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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Wan Shi Tong, Librarian
14%inclusion5 decks35 decks
10%synergy
The Legend of Kuruk
2.9%inclusion1 decks34 decks
3%synergy
Honest Work
2.9%inclusion1 decks35 decks
3%synergy
Bender's Waterskin
1.2%inclusion1 decks82 decks
-1%synergy
Appa, Steadfast Guardian
1.2%inclusion1 decks84 decks
1%synergy
High Synergy Cards
Animate Dead
78%inclusion186 decks238 decks
68%synergy
Necromancy
68%inclusion163 decks238 decks
64%synergy
Ripples of Undeath
66%inclusion156 decks238 decks
63%synergy
Dress Down
63%inclusion151 decks238 decks
61%synergy
Abdel Adrian, Gorion's Ward
53%inclusion125 decks238 decks
51%synergy
Entomb
56%inclusion134 decks238 decks
49%synergy
Mystic Remora
71%inclusion168 decks238 decks
49%synergy
Inquisitive Glimmer
57%inclusion135 decks238 decks
49%synergy
Sevinne's Reclamation
58%inclusion137 decks238 decks
49%synergy
Entity Tracker
53%inclusion125 decks238 decks
46%synergy
Top Cards
Swords to Plowshares
62%inclusion148 decks238 decks
-6%synergy
Mesa Enchantress
53%inclusion125 decks238 decks
43%synergy
Mirrormade
51%inclusion121 decks238 decks
41%synergy
Blind Obedience
48%inclusion114 decks238 decks
35%synergy
Starfield Mystic
47%inclusion112 decks238 decks
40%synergy
Dance of the Dead
45%inclusion106 decks238 decks
42%synergy
Gravebreaker Lamia
44%inclusion105 decks238 decks
43%synergy
Dark Ritual
44%inclusion105 decks238 decks
25%synergy
Amphibian Downpour
44%inclusion104 decks238 decks
39%synergy
An Offer You Can't Refuse
42%inclusion101 decks238 decks
16%synergy
Game Changers
Rhystic Study
66%inclusion157 decks238 decks
33%synergy
Smothering Tithe
63%inclusion150 decks238 decks
31%synergy
Enlightened Tutor
51%inclusion122 decks238 decks
31%synergy
Demonic Tutor
46%inclusion110 decks238 decks
25%synergy
Vampiric Tutor
40%inclusion96 decks238 decks
22%synergy
Cyclonic Rift
34%inclusion80 decks238 decks
9%synergy
Thassa's Oracle
32%inclusion77 decks238 decks
22%synergy
Fierce Guardianship
32%inclusion75 decks238 decks
11%synergy
Ancient Tomb
31%inclusion73 decks238 decks
17%synergy
Necropotence
28%inclusion67 decks238 decks
21%synergy
Creatures
Demon of Fate's Design
42%inclusion100 decks238 decks
36%synergy
Scrabbling Skullcrab
41%inclusion98 decks238 decks
40%synergy
Esper Sentinel
38%inclusion90 decks238 decks
10%synergy
Overlord of the Balemurk
37%inclusion88 decks238 decks
35%synergy
Overlord of the Floodpits
37%inclusion87 decks238 decks
33%synergy
Ondu Spiritdancer
36%inclusion86 decks238 decks
30%synergy
Doomwake Giant
35%inclusion83 decks238 decks
29%synergy
Fear of Impostors
34%inclusion82 decks238 decks
33%synergy
Fear of Sleep Paralysis
34%inclusion82 decks238 decks
29%synergy
Victor, Valgavoth's Seneschal
30%inclusion72 decks238 decks
28%synergy
Zur, Eternal Schemer
30%inclusion71 decks238 decks
27%synergy
Grand Abolisher
29%inclusion70 decks238 decks
15%synergy
Lotho, Corrupt Shirriff
29%inclusion69 decks238 decks
12%synergy
Zur the Enchanter
24%inclusion58 decks238 decks
19%synergy
Orcish Bowmasters
24%inclusion57 decks238 decks
13%synergy
Hullbreaker Horror
23%inclusion54 decks238 decks
17%synergy
Heliod, the Radiant Dawn
23%inclusion54 decks238 decks
19%synergy
Grim Guardian
21%inclusion51 decks238 decks
19%synergy
Valley Floodcaller
21%inclusion49 decks238 decks
16%synergy
Displacer Kitten
20%inclusion47 decks238 decks
12%synergy
Ledger Shredder
20%inclusion47 decks238 decks
