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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Enchantments
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Utility Lands
Mana Artifacts
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Wan Shi Tong, Librarian
13%inclusion7 decks55 decks
8%synergy
Bender's Waterskin
2.1%inclusion2 decks96 decks
-1%synergy
Benevolent River Spirit
2.1%inclusion1 decks48 decks
2%synergy
Dutiful Knowledge Seeker
2.1%inclusion1 decks48 decks
2%synergy
Koh, the Face Stealer
2.1%inclusion1 decks48 decks
2%synergy
High Synergy Cards
Animate Dead
77%inclusion193 decks250 decks
67%synergy
Ripples of Undeath
67%inclusion168 decks250 decks
64%synergy
Necromancy
68%inclusion171 decks250 decks
64%synergy
Dress Down
62%inclusion155 decks250 decks
59%synergy
Abdel Adrian, Gorion's Ward
52%inclusion130 decks250 decks
50%synergy
Mystic Remora
71%inclusion178 decks250 decks
50%synergy
Inquisitive Glimmer
57%inclusion143 decks250 decks
50%synergy
Entomb
56%inclusion139 decks250 decks
49%synergy
Sevinne's Reclamation
56%inclusion141 decks250 decks
48%synergy
Entity Tracker
54%inclusion135 decks250 decks
47%synergy
Top Cards
Swords to Plowshares
62%inclusion155 decks250 decks
-6%synergy
Mesa Enchantress
53%inclusion133 decks250 decks
44%synergy
Mirrormade
50%inclusion125 decks250 decks
40%synergy
Blind Obedience
48%inclusion119 decks250 decks
35%synergy
Starfield Mystic
45%inclusion113 decks250 decks
38%synergy
Dark Ritual
44%inclusion110 decks250 decks
25%synergy
Gravebreaker Lamia
44%inclusion110 decks250 decks
43%synergy
Dance of the Dead
44%inclusion109 decks250 decks
41%synergy
Amphibian Downpour
43%inclusion107 decks250 decks
38%synergy
An Offer You Can't Refuse
42%inclusion106 decks250 decks
16%synergy
Game Changers
Rhystic Study
66%inclusion164 decks250 decks
33%synergy
Smothering Tithe
62%inclusion155 decks250 decks
30%synergy
Enlightened Tutor
51%inclusion128 decks250 decks
31%synergy
Demonic Tutor
46%inclusion115 decks250 decks
25%synergy
Vampiric Tutor
40%inclusion99 decks250 decks
22%synergy
Cyclonic Rift
34%inclusion84 decks250 decks
9%synergy
Fierce Guardianship
31%inclusion78 decks250 decks
11%synergy
Thassa's Oracle
31%inclusion78 decks250 decks
21%synergy
Ancient Tomb
30%inclusion76 decks250 decks
17%synergy
Necropotence
28%inclusion69 decks250 decks
21%synergy
Creatures
Demon of Fate's Design
42%inclusion105 decks250 decks
36%synergy
Scrabbling Skullcrab
40%inclusion101 decks250 decks
39%synergy
Overlord of the Balemurk
37%inclusion93 decks250 decks
35%synergy
Esper Sentinel
37%inclusion93 decks250 decks
9%synergy
Overlord of the Floodpits
36%inclusion91 decks250 decks
33%synergy
Ondu Spiritdancer
36%inclusion90 decks250 decks
30%synergy
Fear of Impostors
36%inclusion89 decks250 decks
34%synergy
Fear of Sleep Paralysis
34%inclusion86 decks250 decks
29%synergy
Doomwake Giant
34%inclusion86 decks250 decks
28%synergy
Zur, Eternal Schemer
30%inclusion76 decks250 decks
27%synergy
Victor, Valgavoth's Seneschal
30%inclusion74 decks250 decks
28%synergy
Grand Abolisher
29%inclusion72 decks250 decks
14%synergy
Lotho, Corrupt Shirriff
28%inclusion71 decks250 decks
12%synergy
Zur the Enchanter
24%inclusion60 decks250 decks
19%synergy
Orcish Bowmasters
23%inclusion58 decks250 decks
12%synergy
Hullbreaker Horror
23%inclusion57 decks250 decks
17%synergy
Heliod, the Radiant Dawn
22%inclusion56 decks250 decks
19%synergy
Grim Guardian
22%inclusion55 decks250 decks
19%synergy
