The Master of Keys (Commander) - Optimized

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
Planeswalkers
Utility Lands
Mana Artifacts
Lands
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Mornsong Aria
5.0%inclusion3 decks60 decks
4%synergy
Shredder's Technique
4.2%inclusion1 decks24 decks
3%synergy
Moonshadow
1.8%inclusion1 decks55 decks
2%synergy
Winnowing
1.7%inclusion1 decks60 decks
1%synergy
High Synergy Cards
Animate Dead
78%inclusion215 decks277 decks
68%synergy
Ripples of Undeath
67%inclusion186 decks277 decks
64%synergy
Necromancy
67%inclusion186 decks277 decks
63%synergy
Dress Down
63%inclusion175 decks277 decks
61%synergy
Entomb
58%inclusion161 decks277 decks
51%synergy
Abdel Adrian, Gorion's Ward
52%inclusion145 decks277 decks
51%synergy
Mystic Remora
71%inclusion198 decks277 decks
50%synergy
Inquisitive Glimmer
57%inclusion159 decks277 decks
50%synergy
Sevinne's Reclamation
57%inclusion158 decks277 decks
48%synergy
Entity Tracker
52%inclusion145 decks277 decks
46%synergy
Top Cards
Swords to Plowshares
63%inclusion175 decks277 decks
-5%synergy
Mesa Enchantress
53%inclusion147 decks277 decks
44%synergy
Mirrormade
49%inclusion137 decks277 decks
40%synergy
Starfield Mystic
47%inclusion129 decks277 decks
40%synergy
Blind Obedience
45%inclusion126 decks277 decks
33%synergy
Dance of the Dead
45%inclusion125 decks277 decks
43%synergy
Gravebreaker Lamia
45%inclusion125 decks277 decks
44%synergy
Dark Ritual
44%inclusion122 decks277 decks
25%synergy
Amphibian Downpour
43%inclusion119 decks277 decks
38%synergy
An Offer You Can't Refuse
43%inclusion118 decks277 decks
16%synergy
Game Changers
Rhystic Study
65%inclusion179 decks277 decks
33%synergy
Smothering Tithe
62%inclusion172 decks277 decks
31%synergy
Enlightened Tutor
50%inclusion139 decks277 decks
31%synergy
Demonic Tutor
44%inclusion122 decks277 decks
23%synergy
Vampiric Tutor
39%inclusion107 decks277 decks
21%synergy
Thassa's Oracle
33%inclusion91 decks277 decks
23%synergy
Cyclonic Rift
31%inclusion85 decks277 decks
7%synergy
Necropotence
30%inclusion84 decks277 decks
24%synergy
Fierce Guardianship
30%inclusion84 decks277 decks
10%synergy
Ancient Tomb
28%inclusion77 decks277 decks
15%synergy
Creatures
Demon of Fate's Design
43%inclusion118 decks277 decks
37%synergy
Scrabbling Skullcrab
42%inclusion117 decks277 decks
41%synergy
Overlord of the Balemurk
38%inclusion106 decks277 decks
36%synergy
Esper Sentinel
38%inclusion104 decks277 decks
10%synergy
Ondu Spiritdancer
37%inclusion102 decks277 decks
31%synergy
Overlord of the Floodpits
35%inclusion98 decks277 decks
32%synergy
Fear of Sleep Paralysis
35%inclusion97 decks277 decks
30%synergy
Doomwake Giant
34%inclusion95 decks277 decks
28%synergy
Fear of Impostors
34%inclusion93 decks277 decks
32%synergy
Zur, Eternal Schemer
31%inclusion86 decks277 decks
28%synergy
Lotho, Corrupt Shirriff
30%inclusion84 decks277 decks
13%synergy
Grand Abolisher
29%inclusion81 decks277 decks
15%synergy
Victor, Valgavoth's Seneschal
28%inclusion77 decks277 decks
26%synergy
Zur the Enchanter
25%inclusion69 decks277 decks
20%synergy
Hullbreaker Horror
23%inclusion63 decks277 decks
17%synergy
Heliod, the Radiant Dawn
22%inclusion62 decks277 decks
19%synergy
Grim Guardian
22%inclusion61 decks277 decks
19%synergy
Orcish Bowmasters
22%inclusion61 decks277 decks
11%synergy
Valley Floodcaller
22%inclusion60 decks277 decks
18%synergy
Moon-Blessed Cleric