11%synergy
Moon-Blessed Cleric
19%inclusion46 decks238 decks
15%synergy
Soaring Lightbringer
18%inclusion43 decks238 decks
13%synergy
Enduring Curiosity
18%inclusion43 decks238 decks
11%synergy
Silent Hallcreeper
17%inclusion41 decks238 decks
13%synergy
Ghostly Dancers
17%inclusion41 decks238 decks
14%synergy
Lurrus of the Dream-Den
15%inclusion35 decks238 decks
13%synergy
Balemurk Leech
15%inclusion35 decks238 decks
14%synergy
Opposition Agent
14%inclusion34 decks238 decks
5%synergy
Aminatou, Veil Piercer
14%inclusion33 decks238 decks
12%synergy
Hedron Crab
13%inclusion30 decks238 decks
12%synergy
Ranger-Captain of Eos
12%inclusion29 decks238 decks
6%synergy
Psychic Frog
12%inclusion29 decks238 decks
5%synergy
Talion, the Kindly Lord
11%inclusion27 decks238 decks
3%synergy
Archetype of Imagination
11%inclusion27 decks238 decks
7%synergy
Drannith Magistrate
11%inclusion27 decks238 decks
3%synergy
Archon of Sun's Grace
11%inclusion26 decks238 decks
6%synergy
Mindwrack Harpy
11%inclusion25 decks238 decks
10%synergy
Archivist of Oghma
10%inclusion24 decks238 decks
3%synergy
Gremlin Tamer
10%inclusion24 decks238 decks
9%synergy
Overlord of the Mistmoors
10%inclusion23 decks238 decks
7%synergy
Ancient Cellarspawn
9.2%inclusion22 decks238 decks
6%synergy
Athreos, Shroud-Veiled
9.2%inclusion22 decks238 decks
5%synergy
Faerie Mastermind
9.2%inclusion22 decks238 decks
0%synergy
Skullsnap Nuisance
8.8%inclusion21 decks238 decks
8%synergy
Voice of Victory
8.6%inclusion16 decks187 decks
0%synergy
Mockingbird
8.4%inclusion20 decks238 decks
4%synergy
Nightmare Shepherd
8.0%inclusion19 decks238 decks
5%synergy
Spirited Companion
8.0%inclusion19 decks238 decks
6%synergy
Phyrexian Metamorph
7.6%inclusion18 decks238 decks
-1%synergy
Instants
Swan Song
32%inclusion76 decks238 decks
13%synergy
Path to Exile
32%inclusion76 decks238 decks
-10%synergy
Counterspell
29%inclusion68 decks238 decks
-13%synergy
Mana Drain
28%inclusion67 decks238 decks
11%synergy
Arcane Denial
28%inclusion67 decks238 decks
8%synergy
Force of Will
25%inclusion60 decks238 decks
12%synergy
Mystical Tutor
25%inclusion60 decks238 decks
13%synergy
Silence
24%inclusion57 decks238 decks
14%synergy
Force of Negation
20%inclusion48 decks238 decks
8%synergy
Flusterstorm
20%inclusion47 decks238 decks
11%synergy
Demonic Consultation
19%inclusion46 decks238 decks
11%synergy
Dovin's Veto
18%inclusion44 decks238 decks
-6%synergy
Sink into Stupor
18%inclusion44 decks238 decks
6%synergy
Intuition
18%inclusion42 decks238 decks
16%synergy
Tainted Pact
16%inclusion37 decks238 decks
8%synergy
Borne Upon a Wind
16%inclusion37 decks238 decks
11%synergy
Teferi's Protection
15%inclusion36 decks238 decks
-2%synergy
Gifts Ungiven
15%inclusion36 decks238 decks
13%synergy
Pact of Negation
15%inclusion35 decks238 decks
7%synergy
Cabal Ritual
14%inclusion34 decks238 decks
11%synergy
Inkshield
13%inclusion32 decks238 decks
4%synergy
Brainstorm
13%inclusion31 decks238 decks
-4%synergy
Mindbreak Trap
12%inclusion29 decks238 decks
5%synergy
Frantic Search
11%inclusion27 decks238 decks
-5%synergy
Thirst for Meaning
11%inclusion27 decks238 decks
10%synergy
Void Rend
11%inclusion27 decks238 decks
-22%synergy
Mental Misstep
11%inclusion25 decks238 decks
3%synergy
Otherworldly Gaze
11%inclusion25 decks238 decks
8%synergy
Into the Flood Maw
9.2%inclusion22 decks238 decks
5%synergy
Anguished Unmaking
8.0%inclusion19 decks238 decks
-17%synergy
Fell the Profane
7.6%inclusion18 decks238 decks
-1%synergy
