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
6.1%inclusion4 decks66 decks
5%synergy
Shredder's Technique
3.0%inclusion1 decks33 decks
1%synergy
Moonshadow
1.6%inclusion1 decks61 decks
1%synergy
Thirst for Identity
1.6%inclusion1 decks61 decks
0%synergy
Noggle the Mind
1.6%inclusion1 decks61 decks
1%synergy
High Synergy Cards
Animate Dead
77%inclusion213 decks277 decks
67%synergy
Ripples of Undeath
67%inclusion186 decks277 decks
64%synergy
Necromancy
67%inclusion185 decks277 decks
62%synergy
Dress Down
63%inclusion174 decks277 decks
60%synergy
Inquisitive Glimmer
58%inclusion162 decks277 decks
51%synergy
Entomb
57%inclusion159 decks277 decks
51%synergy
Abdel Adrian, Gorion's Ward
52%inclusion144 decks277 decks
50%synergy
Mystic Remora
71%inclusion196 decks277 decks
50%synergy
Sevinne's Reclamation
56%inclusion156 decks277 decks
47%synergy
Entity Tracker
53%inclusion146 decks277 decks
46%synergy
Top Cards
Swords to Plowshares
63%inclusion175 decks277 decks
-5%synergy
Mesa Enchantress
53%inclusion147 decks277 decks
44%synergy
Mirrormade
50%inclusion138 decks277 decks
40%synergy
Starfield Mystic
46%inclusion128 decks277 decks
40%synergy
Gravebreaker Lamia
46%inclusion127 decks277 decks
45%synergy
Dance of the Dead
44%inclusion123 decks277 decks
42%synergy
Blind Obedience
44%inclusion123 decks277 decks
32%synergy
Demon of Fate's Design
43%inclusion120 decks277 decks
38%synergy
Dark Ritual
43%inclusion119 decks277 decks
23%synergy
Amphibian Downpour
43%inclusion118 decks277 decks
38%synergy
Game Changers
Rhystic Study
64%inclusion177 decks277 decks
33%synergy
Smothering Tithe
62%inclusion173 decks277 decks
31%synergy
Enlightened Tutor
49%inclusion137 decks277 decks
30%synergy
Demonic Tutor
43%inclusion120 decks277 decks
23%synergy
Vampiric Tutor
38%inclusion105 decks277 decks
21%synergy
Thassa's Oracle
32%inclusion89 decks277 decks
23%synergy
Necropotence
30%inclusion83 decks277 decks
23%synergy
Fierce Guardianship
30%inclusion83 decks277 decks
9%synergy
Cyclonic Rift
30%inclusion83 decks277 decks
6%synergy
Ancient Tomb
27%inclusion76 decks277 decks
15%synergy
Creatures
Scrabbling Skullcrab
42%inclusion117 decks277 decks
41%synergy
Overlord of the Balemurk
39%inclusion108 decks277 decks
37%synergy
Ondu Spiritdancer
38%inclusion104 decks277 decks
31%synergy
Esper Sentinel
36%inclusion101 decks277 decks
9%synergy
Overlord of the Floodpits
36%inclusion99 decks277 decks
32%synergy
Fear of Sleep Paralysis
35%inclusion97 decks277 decks
30%synergy
Doomwake Giant
35%inclusion96 decks277 decks
29%synergy
Fear of Impostors
34%inclusion95 decks277 decks
33%synergy
Zur, Eternal Schemer
31%inclusion86 decks277 decks
28%synergy
Lotho, Corrupt Shirriff
30%inclusion82 decks277 decks
13%synergy
Grand Abolisher
29%inclusion80 decks277 decks
14%synergy
Victor, Valgavoth's Seneschal
29%inclusion79 decks277 decks
27%synergy
Zur the Enchanter
24%inclusion66 decks277 decks
19%synergy
Hullbreaker Horror
23%inclusion64 decks277 decks
17%synergy
Valley Floodcaller
22%inclusion61 decks277 decks
18%synergy
Heliod, the Radiant Dawn
22%inclusion61 decks277 decks
18%synergy
Grim Guardian
22%inclusion60 decks277 decks
19%synergy
Orcish Bowmasters
22%inclusion60 decks277 decks
11%synergy
Moon-Blessed Cleric
21%inclusion58 decks277 decks
16%synergy
Ghostly Dancers
20%inclusion56 decks277 decks
18%synergy
Displacer Kitten
19%inclusion53 decks277 decks
12%synergy
Ledger Shredder
19%inclusion53 decks277 decks
10%synergy
Silent Hallcreeper
18%inclusion51 decks277 decks
14%synergy
Soaring Lightbringer
18%inclusion50 decks277 decks
13%synergy
Enduring Curiosity
17%inclusion48 decks277 decks
9%synergy
Lurrus of the Dream-Den
16%inclusion43 decks277 decks
14%synergy
Aminatou, Veil Piercer
16%inclusion43 decks277 decks