20%inclusion55 decks277 decks
15%synergy
Displacer Kitten
19%inclusion53 decks277 decks
12%synergy
Ghostly Dancers
19%inclusion53 decks277 decks
17%synergy
Ledger Shredder
19%inclusion52 decks277 decks
10%synergy
Silent Hallcreeper
18%inclusion51 decks277 decks
14%synergy
Enduring Curiosity
18%inclusion49 decks277 decks
10%synergy
Soaring Lightbringer
17%inclusion48 decks277 decks
13%synergy
Lurrus of the Dream-Den
16%inclusion44 decks277 decks
14%synergy
Aminatou, Veil Piercer
16%inclusion43 decks277 decks
14%synergy
Hedron Crab
14%inclusion39 decks277 decks
13%synergy
Opposition Agent
14%inclusion38 decks277 decks
5%synergy
Balemurk Leech
14%inclusion38 decks277 decks
13%synergy
Ranger-Captain of Eos
13%inclusion35 decks277 decks
6%synergy
Archon of Sun's Grace
12%inclusion33 decks277 decks
7%synergy
Talion, the Kindly Lord
12%inclusion33 decks277 decks
4%synergy
Wan Shi Tong, Librarian
12%inclusion11 decks95 decks
6%synergy
Archetype of Imagination
11%inclusion31 decks277 decks
6%synergy
Psychic Frog
11%inclusion31 decks277 decks
4%synergy
Gremlin Tamer
11%inclusion30 decks277 decks
10%synergy
Mindwrack Harpy
11%inclusion30 decks277 decks
11%synergy
Voice of Victory
10%inclusion24 decks229 decks
2%synergy
Drannith Magistrate
10%inclusion29 decks277 decks
3%synergy
Archivist of Oghma
10%inclusion27 decks277 decks
3%synergy
Overlord of the Mistmoors
10%inclusion27 decks277 decks
8%synergy
Skullsnap Nuisance
10%inclusion27 decks277 decks
9%synergy
Mockingbird
9.4%inclusion26 decks277 decks
5%synergy
Ancient Cellarspawn
9.0%inclusion25 decks277 decks
6%synergy
Spirited Companion
8.7%inclusion24 decks277 decks
7%synergy
Faerie Mastermind
8.7%inclusion24 decks277 decks
-1%synergy
Athreos, Shroud-Veiled
8.3%inclusion23 decks277 decks
4%synergy
Leonin Relic-Warder
7.9%inclusion22 decks277 decks
8%synergy
Instants
Path to Exile
33%inclusion92 decks277 decks
-9%synergy
Swan Song
32%inclusion89 decks277 decks
12%synergy
Counterspell
31%inclusion85 decks277 decks
-11%synergy
Arcane Denial
30%inclusion83 decks277 decks
10%synergy
Mana Drain
27%inclusion75 decks277 decks
10%synergy
Silence
25%inclusion69 decks277 decks
15%synergy
Mystical Tutor
24%inclusion67 decks277 decks
13%synergy
Force of Will
23%inclusion64 decks277 decks
11%synergy
Flusterstorm
22%inclusion60 decks277 decks
14%synergy
Force of Negation
20%inclusion55 decks277 decks
8%synergy
Demonic Consultation
19%inclusion53 decks277 decks
11%synergy
Dovin's Veto
19%inclusion52 decks277 decks
-7%synergy
Sink into Stupor
19%inclusion52 decks277 decks
6%synergy
Gifts Ungiven
18%inclusion49 decks277 decks
15%synergy
Intuition
17%inclusion46 decks277 decks
15%synergy
Tainted Pact
15%inclusion42 decks277 decks
8%synergy
Cabal Ritual
15%inclusion42 decks277 decks
12%synergy
Borne Upon a Wind
15%inclusion42 decks277 decks
10%synergy
Frantic Search
14%inclusion38 decks277 decks
-4%synergy
Brainstorm
13%inclusion37 decks277 decks
-4%synergy
Pact of Negation
13%inclusion37 decks277 decks
6%synergy
Teferi's Protection
13%inclusion36 decks277 decks
-4%synergy
Inkshield
13%inclusion36 decks277 decks
4%synergy
Mindbreak Trap
13%inclusion35 decks277 decks
6%synergy
Thirst for Meaning
12%inclusion33 decks277 decks
10%synergy
Mental Misstep
11%inclusion31 decks277 decks
4%synergy
Void Rend
11%inclusion31 decks277 decks
-23%synergy
Otherworldly Gaze
11%inclusion30 decks277 decks
9%synergy
Into the Flood Maw
10%inclusion28 decks277 decks