Deadly Rollick
7.1%inclusion17 decks238 decks
-6%synergy
Negate
7.1%inclusion17 decks238 decks
-9%synergy
Utter End
6.7%inclusion16 decks238 decks
0%synergy
Muddle the Mixture
6.3%inclusion15 decks238 decks
2%synergy
Chain of Vapor
6.3%inclusion15 decks238 decks
3%synergy
Ad Nauseam
5.9%inclusion14 decks238 decks
3%synergy
Waterlogged Teachings
5.9%inclusion14 decks238 decks
1%synergy
Retraction Helix
5.5%inclusion13 decks238 decks
5%synergy
Dispel
5.5%inclusion13 decks238 decks
2%synergy
Return to Dust
5.0%inclusion12 decks238 decks
1%synergy
Brain Freeze
5.0%inclusion12 decks238 decks
4%synergy
Delay
5.0%inclusion12 decks238 decks
3%synergy
Generous Gift
5.0%inclusion12 decks238 decks
-10%synergy
Sorceries
Windfall
29%inclusion68 decks238 decks
15%synergy
Reanimate
27%inclusion64 decks238 decks
11%synergy
Redress Fate
24%inclusion57 decks238 decks
18%synergy
Toxic Deluge
21%inclusion50 decks238 decks
2%synergy
Singularity Rupture
15%inclusion15 decks100 decks
13%synergy
Demonic Counsel
13%inclusion31 decks238 decks
12%synergy
Damn
12%inclusion28 decks238 decks
-9%synergy
Lively Dirge
11%inclusion27 decks238 decks
10%synergy
Imperial Seal
11%inclusion27 decks238 decks
4%synergy
Glimpse the Unthinkable
11%inclusion26 decks238 decks
10%synergy
Idyllic Tutor
11%inclusion26 decks238 decks
7%synergy
Extinguish All Hope
11%inclusion26 decks238 decks
9%synergy
Supreme Verdict
10%inclusion24 decks238 decks
-5%synergy
Beseech the Mirror
9.2%inclusion22 decks238 decks
5%synergy
Unmarked Grave
8.8%inclusion21 decks238 decks
7%synergy
Dance of the Manse
8.8%inclusion21 decks238 decks
5%synergy
Replenish
7.6%inclusion18 decks238 decks
6%synergy
Time Wipe
7.6%inclusion18 decks238 decks
0%synergy
Farewell
7.1%inclusion17 decks238 decks
-6%synergy
Resurgent Belief
6.3%inclusion15 decks238 decks
4%synergy
Buried Alive
6.3%inclusion15 decks238 decks
2%synergy
Ponder
5.9%inclusion14 decks238 decks
-3%synergy
Read the Bones
5.5%inclusion13 decks238 decks
1%synergy
Terminus
5.5%inclusion13 decks238 decks
1%synergy
Utility Artifacts
The One Ring
26%inclusion62 decks238 decks
12%synergy
Mesmeric Orb
21%inclusion50 decks238 decks
20%synergy
Wishclaw Talisman
19%inclusion46 decks238 decks
11%synergy
Lightning Greaves
8.0%inclusion19 decks238 decks
-14%synergy
Sensei's Divining Top
6.3%inclusion15 decks238 decks
-4%synergy
Cloud Key
5.5%inclusion13 decks238 decks
2%synergy
Enchantments
Sphere of Safety
42%inclusion99 decks238 decks
32%synergy
Secret Arcade // Dusty Parlor
38%inclusion91 decks238 decks
33%synergy
Propaganda
37%inclusion89 decks238 decks
11%synergy
Ghostly Prison
34%inclusion80 decks238 decks
12%synergy
Seal of Cleansing
32%inclusion76 decks238 decks
30%synergy
Grasp of Fate
31%inclusion73 decks238 decks
24%synergy
The Meathook Massacre
30%inclusion71 decks238 decks
26%synergy
Tinybones Joins Up
29%inclusion70 decks238 decks
28%synergy
Sigil of the Empty Throne
25%inclusion60 decks238 decks
19%synergy
Starfield of Nyx
25%inclusion60 decks238 decks
21%synergy
Estrid's Invocation
25%inclusion59 decks238 decks
20%synergy
Cemetery Tampering
24%inclusion58 decks238 decks
24%synergy
Static Prison
21%inclusion49 decks238 decks
20%synergy
Touch the Spirit Realm
21%inclusion49 decks238 decks
18%synergy
Monologue Tax
20%inclusion47 decks238 decks
14%synergy
Cacophony Unleashed
19%inclusion46 decks238 decks
18%synergy
Darksteel Mutation
19%inclusion45 decks238 decks
13%synergy
Greater Auramancy
19%inclusion45 decks238 decks
