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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Moonshadow
4.3%inclusion1 decks23 decks
4%synergy
Winnowing
3.4%inclusion1 decks29 decks
3%synergy
Mornsong Aria
3.4%inclusion1 decks29 decks
3%synergy
High Synergy Cards
Animate Dead
78%inclusion202 decks258 decks
69%synergy
Ripples of Undeath
67%inclusion172 decks258 decks
64%synergy
Necromancy
67%inclusion173 decks258 decks
62%synergy
Dress Down
62%inclusion160 decks258 decks
60%synergy
Abdel Adrian, Gorion's Ward
53%inclusion136 decks258 decks
51%synergy
Mystic Remora
72%inclusion186 decks258 decks
51%synergy
Entomb
57%inclusion147 decks258 decks
50%synergy
Inquisitive Glimmer
57%inclusion148 decks258 decks
50%synergy
Sevinne's Reclamation
57%inclusion148 decks258 decks
48%synergy
Entity Tracker
53%inclusion138 decks258 decks
47%synergy
Top Cards
Swords to Plowshares
63%inclusion162 decks258 decks
-5%synergy
Mesa Enchantress
53%inclusion136 decks258 decks
44%synergy
Mirrormade
50%inclusion130 decks258 decks
41%synergy
Blind Obedience
47%inclusion121 decks258 decks
35%synergy
Starfield Mystic
46%inclusion118 decks258 decks
39%synergy
Dance of the Dead
45%inclusion115 decks258 decks
42%synergy
Gravebreaker Lamia
44%inclusion114 decks258 decks
43%synergy
An Offer You Can't Refuse
43%inclusion112 decks258 decks
17%synergy
Dark Ritual
43%inclusion112 decks258 decks
24%synergy
Amphibian Downpour
42%inclusion108 decks258 decks
37%synergy
Game Changers
Rhystic Study
65%inclusion168 decks258 decks
33%synergy
Smothering Tithe
61%inclusion158 decks258 decks
29%synergy
Enlightened Tutor
51%inclusion131 decks258 decks
31%synergy
Demonic Tutor
46%inclusion119 decks258 decks
25%synergy
Vampiric Tutor
40%inclusion104 decks258 decks
23%synergy
Cyclonic Rift
33%inclusion84 decks258 decks
8%synergy
Thassa's Oracle
31%inclusion81 decks258 decks
22%synergy
Fierce Guardianship
31%inclusion79 decks258 decks
10%synergy
Ancient Tomb
29%inclusion75 decks258 decks
16%synergy
Necropotence
28%inclusion73 decks258 decks
22%synergy
Creatures
Scrabbling Skullcrab
41%inclusion106 decks258 decks
40%synergy
Demon of Fate's Design
41%inclusion106 decks258 decks
36%synergy
Overlord of the Balemurk
38%inclusion97 decks258 decks
36%synergy
Esper Sentinel
36%inclusion94 decks258 decks
9%synergy
Ondu Spiritdancer
36%inclusion92 decks258 decks
29%synergy
Overlord of the Floodpits
35%inclusion91 decks258 decks
32%synergy
Fear of Impostors
34%inclusion89 decks258 decks
33%synergy
Fear of Sleep Paralysis
34%inclusion89 decks258 decks
29%synergy
Doomwake Giant
34%inclusion88 decks258 decks
28%synergy
Zur, Eternal Schemer
30%inclusion78 decks258 decks
27%synergy
Grand Abolisher
29%inclusion75 decks258 decks
14%synergy
Lotho, Corrupt Shirriff
29%inclusion75 decks258 decks
12%synergy
Victor, Valgavoth's Seneschal
29%inclusion75 decks258 decks
27%synergy
Zur the Enchanter
24%inclusion61 decks258 decks
18%synergy
Hullbreaker Horror
23%inclusion60 decks258 decks
17%synergy
Grim Guardian
23%inclusion59 decks258 decks
20%synergy
Orcish Bowmasters
22%inclusion58 decks258 decks
12%synergy
Heliod, the Radiant Dawn
22%inclusion58 decks258 decks
19%synergy
Valley Floodcaller
21%inclusion54 decks258 decks
17%synergy
Moon-Blessed Cleric
20%inclusion52 decks258 decks
15%synergy
Displacer Kitten
20%inclusion51 decks258 decks
13%synergy
Ledger Shredder
19%inclusion50 decks258 decks
11%synergy
Ghostly Dancers
