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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Enchantments
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Utility Lands
Mana Artifacts
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Mornsong Aria
8.3%inclusion5 decks60 decks
8%synergy
Twilight Diviner
6.9%inclusion4 decks58 decks
6%synergy
Does Machines
3.8%inclusion2 decks53 decks
4%synergy
Noggle the Mind
3.4%inclusion2 decks58 decks
3%synergy
Retro-Mutation
2.9%inclusion1 decks35 decks
2%synergy
High Synergy Cards
Ripples of Undeath
64%inclusion195 decks307 decks
61%synergy
Animate Dead
69%inclusion212 decks307 decks
59%synergy
Necromancy
59%inclusion182 decks307 decks
55%synergy
Dress Down
55%inclusion169 decks307 decks
53%synergy
Inquisitive Glimmer
59%inclusion182 decks307 decks
52%synergy
Entity Tracker
49%inclusion151 decks307 decks
43%synergy
Scrabbling Skullcrab
43%inclusion132 decks307 decks
42%synergy
Mesa Enchantress
51%inclusion156 decks307 decks
42%synergy
Gravebreaker Lamia
41%inclusion127 decks307 decks
40%synergy
Dance of the Dead
42%inclusion129 decks307 decks
40%synergy
Top Cards
Mystic Remora
60%inclusion183 decks307 decks
39%synergy
Swords to Plowshares
57%inclusion176 decks307 decks
-11%synergy
Sevinne's Reclamation
48%inclusion147 decks307 decks
39%synergy
Starfield Mystic
43%inclusion133 decks307 decks
37%synergy
Entomb
41%inclusion127 decks307 decks
35%synergy
Overlord of the Balemurk
41%inclusion126 decks307 decks
39%synergy
Dark Ritual
40%inclusion124 decks307 decks
21%synergy
Demon of Fate's Design
40%inclusion123 decks307 decks
35%synergy
Blind Obedience
38%inclusion116 decks307 decks
26%synergy
Doomwake Giant
37%inclusion115 decks307 decks
32%synergy
Game Changers
Smothering Tithe
50%inclusion154 decks307 decks
19%synergy
Rhystic Study
45%inclusion138 decks307 decks
14%synergy
Enlightened Tutor
39%inclusion120 decks307 decks
20%synergy
Demonic Tutor
32%inclusion98 decks307 decks
11%synergy
Thassa's Oracle
30%inclusion92 decks307 decks
21%synergy
Vampiric Tutor
27%inclusion84 decks307 decks
10%synergy
Ancient Tomb
27%inclusion82 decks307 decks
14%synergy
Force of Will
25%inclusion76 decks307 decks
12%synergy
Mana Vault
24%inclusion74 decks307 decks
15%synergy
Chrome Mox
23%inclusion71 decks307 decks
14%synergy
Creatures
Overlord of the Floodpits
36%inclusion109 decks307 decks
32%synergy
Fear of Sleep Paralysis
36%inclusion109 decks307 decks
30%synergy
Victor, Valgavoth's Seneschal
33%inclusion101 decks307 decks
31%synergy
Esper Sentinel
32%inclusion98 decks307 decks
5%synergy
Abdel Adrian, Gorion's Ward
32%inclusion97 decks307 decks
30%synergy
Fear of Impostors
31%inclusion96 decks307 decks
30%synergy
Ondu Spiritdancer
30%inclusion91 decks307 decks
23%synergy
Lotho, Corrupt Shirriff
27%inclusion84 decks307 decks
11%synergy
Grand Abolisher
26%inclusion80 decks307 decks
12%synergy
Zur, Eternal Schemer
25%inclusion78 decks307 decks
22%synergy
Ghostly Dancers
24%inclusion73 decks307 decks