14%synergy
Hedron Crab
14%inclusion40 decks277 decks
14%synergy
Opposition Agent
13%inclusion37 decks277 decks
5%synergy
Balemurk Leech
13%inclusion37 decks277 decks
13%synergy
Ranger-Captain of Eos
12%inclusion34 decks277 decks
6%synergy
Wan Shi Tong, Librarian
12%inclusion12 decks99 decks
7%synergy
Archon of Sun's Grace
12%inclusion33 decks277 decks
7%synergy
Gremlin Tamer
12%inclusion32 decks277 decks
11%synergy
Talion, the Kindly Lord
12%inclusion32 decks277 decks
4%synergy
Archetype of Imagination
12%inclusion32 decks277 decks
7%synergy
Psychic Frog
11%inclusion31 decks277 decks
4%synergy
Drannith Magistrate
11%inclusion30 decks277 decks
3%synergy
Mindwrack Harpy
11%inclusion30 decks277 decks
11%synergy
Voice of Victory
10%inclusion24 decks230 decks
2%synergy
Archivist of Oghma
10%inclusion27 decks277 decks
3%synergy
Skullsnap Nuisance
10%inclusion27 decks277 decks
9%synergy
Mockingbird
10%inclusion27 decks277 decks
5%synergy
Overlord of the Mistmoors
9.4%inclusion26 decks277 decks
7%synergy
Faerie Mastermind
8.7%inclusion24 decks277 decks
-1%synergy
Ancient Cellarspawn
8.7%inclusion24 decks277 decks
6%synergy
Spirited Companion
8.3%inclusion23 decks277 decks
6%synergy
Athreos, Shroud-Veiled
8.3%inclusion23 decks277 decks
4%synergy
Laboratory Maniac
7.9%inclusion22 decks277 decks
5%synergy
Leonin Relic-Warder
7.9%inclusion22 decks277 decks
8%synergy
Instants
An Offer You Can't Refuse
42%inclusion117 decks277 decks
15%synergy
Path to Exile
34%inclusion93 decks277 decks
-9%synergy
Swan Song
31%inclusion87 decks277 decks
12%synergy
Counterspell
31%inclusion87 decks277 decks
-10%synergy
Arcane Denial
30%inclusion82 decks277 decks
9%synergy
Mana Drain
26%inclusion73 decks277 decks
9%synergy
Silence
25%inclusion69 decks277 decks
15%synergy
Mystical Tutor
24%inclusion67 decks277 decks
13%synergy
Force of Will
23%inclusion63 decks277 decks
10%synergy
Flusterstorm
21%inclusion59 decks277 decks
13%synergy
Force of Negation
20%inclusion55 decks277 decks
8%synergy
Dovin's Veto
19%inclusion53 decks277 decks
-6%synergy
Demonic Consultation
19%inclusion53 decks277 decks
11%synergy
Sink into Stupor
18%inclusion51 decks277 decks
6%synergy
Gifts Ungiven
18%inclusion50 decks277 decks
16%synergy
Intuition
16%inclusion45 decks277 decks
15%synergy
Borne Upon a Wind
16%inclusion43 decks277 decks
11%synergy
Tainted Pact
15%inclusion41 decks277 decks
8%synergy
Cabal Ritual
15%inclusion41 decks277 decks
11%synergy
Frantic Search
14%inclusion39 decks277 decks
-4%synergy
Brainstorm
13%inclusion37 decks277 decks
-4%synergy
Inkshield
13%inclusion36 decks277 decks
4%synergy
Teferi's Protection
12%inclusion34 decks277 decks
-4%synergy
Mindbreak Trap
12%inclusion34 decks277 decks
6%synergy
Thirst for Meaning
12%inclusion34 decks277 decks
11%synergy
Pact of Negation
12%inclusion34 decks277 decks
5%synergy
Void Rend
11%inclusion31 decks277 decks
-23%synergy
Otherworldly Gaze
11%inclusion31 decks277 decks
9%synergy
Mental Misstep
11%inclusion30 decks277 decks
4%synergy
Into the Flood Maw
10%inclusion27 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
7.2%inclusion20 decks277 decks
1%synergy
Chain of Vapor
6.5%inclusion18 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
5.4%inclusion15 decks277 decks
5%synergy
Return to Dust
5.1%inclusion14 decks277 decks
2%synergy
Delay
5.1%inclusion14 decks277 decks
3%synergy
Sorceries
Reanimate
29%inclusion81 decks277 decks
13%synergy
Windfall
29%inclusion80 decks277 decks
15%synergy
Redress Fate
26%inclusion71 decks277 decks
20%synergy
Toxic Deluge
22%inclusion61 decks277 decks
2%synergy
Demonic Counsel
14%inclusion38 decks277 decks
13%synergy
Glimpse the Unthinkable
13%inclusion37 decks277 decks
13%synergy
Singularity Rupture
13%inclusion19 decks150 decks
10%synergy
Damn