6%synergy
Negate
8.3%inclusion23 decks277 decks
-8%synergy
Anguished Unmaking
7.9%inclusion22 decks277 decks
-17%synergy
Fell the Profane
7.6%inclusion21 decks277 decks
-1%synergy
Muddle the Mixture
7.6%inclusion21 decks277 decks
4%synergy
Utter End
6.9%inclusion19 decks277 decks
0%synergy
Chain of Vapor
6.1%inclusion17 decks277 decks
3%synergy
Ad Nauseam
6.1%inclusion17 decks277 decks
4%synergy
Waterlogged Teachings
6.1%inclusion17 decks277 decks
2%synergy
Deadly Rollick
5.8%inclusion16 decks277 decks
-9%synergy
Brain Freeze
5.8%inclusion16 decks277 decks
5%synergy
Return to Dust
5.1%inclusion14 decks277 decks
1%synergy
Sorceries
Reanimate
29%inclusion81 decks277 decks
13%synergy
Windfall
29%inclusion80 decks277 decks
15%synergy
Redress Fate
25%inclusion69 decks277 decks
19%synergy
Toxic Deluge
23%inclusion63 decks277 decks
3%synergy
Demonic Counsel
14%inclusion38 decks277 decks
13%synergy
Glimpse the Unthinkable
13%inclusion35 decks277 decks
12%synergy
Damn
12%inclusion34 decks277 decks
-8%synergy
Singularity Rupture
12%inclusion18 decks147 decks
10%synergy
Lively Dirge
12%inclusion33 decks277 decks
11%synergy
Idyllic Tutor
11%inclusion31 decks277 decks
7%synergy
Unmarked Grave
10%inclusion29 decks277 decks
9%synergy
Supreme Verdict
10%inclusion28 decks277 decks
-5%synergy
Extinguish All Hope
10%inclusion28 decks277 decks
8%synergy
Imperial Seal
9.4%inclusion26 decks277 decks
2%synergy
Beseech the Mirror
9.0%inclusion25 decks277 decks
5%synergy
Replenish
8.7%inclusion24 decks277 decks
7%synergy
Dance of the Manse
8.3%inclusion23 decks277 decks
5%synergy
Time Wipe
7.6%inclusion21 decks277 decks
1%synergy
Farewell
7.6%inclusion21 decks277 decks
-5%synergy
Buried Alive
7.6%inclusion21 decks277 decks
3%synergy
Resurgent Belief
6.5%inclusion18 decks277 decks
4%synergy
Ponder
6.1%inclusion17 decks277 decks
-3%synergy
Terminus
5.1%inclusion14 decks277 decks
1%synergy
Read the Bones
5.1%inclusion14 decks277 decks
1%synergy
Utility Artifacts
The One Ring
25%inclusion70 decks277 decks
12%synergy
Mesmeric Orb
21%inclusion58 decks277 decks
20%synergy
Wishclaw Talisman
20%inclusion55 decks277 decks
12%synergy
Lightning Greaves
9.0%inclusion25 decks277 decks
-13%synergy
Sensei's Divining Top
6.1%inclusion17 decks277 decks
-4%synergy
Cloud Key
5.1%inclusion14 decks277 decks
2%synergy
Enchantments
Sphere of Safety
41%inclusion113 decks277 decks
31%synergy
Secret Arcade // Dusty Parlor
40%inclusion110 decks277 decks
35%synergy
Propaganda
36%inclusion100 decks277 decks
9%synergy
Ghostly Prison
32%inclusion88 decks277 decks
10%synergy
Grasp of Fate
31%inclusion87 decks277 decks
25%synergy
Seal of Cleansing
31%inclusion86 decks277 decks
30%synergy
The Meathook Massacre
31%inclusion85 decks277 decks
27%synergy
Tinybones Joins Up
30%inclusion82 decks277 decks
28%synergy
Cemetery Tampering
26%inclusion73 decks277 decks
26%synergy
Starfield of Nyx
25%inclusion69 decks277 decks
21%synergy
Sigil of the Empty Throne
25%inclusion68 decks277 decks
19%synergy
Estrid's Invocation
23%inclusion64 decks277 decks
18%synergy
Touch the Spirit Realm
22%inclusion60 decks277 decks
19%synergy
Monologue Tax
21%inclusion59 decks277 decks
15%synergy
Static Prison
20%inclusion55 decks277 decks
19%synergy
Greater Auramancy
19%inclusion53 decks277 decks
15%synergy
Cacophony Unleashed
19%inclusion52 decks277 decks
17%synergy
Darksteel Mutation
18%inclusion51 decks277 decks
12%synergy