18%inclusion47 decks258 decks
16%synergy
Enduring Curiosity
18%inclusion46 decks258 decks
10%synergy
Silent Hallcreeper
17%inclusion44 decks258 decks
13%synergy
Soaring Lightbringer
17%inclusion43 decks258 decks
12%synergy
Lurrus of the Dream-Den
16%inclusion40 decks258 decks
14%synergy
Balemurk Leech
15%inclusion39 decks258 decks
14%synergy
Aminatou, Veil Piercer
15%inclusion38 decks258 decks
13%synergy
Opposition Agent
14%inclusion35 decks258 decks
5%synergy
Hedron Crab
13%inclusion34 decks258 decks
13%synergy
Archon of Sun's Grace
12%inclusion32 decks258 decks
8%synergy
Psychic Frog
12%inclusion31 decks258 decks
5%synergy
Ranger-Captain of Eos
12%inclusion31 decks258 decks
6%synergy
Talion, the Kindly Lord
12%inclusion30 decks258 decks
4%synergy
Gremlin Tamer
11%inclusion29 decks258 decks
10%synergy
Archetype of Imagination
11%inclusion29 decks258 decks
7%synergy
Drannith Magistrate
10%inclusion27 decks258 decks
2%synergy
Mindwrack Harpy
10%inclusion27 decks258 decks
10%synergy
Wan Shi Tong, Librarian
10%inclusion7 decks72 decks
4%synergy
Archivist of Oghma
10%inclusion25 decks258 decks
3%synergy
Voice of Victory
10%inclusion20 decks208 decks
1%synergy
Skullsnap Nuisance
9.3%inclusion24 decks258 decks
9%synergy
Ancient Cellarspawn
9.3%inclusion24 decks258 decks
6%synergy
Overlord of the Mistmoors
8.9%inclusion23 decks258 decks
7%synergy
Mockingbird
8.5%inclusion22 decks258 decks
4%synergy
Faerie Mastermind
8.5%inclusion22 decks258 decks
-1%synergy
Leonin Relic-Warder
8.1%inclusion21 decks258 decks
8%synergy
Athreos, Shroud-Veiled
8.1%inclusion21 decks258 decks
4%synergy
Laboratory Maniac
8.1%inclusion21 decks258 decks
5%synergy
Instants
Path to Exile
33%inclusion86 decks258 decks
-9%synergy
Swan Song
32%inclusion82 decks258 decks
12%synergy
Counterspell
30%inclusion78 decks258 decks
-11%synergy
Arcane Denial
29%inclusion75 decks258 decks
9%synergy
Mana Drain
28%inclusion73 decks258 decks
11%synergy
Silence
24%inclusion63 decks258 decks
14%synergy
Mystical Tutor
24%inclusion63 decks258 decks
13%synergy
Force of Will
23%inclusion60 decks258 decks
11%synergy
Flusterstorm
21%inclusion53 decks258 decks
12%synergy
Force of Negation
20%inclusion51 decks258 decks
8%synergy
Sink into Stupor
19%inclusion48 decks258 decks
6%synergy
Dovin's Veto
18%inclusion47 decks258 decks
-7%synergy
Gifts Ungiven
18%inclusion47 decks258 decks
16%synergy
Demonic Consultation
18%inclusion47 decks258 decks
10%synergy
Intuition
17%inclusion44 decks258 decks
15%synergy
Borne Upon a Wind
15%inclusion38 decks258 decks
10%synergy
Teferi's Protection
14%inclusion37 decks258 decks
-2%synergy
Cabal Ritual
14%inclusion37 decks258 decks
11%synergy
Tainted Pact
14%inclusion37 decks258 decks
7%synergy
Pact of Negation
14%inclusion35 decks258 decks
6%synergy
Frantic Search
13%inclusion34 decks258 decks
-4%synergy
Brainstorm
13%inclusion33 decks258 decks
-4%synergy
Inkshield
13%inclusion33 decks258 decks
3%synergy
Mindbreak Trap
12%inclusion31 decks258 decks
5%synergy
Void Rend
11%inclusion29 decks258 decks
-23%synergy
Thirst for Meaning
11%inclusion28 decks258 decks
9%synergy
Mental Misstep
10%inclusion26 decks258 decks
3%synergy
Otherworldly Gaze
10%inclusion26 decks258 decks
8%synergy
Into the Flood Maw
10%inclusion25 decks258 decks
6%synergy
Negate
8.1%inclusion21 decks258 decks
-8%synergy
Fell the Profane
7.8%inclusion20 decks258 decks
-1%synergy
Anguished Unmaking
7.8%inclusion20 decks258 decks