21%synergy
Valley Floodcaller
22%inclusion69 decks307 decks
18%synergy
Orcish Bowmasters
22%inclusion68 decks307 decks
12%synergy
Heliod, the Radiant Dawn
22%inclusion68 decks307 decks
18%synergy
Grim Guardian
22%inclusion67 decks307 decks
19%synergy
Silent Hallcreeper
21%inclusion66 decks307 decks
17%synergy
Zur the Enchanter
21%inclusion65 decks307 decks
16%synergy
Wan Shi Tong, Librarian
20%inclusion17 decks83 decks
15%synergy
Enduring Curiosity
20%inclusion62 decks307 decks
12%synergy
Mindwrack Harpy
20%inclusion62 decks307 decks
20%synergy
Hedron Crab
20%inclusion60 decks307 decks
19%synergy
Hullbreaker Horror
20%inclusion60 decks307 decks
13%synergy
Ranger-Captain of Eos
19%inclusion57 decks307 decks
12%synergy
Displacer Kitten
18%inclusion54 decks307 decks
11%synergy
Sage of Mysteries
17%inclusion51 decks307 decks
16%synergy
Ledger Shredder
16%inclusion49 decks307 decks
7%synergy
Alseid of Life's Bounty
15%inclusion46 decks307 decks
14%synergy
Moon-Blessed Cleric
15%inclusion45 decks307 decks
10%synergy
Skullsnap Nuisance
15%inclusion45 decks307 decks
14%synergy
Archon of Sun's Grace
14%inclusion44 decks307 decks
10%synergy
Lurrus of the Dream-Den
14%inclusion43 decks307 decks
12%synergy
Aminatou, Veil Piercer
14%inclusion42 decks307 decks
12%synergy
Soaring Lightbringer
14%inclusion42 decks307 decks
9%synergy
Voice of Victory
13%inclusion22 decks168 decks
5%synergy
Overlord of the Mistmoors
13%inclusion39 decks307 decks
11%synergy
Balemurk Leech
12%inclusion37 decks307 decks
11%synergy
Mockingbird
12%inclusion37 decks307 decks
8%synergy
Opposition Agent
12%inclusion36 decks307 decks
3%synergy
Drannith Magistrate
11%inclusion33 decks307 decks
3%synergy
Laboratory Maniac
11%inclusion33 decks307 decks
7%synergy
Spirited Companion
10%inclusion31 decks307 decks
8%synergy
Tataru Taru
10%inclusion14 decks142 decks
2%synergy
The Mindskinner
10%inclusion30 decks307 decks
9%synergy
Ancient Cellarspawn
10%inclusion30 decks307 decks
7%synergy
Nashi, Searcher in the Dark
10%inclusion30 decks307 decks
9%synergy
Archivist of Oghma
9.4%inclusion29 decks307 decks
3%synergy
Stitcher's Supplier
9.4%inclusion29 decks307 decks
9%synergy
Gremlin Tamer
9.4%inclusion29 decks307 decks
8%synergy
Millikin
9.1%inclusion28 decks307 decks
9%synergy
Athreos, Shroud-Veiled
8.5%inclusion26 decks307 decks
4%synergy
Instants
An Offer You Can't Refuse
33%inclusion102 decks307 decks
6%synergy
Counterspell
32%inclusion98 decks307 decks
-10%synergy
Swan Song
29%inclusion89 decks307 decks
9%synergy
Path to Exile
27%inclusion83 decks307 decks
-15%synergy
Silence
25%inclusion76 decks307 decks
15%synergy
Arcane Denial
24%inclusion74 decks307 decks
4%synergy
Fierce Guardianship
23%inclusion70 decks307 decks
2%synergy
Demonic Consultation
21%inclusion66 decks307 decks
14%synergy
Force of Negation
21%inclusion66 decks307 decks
10%synergy
Flusterstorm
21%inclusion63 decks307 decks
13%synergy
Tainted Pact
20%inclusion62 decks307 decks
13%synergy
Intuition