Black Market Connections
18%inclusion51 decks277 decks
4%synergy
Seal of Removal
17%inclusion48 decks277 decks
17%synergy
Shark Typhoon
16%inclusion45 decks277 decks
10%synergy
Out of the Tombs
16%inclusion43 decks277 decks
15%synergy
Leyline of Anticipation
16%inclusion43 decks277 decks
11%synergy
Stillness in Motion
15%inclusion33 decks221 decks
15%synergy
Extravagant Replication
14%inclusion40 decks277 decks
9%synergy
Timely Ward
14%inclusion39 decks277 decks
9%synergy
Phyrexian Arena
14%inclusion39 decks277 decks
0%synergy
Trouble in Pairs
14%inclusion39 decks277 decks
9%synergy
Defiled Crypt // Cadaver Lab
14%inclusion38 decks277 decks
13%synergy
The Tale of Tamiyo
13%inclusion37 decks277 decks
13%synergy
Authority of the Consuls
12%inclusion34 decks277 decks
0%synergy
Sheltered by Ghosts
12%inclusion34 decks277 decks
10%synergy
Enchanted Evening
12%inclusion33 decks277 decks
10%synergy
Copy Enchantment
12%inclusion33 decks277 decks
7%synergy
Polluted Cistern // Dim Oubliette
12%inclusion33 decks277 decks
11%synergy
Land Tax
11%inclusion31 decks277 decks
5%synergy
Mirror Room // Fractured Realm
11%inclusion31 decks277 decks
9%synergy
Aura of Silence
11%inclusion31 decks277 decks
8%synergy
Imprisoned in the Moon
11%inclusion30 decks277 decks
4%synergy
The Eldest Reborn
11%inclusion30 decks277 decks
8%synergy
Ethereal Armor
11%inclusion30 decks277 decks
6%synergy
Restricted Office // Lecture Hall
10%inclusion29 decks277 decks
8%synergy
Bottomless Pool // Locker Room
10%inclusion29 decks277 decks
9%synergy
Hallowed Haunting
10%inclusion28 decks277 decks
8%synergy
One with the Multiverse
10%inclusion27 decks277 decks
5%synergy
Court of Cunning
10%inclusion27 decks277 decks
9%synergy
Central Elevator // Promising Stairs
10%inclusion27 decks277 decks
9%synergy
All That Glitters
9.4%inclusion26 decks277 decks
1%synergy
Oubliette
9.4%inclusion26 decks277 decks
8%synergy
Teval's Judgment
9.3%inclusion21 decks226 decks
8%synergy
Planeswalkers
Teferi, Time Raveler
22%inclusion60 decks277 decks
13%synergy
Utility Lands
Hall of Heliod's Generosity
55%inclusion152 decks277 decks
42%synergy
Otawara, Soaring City
36%inclusion100 decks277 decks
17%synergy
Bojuka Bog
34%inclusion94 decks277 decks
7%synergy
Takenuma, Abandoned Mire
21%inclusion57 decks277 decks
14%synergy
Urza's Saga
19%inclusion52 decks277 decks
7%synergy
Serra's Sanctum
17%inclusion48 decks277 decks
16%synergy
Reliquary Tower
14%inclusion40 decks277 decks
-19%synergy
Cephalid Coliseum
14%inclusion39 decks277 decks
10%synergy
Urborg, Tomb of Yawgmoth
14%inclusion39 decks277 decks
1%synergy
Emergence Zone
13%inclusion35 decks277 decks
11%synergy
Halimar Depths
10%inclusion27 decks277 decks
5%synergy
Minamo, School at Water's Edge
6.5%inclusion18 decks277 decks
3%synergy
Eiganjo, Seat of the Empire
6.1%inclusion17 decks277 decks
1%synergy
Mana Artifacts
Sol Ring
94%inclusion260 decks277 decks
4%synergy
Arcane Signet
92%inclusion256 decks277 decks
5%synergy
Talisman of Dominance
56%inclusion155 decks277 decks
6%synergy
Talisman of Hierarchy
51%inclusion140 decks277 decks
7%synergy
Talisman of Progress
49%inclusion137 decks277 decks
6%synergy
Fellwar Stone
42%inclusion116 decks277 decks
8%synergy
Azorius Signet
36%inclusion100 decks277 decks
5%synergy
Orzhov Signet
33%inclusion91 decks277 decks
0%synergy
Mana Vault
24%inclusion66 decks277 decks
15%synergy
Dimir Signet
23%inclusion65 decks277 decks
-8%synergy
