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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Eiganjo Dynastorian
8.3%inclusion1 decks12 decks
8%synergy
Shredder's Technique
1.8%inclusion1 decks57 decks
-1%synergy
High Synergy Cards
Animate Dead
76%inclusion226 decks296 decks
67%synergy
Ripples of Undeath
67%inclusion198 decks296 decks
64%synergy
Necromancy
68%inclusion200 decks296 decks
63%synergy
Dress Down
63%inclusion187 decks296 decks
61%synergy
Abdel Adrian, Gorion's Ward
52%inclusion155 decks296 decks
51%synergy
Entomb
57%inclusion170 decks296 decks
51%synergy
Inquisitive Glimmer
58%inclusion171 decks296 decks
50%synergy
Mystic Remora
70%inclusion208 decks296 decks
50%synergy
Sevinne's Reclamation
56%inclusion167 decks296 decks
48%synergy
Entity Tracker
52%inclusion155 decks296 decks
46%synergy
Top Cards
Swords to Plowshares
64%inclusion189 decks296 decks
-4%synergy
Mesa Enchantress
53%inclusion157 decks296 decks
44%synergy
Mirrormade
49%inclusion146 decks296 decks
40%synergy
Starfield Mystic
46%inclusion137 decks296 decks
40%synergy
Gravebreaker Lamia
45%inclusion133 decks296 decks
44%synergy
Dance of the Dead
44%inclusion131 decks296 decks
42%synergy
Blind Obedience
44%inclusion131 decks296 decks
32%synergy
Demon of Fate's Design
43%inclusion128 decks296 decks
38%synergy
Amphibian Downpour
43%inclusion127 decks296 decks
38%synergy
Scrabbling Skullcrab
43%inclusion126 decks296 decks
42%synergy
Game Changers
Smothering Tithe
64%inclusion189 decks296 decks
33%synergy
Rhystic Study
64%inclusion188 decks296 decks
32%synergy
Enlightened Tutor
51%inclusion150 decks296 decks
31%synergy
Demonic Tutor
45%inclusion132 decks296 decks
24%synergy
Vampiric Tutor
39%inclusion114 decks296 decks
22%synergy
Thassa's Oracle
33%inclusion97 decks296 decks
24%synergy
Fierce Guardianship
31%inclusion92 decks296 decks
11%synergy
Cyclonic Rift
31%inclusion92 decks296 decks
8%synergy
Necropotence
30%inclusion89 decks296 decks
24%synergy
Ancient Tomb
28%inclusion84 decks296 decks
16%synergy
Creatures
Overlord of the Balemurk
40%inclusion119 decks296 decks
38%synergy
Esper Sentinel
38%inclusion111 decks296 decks
10%synergy
Ondu Spiritdancer
38%inclusion111 decks296 decks
31%synergy
Overlord of the Floodpits
36%inclusion108 decks296 decks
33%synergy
Fear of Sleep Paralysis
35%inclusion103 decks296 decks
30%synergy
Doomwake Giant
35%inclusion103 decks296 decks
29%synergy
Fear of Impostors
32%inclusion96 decks296 decks
31%synergy
Lotho, Corrupt Shirriff
31%inclusion93 decks296 decks
15%synergy
Zur, Eternal Schemer
31%inclusion93 decks296 decks
28%synergy
Grand Abolisher
28%inclusion84 decks296 decks
14%synergy
Victor, Valgavoth's Seneschal
28%inclusion83 decks296 decks
26%synergy
Zur the Enchanter
23%inclusion69 decks296 decks
18%synergy
Heliod, the Radiant Dawn
22%inclusion66 decks296 decks
19%synergy
Valley Floodcaller
22%inclusion65 decks296 decks
18%synergy
Orcish Bowmasters
22%inclusion65 decks296 decks
12%synergy
Grim Guardian
21%inclusion63 decks296 decks
19%synergy
Hullbreaker Horror
21%inclusion63 decks296 decks
15%synergy
Moon-Blessed Cleric
20%inclusion58 decks296 decks
15%synergy
Ledger Shredder
19%inclusion57 decks296 decks
11%synergy
Displacer Kitten
19%inclusion56 decks296 decks
12%synergy
Ghostly Dancers
19%inclusion56 decks296 decks
16%synergy
Silent Hallcreeper
18%inclusion54 decks296 decks
14%synergy