20%inclusion62 decks307 decks
19%synergy
Mental Misstep
20%inclusion60 decks307 decks
13%synergy
Borne Upon a Wind
19%inclusion59 decks307 decks
14%synergy
Cyclonic Rift
19%inclusion59 decks307 decks
-4%synergy
Pact of Negation
19%inclusion57 decks307 decks
11%synergy
Mindbreak Trap
18%inclusion56 decks307 decks
12%synergy
Cabal Ritual
18%inclusion56 decks307 decks
15%synergy
Mystical Tutor
18%inclusion56 decks307 decks
7%synergy
Dovin's Veto
18%inclusion55 decks307 decks
-8%synergy
Void Rend
18%inclusion55 decks307 decks
-17%synergy
Sink into Stupor
17%inclusion51 decks307 decks
4%synergy
Frantic Search
16%inclusion49 decks307 decks
-2%synergy
Mana Drain
14%inclusion44 decks307 decks
-3%synergy
Otherworldly Gaze
14%inclusion44 decks307 decks
12%synergy
Thirst for Meaning
14%inclusion42 decks307 decks
12%synergy
Gifts Ungiven
12%inclusion38 decks307 decks
10%synergy
Into the Flood Maw
12%inclusion36 decks307 decks
8%synergy
Negate
11%inclusion34 decks307 decks
-5%synergy
Fell the Profane
8.8%inclusion27 decks307 decks
0%synergy
Brainstorm
8.8%inclusion27 decks307 decks
-8%synergy
Chain of Vapor
8.5%inclusion26 decks307 decks
5%synergy
Anguished Unmaking
8.1%inclusion25 decks307 decks
-17%synergy
Retraction Helix
7.2%inclusion22 decks307 decks
6%synergy
Brain Freeze
7.2%inclusion22 decks307 decks
7%synergy
Faithful Mending
7.2%inclusion22 decks307 decks
3%synergy
Strix Serenade
6.8%inclusion21 decks307 decks
3%synergy
Inkshield
6.2%inclusion19 decks307 decks
-3%synergy
Thought Scour
6.2%inclusion19 decks307 decks
5%synergy
Generous Gift
5.5%inclusion17 decks307 decks
-9%synergy
Teferi's Protection
5.2%inclusion16 decks307 decks
-11%synergy
Drown in the Loch
5.2%inclusion16 decks307 decks
3%synergy
Sorceries
Reanimate
28%inclusion87 decks307 decks
12%synergy
Windfall
27%inclusion83 decks307 decks
14%synergy
Redress Fate
24%inclusion74 decks307 decks
18%synergy
Imperial Seal
19%inclusion58 decks307 decks
12%synergy
Singularity Rupture
19%inclusion23 decks122 decks
17%synergy
Toxic Deluge
18%inclusion56 decks307 decks
-1%synergy
Dance of the Manse
16%inclusion48 decks307 decks
12%synergy
Space-Time Anomaly
14%inclusion17 decks119 decks
13%synergy
Glimpse the Unthinkable
14%inclusion42 decks307 decks
13%synergy
Damn
12%inclusion38 decks307 decks
-8%synergy
Extinguish All Hope
12%inclusion38 decks307 decks
11%synergy
Lively Dirge
12%inclusion36 decks307 decks
10%synergy
Demonic Counsel
12%inclusion36 decks307 decks
11%synergy
Resurgent Belief
8.1%inclusion25 decks307 decks
6%synergy
Beseech the Mirror
8.1%inclusion25 decks307 decks
4%synergy
Breach the Multiverse
7.8%inclusion24 decks307 decks
6%synergy
Unmarked Grave
7.5%inclusion23 decks307 decks
6%synergy
Traumatize
7.5%inclusion23 decks307 decks
7%synergy
Idyllic Tutor
6.5%inclusion20 decks307 decks
2%synergy
Supreme Verdict
6.2%inclusion19 decks307 decks
-9%synergy
Replenish
6.2%inclusion19 decks307 decks
4%synergy
Wrath of God
6.2%inclusion19 decks307 decks
2%synergy
Maddening Cacophony
