synergy
Sorceries
Reanimate
29%inclusion87 decks304 decks
12%synergy
Windfall
27%inclusion83 decks304 decks
14%synergy
Redress Fate
24%inclusion73 decks304 decks
18%synergy
Imperial Seal
19%inclusion58 decks304 decks
12%synergy
Singularity Rupture
18%inclusion22 decks119 decks
16%synergy
Toxic Deluge
18%inclusion56 decks304 decks
-1%synergy
Dance of the Manse
16%inclusion48 decks304 decks
12%synergy
Glimpse the Unthinkable
14%inclusion42 decks304 decks
13%synergy
Space-Time Anomaly
14%inclusion16 decks116 decks
12%synergy
Damn
13%inclusion38 decks304 decks
-8%synergy
Extinguish All Hope
12%inclusion37 decks304 decks
11%synergy
Lively Dirge
12%inclusion36 decks304 decks
11%synergy
Demonic Counsel
12%inclusion36 decks304 decks
11%synergy
Beseech the Mirror
8.2%inclusion25 decks304 decks
4%synergy
Resurgent Belief
7.9%inclusion24 decks304 decks
6%synergy
Breach the Multiverse
7.9%inclusion24 decks304 decks
6%synergy
Unmarked Grave
7.6%inclusion23 decks304 decks
6%synergy
Traumatize
7.2%inclusion22 decks304 decks
7%synergy
Idyllic Tutor
6.6%inclusion20 decks304 decks
2%synergy
Wrath of God
6.3%inclusion19 decks304 decks
2%synergy
Replenish
6.3%inclusion19 decks304 decks
5%synergy
Supreme Verdict
6.3%inclusion19 decks304 decks
-9%synergy
Cut Your Losses
5.9%inclusion18 decks304 decks
6%synergy
Buried Alive
5.9%inclusion18 decks304 decks
2%synergy
Time Wipe
5.9%inclusion18 decks304 decks
-1%synergy
Maddening Cacophony
5.9%inclusion18 decks304 decks
5%synergy
Ponder
5.6%inclusion17 decks304 decks
-3%synergy
Farewell
5.6%inclusion17 decks304 decks
-7%synergy
Utility Artifacts
Mesmeric Orb
28%inclusion85 decks304 decks
27%synergy
The One Ring
18%inclusion55 decks304 decks
5%synergy
Wishclaw Talisman
17%inclusion51 decks304 decks
9%synergy
Lightning Greaves
10%inclusion30 decks304 decks
-13%synergy
Wayfarer's Bauble
6.9%inclusion21 decks304 decks
-1%synergy
Cloud Key
6.6%inclusion20 decks304 decks
3%synergy
Mindcrank
6.3%inclusion19 decks304 decks
4%synergy
Altar of Dementia
5.9%inclusion18 decks304 decks
5%synergy
Altar of the Brood
5.3%inclusion16 decks304 decks
4%synergy
Enchantments
Mirrormade
37%inclusion113 decks304 decks
27%synergy
Amphibian Downpour
37%inclusion112 decks304 decks
32%synergy
Cemetery Tampering
35%inclusion105 decks304 decks
34%synergy
Propaganda
34%inclusion102 decks304 decks
6%synergy
Sphere of Safety
31%inclusion95 decks304 decks
22%synergy
Seal of Cleansing
31%inclusion94 decks304 decks
29%synergy
Secret Arcade // Dusty Parlor
30%inclusion92 decks304 decks
26%synergy
Grasp of Fate
30%inclusion92 decks304 decks
24%synergy
Ghostly Prison
28%inclusion85 decks304 decks
6%synergy
Starfield of Nyx
25%inclusion75 decks304 decks
21%synergy
Sigil of the Empty Throne
24%inclusion72 decks304 decks
18%synergy
Touch the Spirit Realm
23%inclusion70 decks304 decks
21%synergy
Out of the Tombs
23%inclusion69 decks304 decks
22%synergy
Estrid's Invocation
23%inclusion69 decks304 decks
18%synergy
The Meathook Massacre
22%inclusion68 decks304 decks
19%synergy
Necropotence
22%inclusion66 decks304 decks
15%synergy
Cacophony Unleashed
21%inclusion64 decks304 decks
19%synergy
Court of Cunning
21%inclusion64 decks304 decks
20%synergy
Stillness in Motion
21%inclusion34 decks163 decks
20%synergy
Defiled Crypt // Cadaver Lab
21%inclusion62 decks302 decks
20%synergy
Polluted Cistern // Dim Oubliette
20%inclusion62 decks303 decks
20%synergy
Static Prison