Soaring Lightbringer
18%inclusion53 decks296 decks
13%synergy
Enduring Curiosity
18%inclusion52 decks296 decks
10%synergy
Lurrus of the Dream-Den
17%inclusion51 decks296 decks
16%synergy
Hedron Crab
15%inclusion44 decks296 decks
14%synergy
Aminatou, Veil Piercer
15%inclusion43 decks296 decks
13%synergy
Wan Shi Tong, Librarian
14%inclusion16 decks118 decks
8%synergy
Opposition Agent
14%inclusion40 decks296 decks
5%synergy
Ranger-Captain of Eos
13%inclusion38 decks296 decks
7%synergy
Balemurk Leech
13%inclusion38 decks296 decks
12%synergy
Archon of Sun's Grace
13%inclusion37 decks296 decks
8%synergy
Gremlin Tamer
13%inclusion37 decks296 decks
11%synergy
Talion, the Kindly Lord
12%inclusion35 decks296 decks
4%synergy
Psychic Frog
11%inclusion34 decks296 decks
4%synergy
Voice of Victory
11%inclusion28 decks249 decks
3%synergy
Archetype of Imagination
11%inclusion32 decks296 decks
6%synergy
Drannith Magistrate
10%inclusion31 decks296 decks
3%synergy
Mindwrack Harpy
10%inclusion30 decks296 decks
10%synergy
Overlord of the Mistmoors
10%inclusion29 decks296 decks
8%synergy
Mockingbird
10%inclusion29 decks296 decks
5%synergy
Archivist of Oghma
9.1%inclusion27 decks296 decks
3%synergy
Faerie Mastermind
9.1%inclusion27 decks296 decks
0%synergy
Skullsnap Nuisance
8.8%inclusion26 decks296 decks
8%synergy
Ancient Cellarspawn
8.8%inclusion26 decks296 decks
6%synergy
Sage of Mysteries
7.8%inclusion23 decks296 decks
7%synergy
Leonin Relic-Warder
7.8%inclusion23 decks296 decks
8%synergy
Athreos, Shroud-Veiled
7.8%inclusion23 decks296 decks
3%synergy
Spirited Companion
7.8%inclusion23 decks296 decks
6%synergy
Laboratory Maniac
7.4%inclusion22 decks296 decks
4%synergy
Instants
Dark Ritual
43%inclusion126 decks296 decks
23%synergy
An Offer You Can't Refuse
42%inclusion124 decks296 decks
15%synergy
Path to Exile
34%inclusion101 decks296 decks
-8%synergy
Swan Song
31%inclusion93 decks296 decks
12%synergy
Counterspell
31%inclusion91 decks296 decks
-11%synergy
Arcane Denial
29%inclusion85 decks296 decks
8%synergy
Mana Drain
26%inclusion78 decks296 decks
9%synergy
Silence
25%inclusion74 decks296 decks
15%synergy
Force of Will
25%inclusion73 decks296 decks
12%synergy
Mystical Tutor
24%inclusion71 decks296 decks
13%synergy
Force of Negation
21%inclusion62 decks296 decks
9%synergy
Flusterstorm
21%inclusion61 decks296 decks
13%synergy
Dovin's Veto
20%inclusion58 decks296 decks
-6%synergy
Demonic Consultation
19%inclusion57 decks296 decks
11%synergy
Sink into Stupor
19%inclusion55 decks296 decks
6%synergy
Gifts Ungiven
18%inclusion54 decks296 decks
16%synergy
Intuition
17%inclusion49 decks296 decks
15%synergy
Tainted Pact
16%inclusion46 decks296 decks
9%synergy
Cabal Ritual
16%inclusion46 decks296 decks
12%synergy
Borne Upon a Wind
15%inclusion44 decks296 decks
10%synergy
Frantic Search
13%inclusion39 decks296 decks
-5%synergy
Brainstorm
13%inclusion38 decks296 decks
-4%synergy
Teferi's Protection
13%inclusion37 decks296 decks
-4%synergy
Pact of Negation
13%inclusion37 decks296 decks
5%synergy
Mindbreak Trap
12%inclusion36 decks296 decks
5%synergy
Inkshield
12%inclusion36 decks296 decks
3%synergy
Void Rend
12%inclusion35 decks296 decks
-23%synergy
Mental Misstep
11%inclusion33 decks296 decks
5%synergy
Thirst for Meaning
11%inclusion33 decks296 decks
10%synergy
Otherworldly Gaze
10%inclusion30 decks296 decks
8%synergy
Into the Flood Maw