6.2%inclusion19 decks307 decks
5%synergy
Time Wipe
5.9%inclusion18 decks307 decks
-1%synergy
Cut Your Losses
5.9%inclusion18 decks307 decks
5%synergy
Buried Alive
5.9%inclusion18 decks307 decks
2%synergy
Ponder
5.5%inclusion17 decks307 decks
-4%synergy
Farewell
5.5%inclusion17 decks307 decks
-7%synergy
Utility Artifacts
Mesmeric Orb
28%inclusion85 decks307 decks
27%synergy
The One Ring
18%inclusion55 decks307 decks
5%synergy
Wishclaw Talisman
17%inclusion52 decks307 decks
9%synergy
Lightning Greaves
10%inclusion30 decks307 decks
-13%synergy
Cloud Key
6.8%inclusion21 decks307 decks
4%synergy
Wayfarer's Bauble
6.8%inclusion21 decks307 decks
-1%synergy
Altar of Dementia
6.2%inclusion19 decks307 decks
5%synergy
Mindcrank
6.2%inclusion19 decks307 decks
4%synergy
Altar of the Brood
5.2%inclusion16 decks307 decks
4%synergy
Enchantments
Mirrormade
37%inclusion114 decks307 decks
27%synergy
Amphibian Downpour
36%inclusion112 decks307 decks
32%synergy
Cemetery Tampering
35%inclusion106 decks307 decks
34%synergy
Propaganda
34%inclusion103 decks307 decks
6%synergy
Sphere of Safety
31%inclusion96 decks307 decks
22%synergy
Seal of Cleansing
31%inclusion95 decks307 decks
29%synergy
Secret Arcade // Dusty Parlor
30%inclusion93 decks307 decks
26%synergy
Grasp of Fate
30%inclusion92 decks307 decks
24%synergy
Ghostly Prison
28%inclusion86 decks307 decks
6%synergy
Starfield of Nyx
24%inclusion75 decks307 decks
20%synergy
Sigil of the Empty Throne
23%inclusion72 decks307 decks
18%synergy
Touch the Spirit Realm
23%inclusion70 decks307 decks
20%synergy
Estrid's Invocation
23%inclusion70 decks307 decks
18%synergy
Out of the Tombs
22%inclusion69 decks307 decks
22%synergy
The Meathook Massacre
22%inclusion68 decks307 decks
19%synergy
Cacophony Unleashed
21%inclusion66 decks307 decks
20%synergy
Necropotence
21%inclusion66 decks307 decks
15%synergy
Stillness in Motion
21%inclusion35 decks166 decks
21%synergy
Court of Cunning
21%inclusion64 decks307 decks
20%synergy
Defiled Crypt // Cadaver Lab
21%inclusion63 decks305 decks
20%synergy
Polluted Cistern // Dim Oubliette
21%inclusion63 decks306 decks
20%synergy
Static Prison
20%inclusion62 decks307 decks
20%synergy
The Tale of Tamiyo
20%inclusion61 decks307 decks
19%synergy
Tinybones Joins Up
20%inclusion60 decks307 decks
18%synergy
Seal of Removal
19%inclusion59 decks307 decks
19%synergy
Monologue Tax
18%inclusion55 decks307 decks
12%synergy
Darksteel Mutation
16%inclusion50 decks307 decks
10%synergy
Greater Auramancy
16%inclusion50 decks307 decks
12%synergy
Copy Enchantment
16%inclusion49 decks307 decks
11%synergy
Black Market Connections
15%inclusion46 decks307 decks
1%synergy
Hallowed Haunting
14%inclusion43 decks307 decks
12%synergy
Shark Typhoon
14%inclusion42 decks307 decks
8%synergy
Phyrexian Arena
14%inclusion42 decks307 decks
0%synergy
All That Glitters
13%inclusion41 decks307 decks
5%synergy
Ethereal Armor
13%inclusion41 decks307 decks
9%synergy
Founding the Third Path
13%inclusion39 decks307 decks
13%synergy