Valley Floodcaller
21%inclusion52 decks250 decks
17%synergy
Ledger Shredder
21%inclusion52 decks250 decks
12%synergy
Displacer Kitten
20%inclusion50 decks250 decks
13%synergy
Moon-Blessed Cleric
19%inclusion48 decks250 decks
14%synergy
Ghostly Dancers
18%inclusion46 decks250 decks
16%synergy
Enduring Curiosity
18%inclusion45 decks250 decks
10%synergy
Silent Hallcreeper
17%inclusion43 decks250 decks
13%synergy
Soaring Lightbringer
17%inclusion43 decks250 decks
12%synergy
Lurrus of the Dream-Den
16%inclusion39 decks250 decks
14%synergy
Balemurk Leech
15%inclusion38 decks250 decks
14%synergy
Hedron Crab
14%inclusion36 decks250 decks
14%synergy
Aminatou, Veil Piercer
14%inclusion36 decks250 decks
13%synergy
Opposition Agent
14%inclusion34 decks250 decks
5%synergy
Ranger-Captain of Eos
12%inclusion31 decks250 decks
6%synergy
Psychic Frog
12%inclusion30 decks250 decks
5%synergy
Archon of Sun's Grace
12%inclusion29 decks250 decks
7%synergy
Talion, the Kindly Lord
12%inclusion29 decks250 decks
3%synergy
Gremlin Tamer
12%inclusion29 decks250 decks
11%synergy
Archetype of Imagination
11%inclusion27 decks250 decks
6%synergy
Drannith Magistrate
10%inclusion26 decks250 decks
2%synergy
Mindwrack Harpy
10%inclusion26 decks250 decks
10%synergy
Archivist of Oghma
10%inclusion25 decks250 decks
3%synergy
Overlord of the Mistmoors
10%inclusion24 decks250 decks
7%synergy
Athreos, Shroud-Veiled
8.8%inclusion22 decks250 decks
4%synergy
Skullsnap Nuisance
8.8%inclusion22 decks250 decks
8%synergy
Faerie Mastermind
8.8%inclusion22 decks250 decks
-1%synergy
Ancient Cellarspawn
8.8%inclusion22 decks250 decks
5%synergy
Voice of Victory
8.5%inclusion17 decks199 decks
0%synergy
Mockingbird
8.4%inclusion21 decks250 decks
4%synergy
Laboratory Maniac
8.0%inclusion20 decks250 decks
5%synergy
Nightmare Shepherd
7.6%inclusion19 decks250 decks
5%synergy
Phyrexian Metamorph
7.6%inclusion19 decks250 decks
-1%synergy
Instants
Path to Exile
34%inclusion84 decks250 decks
-8%synergy
Swan Song
31%inclusion78 decks250 decks
12%synergy
Counterspell
30%inclusion74 decks250 decks
-12%synergy
Arcane Denial
29%inclusion73 decks250 decks
9%synergy
Mana Drain
28%inclusion71 decks250 decks
11%synergy
Mystical Tutor
24%inclusion61 decks250 decks
13%synergy
Force of Will
24%inclusion61 decks250 decks
12%synergy
Silence
24%inclusion60 decks250 decks
14%synergy
Force of Negation
20%inclusion51 decks250 decks
9%synergy
Flusterstorm
20%inclusion49 decks250 decks
11%synergy
Sink into Stupor
19%inclusion47 decks250 decks
6%synergy
Dovin's Veto
18%inclusion46 decks250 decks
-6%synergy
Demonic Consultation
18%inclusion45 decks250 decks
10%synergy
Gifts Ungiven
18%inclusion44 decks250 decks
15%synergy
Intuition
18%inclusion44 decks250 decks
16%synergy
Teferi's Protection
15%inclusion37 decks250 decks
-2%synergy
Borne Upon a Wind
15%inclusion37 decks250 decks
10%synergy
Tainted Pact
14%inclusion36 decks250 decks
7%synergy
Cabal Ritual
14%inclusion35 decks250 decks
11%synergy
Pact of Negation
14%inclusion35 decks250 decks
6%synergy
Inkshield
14%inclusion34 decks250 decks
4%synergy
Frantic Search
13%inclusion33 decks250 decks
-4%synergy
Brainstorm
13%inclusion33 decks250 decks
-4%synergy
Mindbreak Trap
12%inclusion29 decks250 decks
5%synergy
Thirst for Meaning
11%inclusion28 decks250 decks
10%synergy
Void Rend
11%inclusion28 decks250 decks
-22%synergy
Mental Misstep
10%inclusion26 decks250 decks
3%synergy
Otherworldly Gaze
10%inclusion25 decks250 decks
8%synergy
Into the Flood Maw