14%synergy
Seal of Removal
18%inclusion43 decks238 decks
17%synergy
Black Market Connections
17%inclusion41 decks238 decks
3%synergy
Shark Typhoon
17%inclusion41 decks238 decks
11%synergy
Out of the Tombs
16%inclusion38 decks238 decks
16%synergy
Trouble in Pairs
16%inclusion37 decks238 decks
10%synergy
Extravagant Replication
15%inclusion36 decks238 decks
10%synergy
Leyline of Anticipation
15%inclusion36 decks238 decks
11%synergy
Phyrexian Arena
15%inclusion36 decks238 decks
1%synergy
Timely Ward
14%inclusion34 decks238 decks
9%synergy
Stillness in Motion
14%inclusion25 decks179 decks
14%synergy
Defiled Crypt // Cadaver Lab
14%inclusion33 decks238 decks
13%synergy
The Tale of Tamiyo
13%inclusion32 decks238 decks
13%synergy
Authority of the Consuls
13%inclusion30 decks238 decks
2%synergy
Imprisoned in the Moon
12%inclusion29 decks238 decks
6%synergy
Polluted Cistern // Dim Oubliette
12%inclusion29 decks238 decks
12%synergy
Land Tax
12%inclusion28 decks238 decks
6%synergy
Aura of Silence
12%inclusion28 decks238 decks
8%synergy
Sheltered by Ghosts
11%inclusion27 decks238 decks
9%synergy
Copy Enchantment
11%inclusion27 decks238 decks
7%synergy
The Eldest Reborn
11%inclusion26 decks238 decks
8%synergy
Enchanted Evening
11%inclusion26 decks238 decks
9%synergy
Mirror Room // Fractured Realm
11%inclusion25 decks238 decks
8%synergy
Teval's Judgment
10%inclusion19 decks184 decks
9%synergy
Bottomless Pool // Locker Room
10%inclusion24 decks238 decks
8%synergy
One with the Multiverse
10%inclusion23 decks238 decks
5%synergy
Restricted Office // Lecture Hall
10%inclusion23 decks238 decks
7%synergy
Ethereal Armor
10%inclusion23 decks238 decks
5%synergy
Oubliette
10%inclusion23 decks238 decks
8%synergy
Hallowed Haunting
10%inclusion23 decks238 decks
7%synergy
Court of Cunning
9.2%inclusion22 decks238 decks
8%synergy
Unable to Scream
9.2%inclusion22 decks238 decks
8%synergy
All That Glitters
9.2%inclusion22 decks238 decks
0%synergy
Planeswalkers
Teferi, Time Raveler
21%inclusion51 decks238 decks
13%synergy
Utility Lands
Hall of Heliod's Generosity
57%inclusion135 decks238 decks
44%synergy
Otawara, Soaring City
37%inclusion87 decks238 decks
17%synergy
Bojuka Bog
36%inclusion86 decks238 decks
9%synergy
Takenuma, Abandoned Mire
19%inclusion46 decks238 decks
13%synergy
Urza's Saga
18%inclusion44 decks238 decks
7%synergy
Serra's Sanctum
17%inclusion41 decks238 decks
15%synergy
Urborg, Tomb of Yawgmoth
15%inclusion35 decks238 decks
1%synergy
Reliquary Tower
14%inclusion34 decks238 decks
-19%synergy
Cephalid Coliseum
13%inclusion31 decks238 decks
9%synergy
Emergence Zone
13%inclusion30 decks238 decks
10%synergy
Halimar Depths
11%inclusion26 decks238 decks
6%synergy
Minamo, School at Water's Edge
7.1%inclusion17 decks238 decks
3%synergy
Eiganjo, Seat of the Empire
5.9%inclusion14 decks238 decks
1%synergy
Cabal Coffers
5.0%inclusion12 decks238 decks
2%synergy
Rogue's Passage
5.0%inclusion12 decks238 decks
-4%synergy
Mana Artifacts
Sol Ring
93%inclusion221 decks238 decks
3%synergy
Arcane Signet
92%inclusion219 decks238 decks
4%synergy
Talisman of Dominance
58%inclusion138 decks238 decks
9%synergy
Talisman of Progress
52%inclusion124 decks238 decks
10%synergy
Talisman of Hierarchy
51%inclusion121 decks238 decks
8%synergy
Fellwar Stone
42%inclusion100 decks238 decks
8%synergy
Azorius Signet
37%inclusion88 decks238 decks
4%synergy
Orzhov Signet
33%inclusion78 decks238 decks
-2%synergy
Lotus Petal
24%inclusion57 decks238 decks
13%synergy