Secrets of the Dead
13%inclusion39 decks307 decks
12%synergy
Leyline of Anticipation
12%inclusion38 decks307 decks
8%synergy
Chthonian Nightmare
12%inclusion36 decks307 decks
11%synergy
Sheltered by Ghosts
12%inclusion36 decks307 decks
9%synergy
Nowhere to Run
11%inclusion35 decks307 decks
10%synergy
Teval's Judgment
11%inclusion19 decks168 decks
11%synergy
Imprisoned in the Moon
11%inclusion34 decks307 decks
4%synergy
Restricted Office // Lecture Hall
11%inclusion34 decks307 decks
9%synergy
Timely Ward
10%inclusion32 decks307 decks
5%synergy
Extravagant Replication
10%inclusion30 decks307 decks
5%synergy
Central Elevator // Promising Stairs
10%inclusion30 decks307 decks
9%synergy
Aura of Silence
10%inclusion30 decks307 decks
7%synergy
Unable to Scream
9.4%inclusion29 decks307 decks
8%synergy
Authority of the Consuls
9.4%inclusion29 decks307 decks
-3%synergy
Battles
Invasion of Theros
6.2%inclusion19 decks307 decks
4%synergy
Planeswalkers
Teferi, Time Raveler
15%inclusion46 decks307 decks
7%synergy
Jace, Wielder of Mysteries
8.8%inclusion27 decks307 decks
7%synergy
Utility Lands
Hall of Heliod's Generosity
45%inclusion138 decks307 decks
32%synergy
Otawara, Soaring City
37%inclusion113 decks307 decks
18%synergy
Bojuka Bog
33%inclusion101 decks307 decks
6%synergy
Takenuma, Abandoned Mire
21%inclusion63 decks307 decks
14%synergy
Cephalid Coliseum
17%inclusion51 decks307 decks
13%synergy
Urza's Saga
16%inclusion49 decks307 decks
4%synergy
Reliquary Tower
14%inclusion42 decks307 decks
-20%synergy
Urborg, Tomb of Yawgmoth
11%inclusion34 decks307 decks
-2%synergy
Serra's Sanctum
10%inclusion32 decks307 decks
9%synergy
Emergence Zone
10%inclusion32 decks307 decks
8%synergy
Nephalia Drownyard
10%inclusion30 decks307 decks
9%synergy
Halimar Depths
7.2%inclusion22 decks307 decks
2%synergy
Minamo, School at Water's Edge
6.2%inclusion19 decks307 decks
2%synergy
Ishgard, the Holy See
5.6%inclusion8 decks142 decks
2%synergy
Rogue's Passage
5.5%inclusion17 decks307 decks
-4%synergy
Mana Artifacts
Arcane Signet
90%inclusion277 decks307 decks
2%synergy
Sol Ring
89%inclusion272 decks307 decks
-1%synergy
Talisman of Dominance
58%inclusion178 decks307 decks
8%synergy
Talisman of Progress
50%inclusion154 decks307 decks
6%synergy
Talisman of Hierarchy
47%inclusion145 decks307 decks
3%synergy
Fellwar Stone
42%inclusion129 decks307 decks
9%synergy
Azorius Signet
27%inclusion82 decks307 decks
-4%synergy
Orzhov Signet
24%inclusion74 decks307 decks
-9%synergy
Lotus Petal
24%inclusion73 decks307 decks
13%synergy
Dimir Signet
22%inclusion67 decks307 decks
-9%synergy
Mox Diamond
20%inclusion60 decks307 decks
13%synergy
Mox Opal
19%inclusion58 decks307 decks
10%synergy
Lion's Eye Diamond
17%inclusion52 decks307 decks
15%synergy
Mox Amber
10%inclusion31 decks307 decks
4%synergy
Mind Stone
8.5%inclusion26 decks307 decks
-4%synergy
Grim Monolith
8.1%inclusion25 decks307 decks
5%synergy
Commander's Sphere
7.5%inclusion23 decks307 decks
-11%synergy
Thought Vessel