9.2%inclusion23 decks250 decks
5%synergy
Fell the Profane
7.6%inclusion19 decks250 decks
-1%synergy
Negate
7.6%inclusion19 decks250 decks
-9%synergy
Anguished Unmaking
7.6%inclusion19 decks250 decks
-17%synergy
Muddle the Mixture
6.8%inclusion17 decks250 decks
3%synergy
Deadly Rollick
6.8%inclusion17 decks250 decks
-7%synergy
Utter End
6.4%inclusion16 decks250 decks
-1%synergy
Chain of Vapor
6.0%inclusion15 decks250 decks
3%synergy
Waterlogged Teachings
6.0%inclusion15 decks250 decks
2%synergy
Delay
5.6%inclusion14 decks250 decks
3%synergy
Retraction Helix
5.6%inclusion14 decks250 decks
5%synergy
Ad Nauseam
5.6%inclusion14 decks250 decks
3%synergy
Brain Freeze
5.2%inclusion13 decks250 decks
5%synergy
Dispel
5.2%inclusion13 decks250 decks
2%synergy
Sorceries
Windfall
29%inclusion73 decks250 decks
15%synergy
Reanimate
26%inclusion66 decks250 decks
11%synergy
Redress Fate
24%inclusion61 decks250 decks
18%synergy
Toxic Deluge
22%inclusion54 decks250 decks
2%synergy
Singularity Rupture
15%inclusion17 decks113 decks
13%synergy
Demonic Counsel
13%inclusion33 decks250 decks
12%synergy
Lively Dirge
12%inclusion31 decks250 decks
11%synergy
Damn
12%inclusion30 decks250 decks
-8%synergy
Idyllic Tutor
12%inclusion29 decks250 decks
7%synergy
Glimpse the Unthinkable
12%inclusion29 decks250 decks
11%synergy
Imperial Seal
11%inclusion28 decks250 decks
4%synergy
Supreme Verdict
11%inclusion28 decks250 decks
-4%synergy
Extinguish All Hope
10%inclusion26 decks250 decks
9%synergy
Unmarked Grave
10%inclusion24 decks250 decks
8%synergy
Beseech the Mirror
8.8%inclusion22 decks250 decks
5%synergy
Replenish
8.4%inclusion21 decks250 decks
7%synergy
Dance of the Manse
8.4%inclusion21 decks250 decks
5%synergy
Time Wipe
7.2%inclusion18 decks250 decks
0%synergy
Buried Alive
7.2%inclusion18 decks250 decks
3%synergy
Resurgent Belief
6.8%inclusion17 decks250 decks
5%synergy
Farewell
6.4%inclusion16 decks250 decks
-7%synergy
Ponder
6.0%inclusion15 decks250 decks
-3%synergy
Terminus
5.6%inclusion14 decks250 decks
1%synergy
Utility Artifacts
The One Ring
26%inclusion65 decks250 decks
12%synergy
Mesmeric Orb
20%inclusion51 decks250 decks
19%synergy
Wishclaw Talisman
20%inclusion49 decks250 decks
11%synergy
Lightning Greaves
8.0%inclusion20 decks250 decks
-14%synergy
Sensei's Divining Top
6.8%inclusion17 decks250 decks
-3%synergy
Cloud Key
5.6%inclusion14 decks250 decks
2%synergy
Enchantments
Sphere of Safety
41%inclusion103 decks250 decks
32%synergy
Secret Arcade // Dusty Parlor
39%inclusion97 decks250 decks
34%synergy
Propaganda
38%inclusion95 decks250 decks
12%synergy
Ghostly Prison
34%inclusion85 decks250 decks
12%synergy
Seal of Cleansing
32%inclusion79 decks250 decks
30%synergy
Grasp of Fate
31%inclusion77 decks250 decks
25%synergy
The Meathook Massacre
30%inclusion74 decks250 decks
26%synergy
Tinybones Joins Up
29%inclusion73 decks250 decks
28%synergy
Starfield of Nyx
26%inclusion65 decks250 decks
22%synergy
Sigil of the Empty Throne
26%inclusion65 decks250 decks
20%synergy
Cemetery Tampering
24%inclusion60 decks250 decks
23%synergy
Estrid's Invocation
24%inclusion59 decks250 decks
19%synergy
Static Prison
21%inclusion53 decks250 decks
21%synergy
Touch the Spirit Realm
21%inclusion52 decks250 decks
18%synergy
Monologue Tax
20%inclusion50 decks250 decks
14%synergy
Greater Auramancy
20%inclusion50 decks250 decks
16%synergy
Cacophony Unleashed
20%inclusion49 decks250 decks
18%synergy
Darksteel Mutation
19%inclusion47 decks250 decks
12%synergy