-17%synergy
Muddle the Mixture
7.4%inclusion19 decks258 decks
3%synergy
Deadly Rollick
6.6%inclusion17 decks258 decks
-8%synergy
Waterlogged Teachings
6.2%inclusion16 decks258 decks
2%synergy
Utter End
6.2%inclusion16 decks258 decks
-1%synergy
Chain of Vapor
5.8%inclusion15 decks258 decks
2%synergy
Delay
5.8%inclusion15 decks258 decks
4%synergy
Retraction Helix
5.4%inclusion14 decks258 decks
5%synergy
Brain Freeze
5.4%inclusion14 decks258 decks
5%synergy
Ad Nauseam
5.4%inclusion14 decks258 decks
3%synergy
Dispel
5.0%inclusion13 decks258 decks
1%synergy
Sorceries
Windfall
29%inclusion75 decks258 decks
15%synergy
Reanimate
28%inclusion73 decks258 decks
12%synergy
Redress Fate
24%inclusion63 decks258 decks
18%synergy
Toxic Deluge
22%inclusion57 decks258 decks
2%synergy
Demonic Counsel
14%inclusion36 decks258 decks
13%synergy
Singularity Rupture
13%inclusion16 decks125 decks
10%synergy
Damn
13%inclusion33 decks258 decks
-8%synergy
Lively Dirge
12%inclusion32 decks258 decks
11%synergy
Glimpse the Unthinkable
12%inclusion32 decks258 decks
12%synergy
Idyllic Tutor
12%inclusion31 decks258 decks
8%synergy
Unmarked Grave
11%inclusion29 decks258 decks
10%synergy
Supreme Verdict
10%inclusion27 decks258 decks
-4%synergy
Imperial Seal
10%inclusion27 decks258 decks
3%synergy
Extinguish All Hope
10%inclusion25 decks258 decks
8%synergy
Beseech the Mirror
8.9%inclusion23 decks258 decks
5%synergy
Replenish
8.5%inclusion22 decks258 decks
7%synergy
Dance of the Manse
8.1%inclusion21 decks258 decks
5%synergy
Buried Alive
7.4%inclusion19 decks258 decks
3%synergy
Time Wipe
7.4%inclusion19 decks258 decks
0%synergy
Farewell
7.0%inclusion18 decks258 decks
-6%synergy
Resurgent Belief
6.6%inclusion17 decks258 decks
4%synergy
Ponder
5.8%inclusion15 decks258 decks
-3%synergy
Terminus
5.0%inclusion13 decks258 decks
1%synergy
Utility Artifacts
The One Ring
26%inclusion66 decks258 decks
12%synergy
Mesmeric Orb
22%inclusion57 decks258 decks
21%synergy
Wishclaw Talisman
20%inclusion51 decks258 decks
12%synergy
Lightning Greaves
8.1%inclusion21 decks258 decks
-14%synergy
Sensei's Divining Top
6.6%inclusion17 decks258 decks
-3%synergy
Cloud Key
5.4%inclusion14 decks258 decks
2%synergy
Enchantments
Sphere of Safety
40%inclusion104 decks258 decks
31%synergy
Secret Arcade // Dusty Parlor
38%inclusion99 decks258 decks
33%synergy
Propaganda
36%inclusion94 decks258 decks
9%synergy
Ghostly Prison
33%inclusion85 decks258 decks
11%synergy
Grasp of Fate
31%inclusion81 decks258 decks
25%synergy
Seal of Cleansing
31%inclusion80 decks258 decks
30%synergy
The Meathook Massacre
30%inclusion77 decks258 decks
26%synergy
Tinybones Joins Up
29%inclusion76 decks258 decks
28%synergy
Starfield of Nyx
26%inclusion66 decks258 decks
22%synergy
Sigil of the Empty Throne
25%inclusion64 decks258 decks
19%synergy
Cemetery Tampering
25%inclusion64 decks258 decks
24%synergy
Estrid's Invocation
24%inclusion62 decks258 decks
19%synergy
Touch the Spirit Realm
21%inclusion55 decks258 decks
19%synergy
Static Prison
21%inclusion55 decks258 decks
21%synergy
Monologue Tax
21%inclusion53 decks258 decks
14%synergy
Greater Auramancy
20%inclusion52 decks258 decks
16%synergy
Darksteel Mutation
19%inclusion49 decks258 decks
13%synergy
Cacophony Unleashed
19%inclusion49 decks258 decks
17%synergy
Black Market Connections
18%inclusion46 decks258 decks
4%synergy
Seal of Removal
18%inclusion46 decks258 decks
17%synergy
Shark Typhoon