6.8%inclusion21 decks307 decks
-18%synergy
Chromatic Lantern
5.2%inclusion16 decks307 decks
-8%synergy
Lands
Command Tower
97%inclusion297 decks307 decks
4%synergy
Island
85%inclusion261 decks307 decks
-8%synergy
Swamp
83%inclusion254 decks307 decks
-9%synergy
Plains
81%inclusion249 decks307 decks
-11%synergy
Watery Grave
61%inclusion187 decks307 decks
10%synergy
Exotic Orchard
61%inclusion186 decks307 decks
2%synergy
Hallowed Fountain
60%inclusion185 decks307 decks
10%synergy
Godless Shrine
59%inclusion181 decks307 decks
8%synergy
Polluted Delta
56%inclusion171 decks307 decks
18%synergy
Flooded Strand
56%inclusion171 decks307 decks
17%synergy
Marsh Flats
51%inclusion156 decks307 decks
15%synergy
Arcane Sanctum
46%inclusion140 decks307 decks
-9%synergy
Adarkar Wastes
43%inclusion133 decks307 decks
12%synergy
Undercity Sewers
40%inclusion124 decks307 decks
26%synergy
Caves of Koilos
40%inclusion122 decks307 decks
4%synergy
Raffine's Tower
39%inclusion121 decks307 decks
-1%synergy
Morphic Pool
39%inclusion121 decks307 decks
5%synergy
Underground River
39%inclusion119 decks307 decks
5%synergy
Vault of Champions
38%inclusion118 decks307 decks
6%synergy
Sea of Clouds
38%inclusion117 decks307 decks
3%synergy
Meticulous Archive
34%inclusion103 decks307 decks
20%synergy
Shadowy Backstreet
33%inclusion100 decks307 decks
20%synergy
Isolated Chapel
32%inclusion99 decks307 decks
-8%synergy
Valgavoth's Lair
30%inclusion91 decks307 decks
27%synergy
Glacial Fortress
29%inclusion89 decks307 decks
-13%synergy
Drowned Catacomb
28%inclusion87 decks307 decks
-9%synergy
City of Brass
27%inclusion83 decks307 decks
12%synergy
Scrubland
26%inclusion81 decks307 decks
10%synergy
Mana Confluence
26%inclusion81 decks307 decks
13%synergy
Tundra
26%inclusion80 decks307 decks
10%synergy
Underground Sea
26%inclusion80 decks307 decks
10%synergy
Bloodstained Mire
24%inclusion75 decks307 decks
14%synergy
Scalding Tarn
23%inclusion71 decks307 decks
12%synergy
Verdant Catacombs
23%inclusion70 decks307 decks
13%synergy
Evolving Wilds
23%inclusion70 decks307 decks
-2%synergy
Misty Rainforest
22%inclusion69 decks307 decks
12%synergy
Gemstone Caverns
22%inclusion69 decks307 decks
15%synergy
Windswept Heath
22%inclusion67 decks307 decks
12%synergy
Prairie Stream
22%inclusion67 decks307 decks
-19%synergy
Sunken Hollow
21%inclusion64 decks307 decks
-19%synergy
Temple of Silence
21%inclusion63 decks307 decks
2%synergy
Terramorphic Expanse
20%inclusion62 decks307 decks
4%synergy
Temple of Deceit
20%inclusion61 decks307 decks
2%synergy
Contaminated Landscape
20%inclusion60 decks307 decks
6%synergy
Temple of Enlightenment
20%inclusion60 decks307 decks
3%synergy
Arid Mesa
20%inclusion60 decks307 decks
10%synergy
Deserted Beach
19%inclusion59 decks307 decks
-2%synergy
Shipwreck Marsh
19%inclusion58 decks307 decks
-2%synergy
Gloomlake Verge
19%inclusion57 decks307 decks
8%synergy
Floodfarm Verge
18%inclusion54 decks307 decks
6%synergy
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