Black Market Connections
18%inclusion44 decks250 decks
4%synergy
Seal of Removal
18%inclusion44 decks250 decks
17%synergy
Shark Typhoon
17%inclusion42 decks250 decks
11%synergy
Out of the Tombs
16%inclusion40 decks250 decks
16%synergy
Leyline of Anticipation
16%inclusion39 decks250 decks
11%synergy
Extravagant Replication
16%inclusion39 decks250 decks
11%synergy
Trouble in Pairs
15%inclusion38 decks250 decks
10%synergy
Phyrexian Arena
14%inclusion36 decks250 decks
0%synergy
Defiled Crypt // Cadaver Lab
14%inclusion35 decks250 decks
13%synergy
The Tale of Tamiyo
14%inclusion35 decks250 decks
14%synergy
Stillness in Motion
14%inclusion26 decks191 decks
13%synergy
Timely Ward
14%inclusion34 decks250 decks
9%synergy
Authority of the Consuls
12%inclusion31 decks250 decks
1%synergy
Polluted Cistern // Dim Oubliette
12%inclusion31 decks250 decks
12%synergy
Land Tax
12%inclusion30 decks250 decks
6%synergy
Enchanted Evening
12%inclusion29 decks250 decks
10%synergy
Sheltered by Ghosts
12%inclusion29 decks250 decks
9%synergy
Aura of Silence
12%inclusion29 decks250 decks
8%synergy
Imprisoned in the Moon
12%inclusion29 decks250 decks
5%synergy
Mirror Room // Fractured Realm
11%inclusion28 decks250 decks
9%synergy
Restricted Office // Lecture Hall
11%inclusion27 decks250 decks
9%synergy
Hallowed Haunting
11%inclusion27 decks250 decks
8%synergy
Copy Enchantment
11%inclusion27 decks250 decks
6%synergy
Bottomless Pool // Locker Room
11%inclusion27 decks250 decks
9%synergy
The Eldest Reborn
10%inclusion26 decks250 decks
8%synergy
Teval's Judgment
10%inclusion20 decks196 decks
9%synergy
Ethereal Armor
10%inclusion24 decks250 decks
5%synergy
Court of Cunning
10%inclusion24 decks250 decks
9%synergy
One with the Multiverse
10%inclusion24 decks250 decks
5%synergy
Oubliette
10%inclusion24 decks250 decks
8%synergy
Central Elevator // Promising Stairs
9.2%inclusion23 decks250 decks
9%synergy
Nowhere to Run
8.8%inclusion22 decks250 decks
8%synergy
Planeswalkers
Teferi, Time Raveler
21%inclusion53 decks250 decks
13%synergy
Utility Lands
Hall of Heliod's Generosity
56%inclusion141 decks250 decks
43%synergy
Otawara, Soaring City
36%inclusion91 decks250 decks
17%synergy
Bojuka Bog
35%inclusion88 decks250 decks
8%synergy
Takenuma, Abandoned Mire
20%inclusion49 decks250 decks
13%synergy
Urza's Saga
19%inclusion47 decks250 decks
7%synergy
Serra's Sanctum
18%inclusion44 decks250 decks
16%synergy
Urborg, Tomb of Yawgmoth
14%inclusion36 decks250 decks
1%synergy
Cephalid Coliseum
14%inclusion35 decks250 decks
10%synergy
Reliquary Tower
14%inclusion35 decks250 decks
-20%synergy
Emergence Zone
12%inclusion31 decks250 decks
10%synergy
Halimar Depths
10%inclusion26 decks250 decks
6%synergy
Minamo, School at Water's Edge
7.2%inclusion18 decks250 decks
3%synergy
Eiganjo, Seat of the Empire
5.6%inclusion14 decks250 decks
0%synergy
Rogue's Passage
5.2%inclusion13 decks250 decks
-4%synergy
Cabal Coffers
5.2%inclusion13 decks250 decks
2%synergy
Mana Artifacts
Sol Ring
93%inclusion232 decks250 decks
3%synergy
Arcane Signet
92%inclusion229 decks250 decks
4%synergy
Talisman of Dominance
57%inclusion142 decks250 decks
8%synergy
Talisman of Progress
51%inclusion127 decks250 decks
8%synergy
Talisman of Hierarchy
50%inclusion124 decks250 decks
6%synergy
Fellwar Stone
42%inclusion105 decks250 decks
8%synergy
Azorius Signet
36%inclusion89 decks250 decks
3%synergy
Orzhov Signet
31%inclusion78 decks250 decks
-3%synergy
Mana Vault
24%inclusion59 decks250 decks
14%synergy