20%inclusion62 decks304 decks
20%synergy
The Tale of Tamiyo
20%inclusion60 decks304 decks
19%synergy
Seal of Removal
19%inclusion59 decks304 decks
19%synergy
Tinybones Joins Up
19%inclusion59 decks304 decks
18%synergy
Monologue Tax
18%inclusion55 decks304 decks
12%synergy
Greater Auramancy
16%inclusion50 decks304 decks
12%synergy
Copy Enchantment
16%inclusion49 decks304 decks
11%synergy
Darksteel Mutation
16%inclusion49 decks304 decks
10%synergy
Black Market Connections
15%inclusion46 decks304 decks
1%synergy
Hallowed Haunting
14%inclusion42 decks304 decks
11%synergy
Phyrexian Arena
14%inclusion42 decks304 decks
0%synergy
Shark Typhoon
13%inclusion41 decks304 decks
8%synergy
All That Glitters
13%inclusion41 decks304 decks
5%synergy
Ethereal Armor
13%inclusion41 decks304 decks
9%synergy
Founding the Third Path
13%inclusion39 decks304 decks
13%synergy
Leyline of Anticipation
13%inclusion38 decks304 decks
8%synergy
Secrets of the Dead
13%inclusion38 decks304 decks
12%synergy
Chthonian Nightmare
12%inclusion36 decks304 decks
11%synergy
Sheltered by Ghosts
12%inclusion36 decks304 decks
9%synergy
Teval's Judgment
12%inclusion19 decks165 decks
11%synergy
Nowhere to Run
12%inclusion35 decks304 decks
10%synergy
Imprisoned in the Moon
11%inclusion34 decks304 decks
5%synergy
Timely Ward
11%inclusion32 decks304 decks
5%synergy
Restricted Office // Lecture Hall
11%inclusion32 decks304 decks
8%synergy
Aura of Silence
10%inclusion30 decks304 decks
7%synergy
Unable to Scream
10%inclusion29 decks304 decks
8%synergy
Copy Artifact
10%inclusion29 decks304 decks
8%synergy
Extravagant Replication
10%inclusion29 decks304 decks
5%synergy
Authority of the Consuls
10%inclusion29 decks304 decks
-3%synergy
Battles
Invasion of Theros
6.3%inclusion19 decks304 decks
4%synergy
Planeswalkers
Teferi, Time Raveler
15%inclusion47 decks304 decks
7%synergy
Jace, Wielder of Mysteries
8.9%inclusion27 decks304 decks
7%synergy
Utility Lands
Hall of Heliod's Generosity
45%inclusion136 decks304 decks
32%synergy
Otawara, Soaring City
37%inclusion112 decks304 decks
18%synergy
Bojuka Bog
33%inclusion101 decks304 decks
6%synergy
Takenuma, Abandoned Mire
20%inclusion62 decks304 decks
14%synergy
Cephalid Coliseum
17%inclusion51 decks304 decks
13%synergy
Urza's Saga
16%inclusion49 decks304 decks
4%synergy
Reliquary Tower
13%inclusion41 decks304 decks
-20%synergy
Urborg, Tomb of Yawgmoth
11%inclusion33 decks304 decks
-2%synergy
Emergence Zone
11%inclusion32 decks304 decks
8%synergy
Serra's Sanctum
10%inclusion31 decks304 decks
8%synergy
Nephalia Drownyard
10%inclusion30 decks304 decks
9%synergy
Halimar Depths
7.2%inclusion22 decks304 decks
3%synergy
Minamo, School at Water's Edge
6.3%inclusion19 decks304 decks
2%synergy
Ishgard, the Holy See
5.8%inclusion8 decks139 decks
2%synergy
Rogue's Passage
5.6%inclusion17 decks304 decks
-4%synergy
Mana Artifacts
Arcane Signet
91%inclusion276 decks304 decks
3%synergy
Sol Ring
89%inclusion270 decks304 decks
-1%synergy
Talisman of Dominance
59%inclusion178 decks304 decks
9%synergy
Talisman of Progress
51%inclusion154 decks304 decks
7%synergy
Talisman of Hierarchy
47%inclusion144 decks304 decks
3%synergy
Fellwar Stone
42%inclusion129 decks304 decks
9%synergy
Azorius Signet
27%inclusion81 decks304 decks
-4%synergy
Orzhov Signet
24%inclusion73 decks304 decks
-9%synergy
Lotus Petal
24%inclusion73 decks304 decks
14%synergy
Dimir Signet
22%inclusion67 decks304 decks