10%inclusion29 decks296 decks
6%synergy
Anguished Unmaking
8.1%inclusion24 decks296 decks
-17%synergy
Fell the Profane
7.8%inclusion23 decks296 decks
-1%synergy
Negate
7.8%inclusion23 decks296 decks
-9%synergy
Muddle the Mixture
7.4%inclusion22 decks296 decks
4%synergy
Deadly Rollick
6.8%inclusion20 decks296 decks
-8%synergy
Chain of Vapor
6.8%inclusion20 decks296 decks
4%synergy
Utter End
6.8%inclusion20 decks296 decks
0%synergy
Ad Nauseam
6.1%inclusion18 decks296 decks
4%synergy
Waterlogged Teachings
5.7%inclusion17 decks296 decks
1%synergy
Brain Freeze
5.1%inclusion15 decks296 decks
5%synergy
Delay
5.1%inclusion15 decks296 decks
3%synergy
Sorceries
Reanimate
30%inclusion89 decks296 decks
14%synergy
Windfall
29%inclusion87 decks296 decks
16%synergy
Redress Fate
24%inclusion71 decks296 decks
18%synergy
Toxic Deluge
22%inclusion65 decks296 decks
2%synergy
Demonic Counsel
13%inclusion39 decks296 decks
12%synergy
Damn
13%inclusion38 decks296 decks
-8%synergy
Glimpse the Unthinkable
13%inclusion37 decks296 decks
12%synergy
Singularity Rupture
12%inclusion20 decks169 decks
10%synergy
Lively Dirge
12%inclusion35 decks296 decks
11%synergy
Idyllic Tutor
11%inclusion32 decks296 decks
7%synergy
Extinguish All Hope
11%inclusion32 decks296 decks
9%synergy
Unmarked Grave
10%inclusion31 decks296 decks
9%synergy
Supreme Verdict
10%inclusion29 decks296 decks
-5%synergy
Imperial Seal
10%inclusion29 decks296 decks
3%synergy
Replenish
9.5%inclusion28 decks296 decks
8%synergy
Beseech the Mirror
9.1%inclusion27 decks296 decks
5%synergy
Dance of the Manse
8.8%inclusion26 decks296 decks
5%synergy
Resurgent Belief
8.1%inclusion24 decks296 decks
6%synergy
Farewell
8.1%inclusion24 decks296 decks
-4%synergy
Buried Alive
7.8%inclusion23 decks296 decks
4%synergy
Time Wipe
7.1%inclusion21 decks296 decks
1%synergy
Ponder
5.7%inclusion17 decks296 decks
-3%synergy
Utility Artifacts
The One Ring
25%inclusion73 decks296 decks
12%synergy
Mesmeric Orb
21%inclusion61 decks296 decks
19%synergy
Wishclaw Talisman
20%inclusion60 decks296 decks
12%synergy
Lightning Greaves
9.1%inclusion27 decks296 decks
-14%synergy
Cloud Key
6.1%inclusion18 decks296 decks
3%synergy
Sensei's Divining Top
5.7%inclusion17 decks296 decks
-4%synergy
Enchantments
Sphere of Safety
41%inclusion121 decks296 decks
31%synergy
Secret Arcade // Dusty Parlor
40%inclusion118 decks296 decks
35%synergy
Propaganda
35%inclusion105 decks296 decks
7%synergy
Ghostly Prison
32%inclusion96 decks296 decks
10%synergy
The Meathook Massacre
31%inclusion92 decks296 decks
28%synergy
Grasp of Fate
30%inclusion90 decks296 decks
24%synergy
Seal of Cleansing
30%inclusion90 decks296 decks
29%synergy
Tinybones Joins Up
28%inclusion84 decks296 decks
27%synergy
Starfield of Nyx
26%inclusion78 decks296 decks
22%synergy
Cemetery Tampering
25%inclusion73 decks296 decks
24%synergy
Sigil of the Empty Throne
24%inclusion71 decks296 decks
18%synergy
Estrid's Invocation
24%inclusion70 decks296 decks
19%synergy
Touch the Spirit Realm
22%inclusion65 decks296 decks
20%synergy
Monologue Tax
22%inclusion64 decks296 decks
15%synergy
Greater Auramancy
20%inclusion59 decks296 decks
16%synergy
Static Prison
19%inclusion56 decks296 decks
18%synergy
Darksteel Mutation
19%inclusion55 decks296 decks
13%synergy
Cacophony Unleashed
19%inclusion55 decks296 decks
17%synergy
Black Market Connections
18%inclusion53 decks296 decks