Dimir Signet
23%inclusion58 decks250 decks
-9%synergy
Lotus Petal
23%inclusion58 decks250 decks
12%synergy
Chrome Mox
20%inclusion49 decks250 decks
10%synergy
Mind Stone
13%inclusion33 decks250 decks
0%synergy
Mox Diamond
11%inclusion28 decks250 decks
4%synergy
Mox Opal
11%inclusion28 decks250 decks
2%synergy
Lion's Eye Diamond
10%inclusion25 decks250 decks
8%synergy
Mox Amber
10%inclusion25 decks250 decks
4%synergy
Commander's Sphere
8.0%inclusion20 decks250 decks
-11%synergy
Thought Vessel
7.6%inclusion19 decks250 decks
-17%synergy
Basalt Monolith
5.2%inclusion13 decks250 decks
3%synergy
Lands
Command Tower
95%inclusion238 decks250 decks
3%synergy
Island
90%inclusion226 decks250 decks
-2%synergy
Swamp
90%inclusion225 decks250 decks
-1%synergy
Plains
89%inclusion223 decks250 decks
-2%synergy
Watery Grave
65%inclusion162 decks250 decks
15%synergy
Hallowed Fountain
64%inclusion160 decks250 decks
15%synergy
Godless Shrine
63%inclusion157 decks250 decks
13%synergy
Polluted Delta
59%inclusion148 decks250 decks
22%synergy
Flooded Strand
59%inclusion147 decks250 decks
21%synergy
Marsh Flats
56%inclusion139 decks250 decks
20%synergy
Exotic Orchard
52%inclusion129 decks250 decks
-7%synergy
Raffine's Tower
49%inclusion123 decks250 decks
8%synergy
Caves of Koilos
46%inclusion116 decks250 decks
11%synergy
Adarkar Wastes
45%inclusion113 decks250 decks
15%synergy
Underground River
45%inclusion112 decks250 decks
12%synergy
Sea of Clouds
44%inclusion111 decks250 decks
9%synergy
Arcane Sanctum
43%inclusion108 decks250 decks
-11%synergy
Morphic Pool
42%inclusion106 decks250 decks
8%synergy
Vault of Champions
41%inclusion103 decks250 decks
8%synergy
Undercity Sewers
40%inclusion99 decks250 decks
26%synergy
Meticulous Archive
35%inclusion88 decks250 decks
22%synergy
Glacial Fortress
35%inclusion88 decks250 decks
-4%synergy
Shadowy Backstreet
35%inclusion88 decks250 decks
23%synergy
Isolated Chapel
31%inclusion77 decks250 decks
-8%synergy
Tundra
26%inclusion64 decks250 decks
10%synergy
City of Brass
25%inclusion62 decks250 decks
10%synergy
Underground Sea
24%inclusion61 decks250 decks
9%synergy
Drowned Catacomb
24%inclusion61 decks250 decks
-11%synergy
Scrubland
24%inclusion61 decks250 decks
8%synergy
Azorius Chancery
23%inclusion58 decks250 decks
9%synergy
Prairie Stream
23%inclusion57 decks250 decks
-18%synergy
Floodfarm Verge
22%inclusion56 decks250 decks
11%synergy
Bloodstained Mire
22%inclusion54 decks250 decks
11%synergy
Gloomlake Verge
22%inclusion54 decks250 decks
11%synergy
Dimir Aqueduct
21%inclusion53 decks250 decks
7%synergy
Orzhov Basilica
21%inclusion52 decks250 decks
5%synergy
Sunken Hollow
21%inclusion52 decks250 decks
-19%synergy
Valgavoth's Lair
20%inclusion51 decks250 decks
17%synergy
Mana Confluence
20%inclusion51 decks250 decks
7%synergy
Tainted Isle
20%inclusion51 decks250 decks
14%synergy
Misty Rainforest
20%inclusion50 decks250 decks
9%synergy
Temple of Deceit
20%inclusion49 decks250 decks
1%synergy
Windswept Heath
19%inclusion48 decks250 decks
9%synergy
Temple of Silence
19%inclusion48 decks250 decks
-1%synergy
Tainted Field
19%inclusion48 decks250 decks
12%synergy
Verdant Catacombs
19%inclusion47 decks250 decks
8%synergy
Sink into Stupor
19%inclusion47 decks250 decks
6%synergy
Temple of Enlightenment
19%inclusion47 decks250 decks
2%synergy
Scalding Tarn
18%inclusion46 decks250 decks
7%synergy
Terramorphic Expanse
18%inclusion45 decks250 decks
1%synergy
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