-9%synergy
Mox Diamond
20%inclusion60 decks304 decks
13%synergy
Mox Opal
19%inclusion58 decks304 decks
11%synergy
Lion's Eye Diamond
17%inclusion52 decks304 decks
15%synergy
Mox Amber
10%inclusion31 decks304 decks
4%synergy
Mind Stone
8.6%inclusion26 decks304 decks
-4%synergy
Grim Monolith
8.2%inclusion25 decks304 decks
5%synergy
Commander's Sphere
7.6%inclusion23 decks304 decks
-11%synergy
Thought Vessel
6.9%inclusion21 decks304 decks
-18%synergy
Chromatic Lantern
5.3%inclusion16 decks304 decks
-8%synergy
Lands
Command Tower
97%inclusion294 decks304 decks
4%synergy
Island
85%inclusion258 decks304 decks
-8%synergy
Swamp
83%inclusion251 decks304 decks
-9%synergy
Plains
81%inclusion246 decks304 decks
-11%synergy
Watery Grave
61%inclusion186 decks304 decks
11%synergy
Exotic Orchard
61%inclusion184 decks304 decks
2%synergy
Hallowed Fountain
60%inclusion183 decks304 decks
10%synergy
Godless Shrine
59%inclusion179 decks304 decks
8%synergy
Polluted Delta
56%inclusion171 decks304 decks
19%synergy
Flooded Strand
56%inclusion171 decks304 decks
18%synergy
Marsh Flats
51%inclusion156 decks304 decks
15%synergy
Arcane Sanctum
45%inclusion138 decks304 decks
-9%synergy
Adarkar Wastes
43%inclusion132 decks304 decks
12%synergy
Caves of Koilos
40%inclusion122 decks304 decks
5%synergy
Undercity Sewers
40%inclusion122 decks304 decks
26%synergy
Morphic Pool
40%inclusion121 decks304 decks
6%synergy
Raffine's Tower
39%inclusion119 decks304 decks
-2%synergy
Underground River
39%inclusion118 decks304 decks
5%synergy
Vault of Champions
38%inclusion117 decks304 decks
6%synergy
Sea of Clouds
38%inclusion117 decks304 decks
3%synergy
Meticulous Archive
33%inclusion101 decks304 decks
19%synergy
Shadowy Backstreet
32%inclusion98 decks304 decks
20%synergy
Isolated Chapel
32%inclusion97 decks304 decks
-8%synergy
Valgavoth's Lair
29%inclusion89 decks304 decks
27%synergy
Glacial Fortress
29%inclusion88 decks304 decks
-13%synergy
Drowned Catacomb
29%inclusion87 decks304 decks
-8%synergy
City of Brass
27%inclusion83 decks304 decks
12%synergy
Mana Confluence
27%inclusion81 decks304 decks
13%synergy
Scrubland
26%inclusion80 decks304 decks
10%synergy
Tundra
26%inclusion79 decks304 decks
10%synergy
Underground Sea
26%inclusion79 decks304 decks
10%synergy
Bloodstained Mire
25%inclusion75 decks304 decks
14%synergy
Scalding Tarn
23%inclusion71 decks304 decks
12%synergy
Verdant Catacombs
23%inclusion70 decks304 decks
13%synergy
Misty Rainforest
23%inclusion69 decks304 decks
12%synergy
Evolving Wilds
23%inclusion69 decks304 decks
-2%synergy
Gemstone Caverns
23%inclusion69 decks304 decks
15%synergy
Windswept Heath
22%inclusion67 decks304 decks
12%synergy
Prairie Stream
22%inclusion66 decks304 decks
-19%synergy
Sunken Hollow
21%inclusion64 decks304 decks
-19%synergy
Temple of Silence
20%inclusion62 decks304 decks
1%synergy
Terramorphic Expanse
20%inclusion61 decks304 decks
4%synergy
Temple of Deceit
20%inclusion61 decks304 decks
2%synergy
Contaminated Landscape
20%inclusion60 decks304 decks
6%synergy
Arid Mesa
20%inclusion60 decks304 decks
10%synergy
Temple of Enlightenment
19%inclusion59 decks304 decks
3%synergy
Deserted Beach
19%inclusion58 decks304 decks
-2%synergy
Shipwreck Marsh
19%inclusion57 decks304 decks
-2%synergy
Gloomlake Verge
18%inclusion56 decks304 decks
7%synergy
Floodfarm Verge
17%inclusion53 decks304 decks
6%synergy
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