Lotus Petal
23%inclusion65 decks277 decks
13%synergy
Chrome Mox
19%inclusion54 decks277 decks
10%synergy
Mind Stone
13%inclusion36 decks277 decks
1%synergy
Mox Opal
13%inclusion35 decks277 decks
4%synergy
Mox Amber
11%inclusion30 decks277 decks
5%synergy
Mox Diamond
11%inclusion30 decks277 decks
4%synergy
Lion's Eye Diamond
9.4%inclusion26 decks277 decks
7%synergy
Commander's Sphere
8.3%inclusion23 decks277 decks
-10%synergy
Thought Vessel
7.2%inclusion20 decks277 decks
-18%synergy
Basalt Monolith
5.1%inclusion14 decks277 decks
3%synergy
Lands
Command Tower
94%inclusion261 decks277 decks
2%synergy
Island
91%inclusion252 decks277 decks
-2%synergy
Swamp
91%inclusion251 decks277 decks
-1%synergy
Plains
90%inclusion248 decks277 decks
-2%synergy
Hallowed Fountain
66%inclusion182 decks277 decks
16%synergy
Watery Grave
65%inclusion181 decks277 decks
15%synergy
Godless Shrine
64%inclusion176 decks277 decks
13%synergy
Flooded Strand
59%inclusion164 decks277 decks
21%synergy
Polluted Delta
58%inclusion162 decks277 decks
21%synergy
Marsh Flats
56%inclusion154 decks277 decks
19%synergy
Exotic Orchard
53%inclusion148 decks277 decks
-5%synergy
Raffine's Tower
48%inclusion134 decks277 decks
7%synergy
Caves of Koilos
48%inclusion132 decks277 decks
12%synergy
Adarkar Wastes
47%inclusion130 decks277 decks
15%synergy
Underground River
46%inclusion128 decks277 decks
13%synergy
Sea of Clouds
44%inclusion122 decks277 decks
9%synergy
Arcane Sanctum
43%inclusion118 decks277 decks
-12%synergy
Morphic Pool
42%inclusion115 decks277 decks
7%synergy
Undercity Sewers
41%inclusion114 decks277 decks
27%synergy
Vault of Champions
41%inclusion113 decks277 decks
8%synergy
Shadowy Backstreet
35%inclusion98 decks277 decks
23%synergy
Meticulous Archive
35%inclusion96 decks277 decks
21%synergy
Glacial Fortress
34%inclusion95 decks277 decks
-7%synergy
Isolated Chapel
29%inclusion81 decks277 decks
-11%synergy
Tundra
26%inclusion73 decks277 decks
10%synergy
City of Brass
26%inclusion71 decks277 decks
11%synergy
Underground Sea
25%inclusion70 decks277 decks
10%synergy
Scrubland
25%inclusion70 decks277 decks
9%synergy
Drowned Catacomb
23%inclusion64 decks277 decks
-14%synergy
Floodfarm Verge
23%inclusion63 decks277 decks
12%synergy
Azorius Chancery
22%inclusion62 decks277 decks
8%synergy
Bloodstained Mire
22%inclusion62 decks277 decks
11%synergy
Prairie Stream
22%inclusion61 decks277 decks
-19%synergy
Tainted Isle
21%inclusion59 decks277 decks
15%synergy
Gloomlake Verge
21%inclusion59 decks277 decks
10%synergy
Dimir Aqueduct
21%inclusion57 decks277 decks
7%synergy
Sunken Hollow
21%inclusion57 decks277 decks
-19%synergy
Valgavoth's Lair
20%inclusion56 decks277 decks
17%synergy
Mana Confluence
20%inclusion56 decks277 decks
6%synergy
Misty Rainforest
20%inclusion55 decks277 decks
9%synergy
Windswept Heath
20%inclusion55 decks277 decks
10%synergy
Tainted Field
20%inclusion55 decks277 decks
13%synergy
Verdant Catacombs
20%inclusion55 decks277 decks
10%synergy
Orzhov Basilica
20%inclusion55 decks277 decks
4%synergy
Temple of Deceit
19%inclusion54 decks277 decks
2%synergy
Temple of Silence
19%inclusion54 decks277 decks
0%synergy
Temple of Enlightenment
19%inclusion54 decks277 decks
3%synergy
Sink into Stupor
19%inclusion52 decks277 decks
6%synergy
Scalding Tarn
18%inclusion51 decks277 decks
7%synergy
Arid Mesa
17%inclusion48 decks277 decks
8%synergy
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