3%synergy
Seal of Removal
17%inclusion50 decks296 decks
16%synergy
Out of the Tombs
16%inclusion46 decks296 decks
15%synergy
Leyline of Anticipation
15%inclusion45 decks296 decks
11%synergy
Shark Typhoon
15%inclusion44 decks296 decks
9%synergy
Extravagant Replication
15%inclusion43 decks296 decks
10%synergy
Defiled Crypt // Cadaver Lab
14%inclusion42 decks296 decks
13%synergy
Phyrexian Arena
14%inclusion41 decks296 decks
0%synergy
Timely Ward
14%inclusion40 decks296 decks
9%synergy
Stillness in Motion
13%inclusion32 decks242 decks
13%synergy
Trouble in Pairs
13%inclusion39 decks296 decks
8%synergy
The Tale of Tamiyo
13%inclusion37 decks296 decks
12%synergy
Copy Enchantment
13%inclusion37 decks296 decks
8%synergy
Polluted Cistern // Dim Oubliette
13%inclusion37 decks296 decks
12%synergy
Sheltered by Ghosts
12%inclusion36 decks296 decks
10%synergy
Authority of the Consuls
12%inclusion35 decks296 decks
-1%synergy
Mirror Room // Fractured Realm
12%inclusion35 decks296 decks
10%synergy
Enchanted Evening
11%inclusion33 decks296 decks
10%synergy
Restricted Office // Lecture Hall
11%inclusion32 decks296 decks
9%synergy
Land Tax
11%inclusion32 decks296 decks
5%synergy
Hallowed Haunting
11%inclusion32 decks296 decks
8%synergy
Bottomless Pool // Locker Room
10%inclusion31 decks296 decks
9%synergy
Aura of Silence
10%inclusion31 decks296 decks
7%synergy
Central Elevator // Promising Stairs
10%inclusion30 decks296 decks
10%synergy
Ethereal Armor
10%inclusion30 decks296 decks
5%synergy
One with the Multiverse
10%inclusion29 decks296 decks
5%synergy
Court of Cunning
10%inclusion29 decks296 decks
9%synergy
The Eldest Reborn
10%inclusion29 decks296 decks
7%synergy
Imprisoned in the Moon
9.5%inclusion28 decks296 decks
3%synergy
Oubliette
9.5%inclusion28 decks296 decks
8%synergy
Nowhere to Run
9.1%inclusion27 decks296 decks
8%synergy
Teval's Judgment
8.5%inclusion21 decks246 decks
8%synergy
Planeswalkers
Teferi, Time Raveler
20%inclusion60 decks296 decks
12%synergy
Utility Lands
Hall of Heliod's Generosity
55%inclusion163 decks296 decks
42%synergy
Otawara, Soaring City
38%inclusion111 decks296 decks
18%synergy
Bojuka Bog
34%inclusion100 decks296 decks
7%synergy
Takenuma, Abandoned Mire
21%inclusion62 decks296 decks
15%synergy
Urza's Saga
18%inclusion53 decks296 decks
6%synergy
Serra's Sanctum
18%inclusion52 decks296 decks
16%synergy
Urborg, Tomb of Yawgmoth
14%inclusion42 decks296 decks
1%synergy
Reliquary Tower
14%inclusion40 decks296 decks
-20%synergy
Cephalid Coliseum
13%inclusion39 decks296 decks
10%synergy
Emergence Zone
13%inclusion37 decks296 decks
10%synergy
Halimar Depths
10%inclusion29 decks296 decks
5%synergy
Minamo, School at Water's Edge
6.8%inclusion20 decks296 decks
3%synergy
Eiganjo, Seat of the Empire
5.7%inclusion17 decks296 decks
1%synergy
Mana Artifacts
Sol Ring
94%inclusion278 decks296 decks
4%synergy
Arcane Signet
92%inclusion273 decks296 decks
4%synergy
Talisman of Dominance
55%inclusion163 decks296 decks
5%synergy
Talisman of Hierarchy
51%inclusion151 decks296 decks
7%synergy
Talisman of Progress
50%inclusion148 decks296 decks
6%synergy
Fellwar Stone
42%inclusion123 decks296 decks
8%synergy
Azorius Signet
36%inclusion106 decks296 decks
5%synergy
Orzhov Signet
32%inclusion94 decks296 decks
-1%synergy
Lotus Petal
26%inclusion76 decks296 decks
15%synergy
Mana Vault
24%inclusion72 decks296 decks