Mana Vault
24%inclusion57 decks238 decks
14%synergy
Dimir Signet
24%inclusion56 decks238 decks
-9%synergy
Chrome Mox
19%inclusion46 decks238 decks
10%synergy
Mind Stone
14%inclusion33 decks238 decks
1%synergy
Mox Opal
12%inclusion28 decks238 decks
3%synergy
Mox Diamond
12%inclusion28 decks238 decks
4%synergy
Lion's Eye Diamond
10%inclusion24 decks238 decks
8%synergy
Mox Amber
10%inclusion23 decks238 decks
4%synergy
Commander's Sphere
7.6%inclusion18 decks238 decks
-12%synergy
Thought Vessel
7.6%inclusion18 decks238 decks
-17%synergy
Basalt Monolith
5.5%inclusion13 decks238 decks
3%synergy
Lands
Command Tower
95%inclusion227 decks238 decks
3%synergy
Island
90%inclusion215 decks238 decks
-2%synergy
Swamp
90%inclusion214 decks238 decks
-1%synergy
Plains
89%inclusion212 decks238 decks
-2%synergy
Watery Grave
65%inclusion155 decks238 decks
16%synergy
Hallowed Fountain
64%inclusion153 decks238 decks
15%synergy
Godless Shrine
62%inclusion148 decks238 decks
12%synergy
Polluted Delta
60%inclusion143 decks238 decks
23%synergy
Flooded Strand
60%inclusion143 decks238 decks
22%synergy
Marsh Flats
55%inclusion132 decks238 decks
19%synergy
Exotic Orchard
51%inclusion122 decks238 decks
-7%synergy
Raffine's Tower
48%inclusion115 decks238 decks
7%synergy
Caves of Koilos
47%inclusion113 decks238 decks
12%synergy
Adarkar Wastes
46%inclusion109 decks238 decks
15%synergy
Underground River
45%inclusion108 decks238 decks
13%synergy
Sea of Clouds
44%inclusion105 decks238 decks
8%synergy
Arcane Sanctum
44%inclusion105 decks238 decks
-10%synergy
Morphic Pool
42%inclusion100 decks238 decks
8%synergy
Vault of Champions
41%inclusion98 decks238 decks
8%synergy
Undercity Sewers
40%inclusion96 decks238 decks
26%synergy
Shadowy Backstreet
35%inclusion84 decks238 decks
23%synergy
Meticulous Archive
35%inclusion84 decks238 decks
22%synergy
Glacial Fortress
33%inclusion79 decks238 decks
-6%synergy
Isolated Chapel
29%inclusion69 decks238 decks
-9%synergy
Tundra
26%inclusion61 decks238 decks
10%synergy
City of Brass
25%inclusion59 decks238 decks
10%synergy
Azorius Chancery
24%inclusion58 decks238 decks
10%synergy
Underground Sea
24%inclusion58 decks238 decks
9%synergy
Scrubland
24%inclusion58 decks238 decks
8%synergy
Drowned Catacomb
23%inclusion55 decks238 decks
-12%synergy
Bloodstained Mire
23%inclusion54 decks238 decks
12%synergy
Orzhov Basilica
22%inclusion53 decks238 decks
6%synergy
Dimir Aqueduct
22%inclusion52 decks238 decks
8%synergy
Prairie Stream
22%inclusion52 decks238 decks
-19%synergy
Tainted Isle
21%inclusion50 decks238 decks
15%synergy
Misty Rainforest
21%inclusion49 decks238 decks
9%synergy
Temple of Deceit
21%inclusion49 decks238 decks
2%synergy
Valgavoth's Lair
21%inclusion49 decks238 decks
18%synergy
Floodfarm Verge
21%inclusion49 decks238 decks
9%synergy
Gloomlake Verge
21%inclusion49 decks238 decks
10%synergy
Windswept Heath
20%inclusion48 decks238 decks
10%synergy
Temple of Silence
20%inclusion48 decks238 decks
0%synergy
Temple of Enlightenment
20%inclusion48 decks238 decks
3%synergy
Tainted Field
20%inclusion47 decks238 decks
13%synergy
Mana Confluence
20%inclusion47 decks238 decks
6%synergy
Sunken Hollow
19%inclusion46 decks238 decks
-20%synergy
Terramorphic Expanse
19%inclusion45 decks238 decks
2%synergy
Verdant Catacombs
19%inclusion45 decks238 decks
8%synergy
Scalding Tarn
18%inclusion44 decks238 decks
7%synergy
Sink into Stupor
18%inclusion44 decks238 decks
6%synergy
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