16%inclusion41 decks258 decks
10%synergy
Leyline of Anticipation
16%inclusion41 decks258 decks
11%synergy
Out of the Tombs
16%inclusion40 decks258 decks
15%synergy
Trouble in Pairs
15%inclusion38 decks258 decks
9%synergy
Extravagant Replication
15%inclusion38 decks258 decks
10%synergy
Phyrexian Arena
14%inclusion37 decks258 decks
0%synergy
Stillness in Motion
14%inclusion28 decks200 decks
14%synergy
Defiled Crypt // Cadaver Lab
14%inclusion35 decks258 decks
13%synergy
Timely Ward
13%inclusion34 decks258 decks
8%synergy
The Tale of Tamiyo
13%inclusion34 decks258 decks
13%synergy
Enchanted Evening
13%inclusion33 decks258 decks
11%synergy
Polluted Cistern // Dim Oubliette
12%inclusion31 decks258 decks
11%synergy
Authority of the Consuls
12%inclusion31 decks258 decks
0%synergy
Copy Enchantment
12%inclusion30 decks258 decks
7%synergy
Sheltered by Ghosts
11%inclusion29 decks258 decks
9%synergy
Mirror Room // Fractured Realm
11%inclusion29 decks258 decks
9%synergy
Land Tax
11%inclusion29 decks258 decks
5%synergy
Imprisoned in the Moon
11%inclusion28 decks258 decks
4%synergy
Aura of Silence
11%inclusion28 decks258 decks
8%synergy
The Eldest Reborn
10%inclusion27 decks258 decks
8%synergy
Bottomless Pool // Locker Room
10%inclusion26 decks258 decks
8%synergy
Restricted Office // Lecture Hall
10%inclusion26 decks258 decks
8%synergy
Teval's Judgment
10%inclusion20 decks205 decks
9%synergy
Hallowed Haunting
10%inclusion25 decks258 decks
7%synergy
One with the Multiverse
9.3%inclusion24 decks258 decks
5%synergy
Court of Cunning
9.3%inclusion24 decks258 decks
8%synergy
Central Elevator // Promising Stairs
9.3%inclusion24 decks258 decks
9%synergy
All That Glitters
8.9%inclusion23 decks258 decks
0%synergy
Oubliette
8.9%inclusion23 decks258 decks
7%synergy
Unable to Scream
8.9%inclusion23 decks258 decks
8%synergy
Planeswalkers
Teferi, Time Raveler
21%inclusion55 decks258 decks
13%synergy
Utility Lands
Hall of Heliod's Generosity
56%inclusion144 decks258 decks
43%synergy
Otawara, Soaring City
37%inclusion96 decks258 decks
18%synergy
Bojuka Bog
34%inclusion89 decks258 decks
7%synergy
Takenuma, Abandoned Mire
21%inclusion54 decks258 decks
14%synergy
Urza's Saga
19%inclusion48 decks258 decks
7%synergy
Serra's Sanctum
17%inclusion45 decks258 decks
16%synergy
Cephalid Coliseum
14%inclusion37 decks258 decks
11%synergy
Reliquary Tower
14%inclusion37 decks258 decks
-19%synergy
Urborg, Tomb of Yawgmoth
14%inclusion37 decks258 decks
1%synergy
Emergence Zone
12%inclusion32 decks258 decks
10%synergy
Halimar Depths
10%inclusion26 decks258 decks
5%synergy
Minamo, School at Water's Edge
7.4%inclusion19 decks258 decks
3%synergy
Rogue's Passage
5.8%inclusion15 decks258 decks
-4%synergy
Eiganjo, Seat of the Empire
5.4%inclusion14 decks258 decks
0%synergy
Cabal Coffers
5.0%inclusion13 decks258 decks
2%synergy
Mana Artifacts
Sol Ring
93%inclusion241 decks258 decks
3%synergy
Arcane Signet
92%inclusion237 decks258 decks
4%synergy
Talisman of Dominance
56%inclusion144 decks258 decks
6%synergy
Talisman of Progress
50%inclusion129 decks258 decks
7%synergy
Talisman of Hierarchy
50%inclusion129 decks258 decks
6%synergy
Fellwar Stone
42%inclusion109 decks258 decks
8%synergy
Azorius Signet
35%inclusion91 decks258 decks
3%synergy
Orzhov Signet
32%inclusion83 decks258 decks
-2%synergy
Lotus Petal
24%inclusion61 decks258 decks
13%synergy
Mana Vault
23%inclusion59 decks258 decks
14%synergy
Dimir Signet