15%synergy
Dimir Signet
23%inclusion67 decks296 decks
-8%synergy
Chrome Mox
20%inclusion60 decks296 decks
11%synergy
Mind Stone
12%inclusion35 decks296 decks
0%synergy
Mox Opal
12%inclusion35 decks296 decks
3%synergy
Mox Diamond
11%inclusion33 decks296 decks
4%synergy
Mox Amber
11%inclusion32 decks296 decks
5%synergy
Lion's Eye Diamond
8.8%inclusion26 decks296 decks
7%synergy
Commander's Sphere
7.8%inclusion23 decks296 decks
-10%synergy
Thought Vessel
6.8%inclusion20 decks296 decks
-18%synergy
Lands
Command Tower
95%inclusion280 decks296 decks
2%synergy
Island
91%inclusion268 decks296 decks
-2%synergy
Swamp
90%inclusion265 decks296 decks
-2%synergy
Plains
89%inclusion263 decks296 decks
-3%synergy
Hallowed Fountain
68%inclusion200 decks296 decks
17%synergy
Watery Grave
67%inclusion198 decks296 decks
16%synergy
Godless Shrine
65%inclusion193 decks296 decks
14%synergy
Flooded Strand
61%inclusion181 decks296 decks
23%synergy
Polluted Delta
60%inclusion178 decks296 decks
22%synergy
Marsh Flats
57%inclusion169 decks296 decks
21%synergy
Exotic Orchard
53%inclusion158 decks296 decks
-5%synergy
Raffine's Tower
50%inclusion147 decks296 decks
9%synergy
Caves of Koilos
47%inclusion140 decks296 decks
12%synergy
Adarkar Wastes
47%inclusion139 decks296 decks
15%synergy
Underground River
47%inclusion138 decks296 decks
13%synergy
Sea of Clouds
44%inclusion130 decks296 decks
9%synergy
Arcane Sanctum
43%inclusion126 decks296 decks
-12%synergy
Morphic Pool
42%inclusion124 decks296 decks
8%synergy
Undercity Sewers
42%inclusion123 decks296 decks
27%synergy
Vault of Champions
41%inclusion120 decks296 decks
8%synergy
Glacial Fortress
36%inclusion107 decks296 decks
-6%synergy
Shadowy Backstreet
36%inclusion106 decks296 decks
23%synergy
Meticulous Archive
35%inclusion105 decks296 decks
22%synergy
Isolated Chapel
31%inclusion92 decks296 decks
-10%synergy
City of Brass
27%inclusion81 decks296 decks
12%synergy
Tundra
26%inclusion77 decks296 decks
10%synergy
Underground Sea
25%inclusion75 decks296 decks
10%synergy
Scrubland
25%inclusion74 decks296 decks
9%synergy
Drowned Catacomb
24%inclusion72 decks296 decks
-13%synergy
Floodfarm Verge
23%inclusion68 decks296 decks
12%synergy
Prairie Stream
22%inclusion66 decks296 decks
-18%synergy
Azorius Chancery
22%inclusion64 decks296 decks
8%synergy
Valgavoth's Lair
22%inclusion64 decks296 decks
19%synergy
Bloodstained Mire
21%inclusion63 decks296 decks
11%synergy
Gloomlake Verge
21%inclusion63 decks296 decks
10%synergy
Tainted Isle
21%inclusion62 decks296 decks
15%synergy
Mana Confluence
21%inclusion62 decks296 decks
7%synergy
Sunken Hollow
21%inclusion61 decks296 decks
-19%synergy
Dimir Aqueduct
20%inclusion59 decks296 decks
7%synergy
Windswept Heath
19%inclusion57 decks296 decks
10%synergy
Tainted Field
19%inclusion57 decks296 decks
12%synergy
Misty Rainforest
19%inclusion56 decks296 decks
8%synergy
Orzhov Basilica
19%inclusion56 decks296 decks
4%synergy
Verdant Catacombs
19%inclusion55 decks296 decks
9%synergy
Sink into Stupor
19%inclusion55 decks296 decks
6%synergy
Temple of Enlightenment
18%inclusion54 decks296 decks
2%synergy
Temple of Silence
18%inclusion54 decks296 decks
-1%synergy
Temple of Deceit
18%inclusion53 decks296 decks
1%synergy
Scalding Tarn
18%inclusion52 decks296 decks
7%synergy
Arid Mesa
17%inclusion50 decks296 decks
7%synergy
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