23%inclusion59 decks258 decks
-9%synergy
Chrome Mox
20%inclusion51 decks258 decks
10%synergy
Mind Stone
12%inclusion32 decks258 decks
0%synergy
Mox Opal
12%inclusion31 decks258 decks
3%synergy
Mox Amber
11%inclusion28 decks258 decks
5%synergy
Mox Diamond
10%inclusion27 decks258 decks
3%synergy
Lion's Eye Diamond
9.3%inclusion24 decks258 decks
7%synergy
Commander's Sphere
8.5%inclusion22 decks258 decks
-10%synergy
Thought Vessel
7.4%inclusion19 decks258 decks
-17%synergy
Basalt Monolith
5.0%inclusion13 decks258 decks
3%synergy
Lands
Command Tower
95%inclusion244 decks258 decks
2%synergy
Island
91%inclusion234 decks258 decks
-2%synergy
Swamp
90%inclusion233 decks258 decks
-1%synergy
Plains
90%inclusion231 decks258 decks
-2%synergy
Watery Grave
65%inclusion167 decks258 decks
15%synergy
Hallowed Fountain
64%inclusion166 decks258 decks
15%synergy
Godless Shrine
64%inclusion164 decks258 decks
13%synergy
Flooded Strand
60%inclusion154 decks258 decks
22%synergy
Polluted Delta
59%inclusion153 decks258 decks
22%synergy
Marsh Flats
56%inclusion145 decks258 decks
20%synergy
Exotic Orchard
51%inclusion132 decks258 decks
-7%synergy
Raffine's Tower
50%inclusion128 decks258 decks
9%synergy
Caves of Koilos
47%inclusion120 decks258 decks
11%synergy
Adarkar Wastes
45%inclusion116 decks258 decks
14%synergy
Sea of Clouds
45%inclusion116 decks258 decks
9%synergy
Underground River
45%inclusion115 decks258 decks
11%synergy
Morphic Pool
42%inclusion109 decks258 decks
8%synergy
Undercity Sewers
42%inclusion108 decks258 decks
28%synergy
Arcane Sanctum
42%inclusion108 decks258 decks
-13%synergy
Vault of Champions
42%inclusion108 decks258 decks
9%synergy
Shadowy Backstreet
36%inclusion92 decks258 decks
23%synergy
Meticulous Archive
35%inclusion91 decks258 decks
22%synergy
Glacial Fortress
35%inclusion90 decks258 decks
-6%synergy
Isolated Chapel
30%inclusion78 decks258 decks
-9%synergy
Tundra
26%inclusion66 decks258 decks
10%synergy
City of Brass
25%inclusion65 decks258 decks
10%synergy
Underground Sea
24%inclusion63 decks258 decks
9%synergy
Scrubland
24%inclusion63 decks258 decks
8%synergy
Drowned Catacomb
23%inclusion59 decks258 decks
-13%synergy
Prairie Stream
22%inclusion58 decks258 decks
-18%synergy
Azorius Chancery
22%inclusion58 decks258 decks
8%synergy
Floodfarm Verge
22%inclusion58 decks258 decks
11%synergy
Bloodstained Mire
22%inclusion56 decks258 decks
11%synergy
Gloomlake Verge
22%inclusion56 decks258 decks
11%synergy
Dimir Aqueduct
21%inclusion54 decks258 decks
7%synergy
Tainted Isle
21%inclusion54 decks258 decks
15%synergy
Sunken Hollow
21%inclusion53 decks258 decks
-19%synergy
Orzhov Basilica
21%inclusion53 decks258 decks
5%synergy
Misty Rainforest
20%inclusion52 decks258 decks
9%synergy
Mana Confluence
20%inclusion52 decks258 decks
6%synergy
Valgavoth's Lair
20%inclusion51 decks258 decks
17%synergy
Windswept Heath
19%inclusion50 decks258 decks
10%synergy
Verdant Catacombs
19%inclusion50 decks258 decks
9%synergy
Tainted Field
19%inclusion50 decks258 decks
12%synergy
Temple of Enlightenment
19%inclusion49 decks258 decks
2%synergy
Scalding Tarn
19%inclusion49 decks258 decks
8%synergy
Temple of Silence
19%inclusion49 decks258 decks
0%synergy
Temple of Deceit
19%inclusion49 decks258 decks
1%synergy
Sink into Stupor
19%inclusion48 decks258 decks
6%synergy
Terramorphic Expanse
17%inclusion44 decks258 decks
1%synergy
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