13%inclusion35 decks277 decks
-8%synergy
Lively Dirge
12%inclusion33 decks277 decks
11%synergy
Idyllic Tutor
11%inclusion31 decks277 decks
7%synergy
Unmarked Grave
10%inclusion28 decks277 decks
9%synergy
Extinguish All Hope
10%inclusion28 decks277 decks
8%synergy
Supreme Verdict
10%inclusion27 decks277 decks
-5%synergy
Imperial Seal
9.0%inclusion25 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
8.7%inclusion24 decks277 decks
5%synergy
Farewell
7.9%inclusion22 decks277 decks
-5%synergy
Time Wipe
7.6%inclusion21 decks277 decks
1%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%inclusion68 decks277 decks
11%synergy
Mesmeric Orb
21%inclusion57 decks277 decks
19%synergy
Wishclaw Talisman
20%inclusion56 decks277 decks
12%synergy
Lightning Greaves
9.0%inclusion25 decks277 decks
-14%synergy
Sensei's Divining Top
5.8%inclusion16 decks277 decks
-4%synergy
Cloud Key
5.4%inclusion15 decks277 decks
2%synergy
Enchantments
Sphere of Safety
42%inclusion115 decks277 decks
32%synergy
Secret Arcade // Dusty Parlor
40%inclusion111 decks277 decks
35%synergy
Propaganda
35%inclusion98 decks277 decks
8%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
30%inclusion83 decks277 decks
27%synergy
Tinybones Joins Up
29%inclusion80 decks277 decks
28%synergy
Cemetery Tampering
26%inclusion72 decks277 decks
25%synergy
Starfield of Nyx
25%inclusion69 decks277 decks
21%synergy
Sigil of the Empty Throne
24%inclusion67 decks277 decks
18%synergy
Estrid's Invocation
23%inclusion63 decks277 decks
18%synergy
Touch the Spirit Realm
22%inclusion60 decks277 decks
19%synergy
Monologue Tax
22%inclusion60 decks277 decks
15%synergy
Greater Auramancy
19%inclusion54 decks277 decks
15%synergy
Static Prison
19%inclusion53 decks277 decks
19%synergy
Cacophony Unleashed
18%inclusion51 decks277 decks
17%synergy
Darksteel Mutation
18%inclusion50 decks277 decks
12%synergy
Black Market Connections
18%inclusion49 decks277 decks
3%synergy
Seal of Removal
17%inclusion47 decks277 decks
16%synergy
Shark Typhoon
16%inclusion45 decks277 decks
10%synergy
Leyline of Anticipation
16%inclusion44 decks277 decks
11%synergy
Out of the Tombs
16%inclusion43 decks277 decks
15%synergy
Stillness in Motion
15%inclusion34 decks223 decks
15%synergy
Extravagant Replication
15%inclusion42 decks277 decks
10%synergy
Timely Ward
15%inclusion41 decks277 decks
10%synergy
Defiled Crypt // Cadaver Lab
14%inclusion40 decks277 decks
14%synergy
Trouble in Pairs
14%inclusion39 decks277 decks
9%synergy
Phyrexian Arena
14%inclusion38 decks277 decks
0%synergy
The Tale of Tamiyo
13%inclusion36 decks277 decks
13%synergy
Sheltered by Ghosts
13%inclusion35 decks277 decks
10%synergy
Polluted Cistern // Dim Oubliette
13%inclusion35 decks277 decks
12%synergy
Copy Enchantment
12%inclusion34 decks277 decks
8%synergy
Authority of the Consuls
12%inclusion33 decks277 decks
0%synergy
Enchanted Evening
12%inclusion33 decks277 decks
10%synergy
Mirror Room // Fractured Realm
12%inclusion32 decks277 decks
9%synergy
Ethereal Armor
11%inclusion31 decks277 decks
7%synergy
Aura of Silence
11%inclusion31 decks277 decks
8%synergy
Bottomless Pool // Locker Room
11%inclusion31 decks277 decks
9%synergy
Land Tax
11%inclusion31 decks277 decks
5%synergy
The Eldest Reborn
11%inclusion30 decks277 decks
8%synergy
Restricted Office // Lecture Hall
11%inclusion30 decks277 decks
9%synergy
Hallowed Haunting
11%inclusion30 decks277 decks
8%synergy
Imprisoned in the Moon
10%inclusion29 decks277 decks
4%synergy
Central Elevator // Promising Stairs
10%inclusion29 decks277 decks
10%synergy
One with the Multiverse
10%inclusion27 decks277 decks
5%synergy
Court of Cunning
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 decks227 decks
8%synergy
Planeswalkers
Teferi, Time Raveler
21%inclusion58 decks277 decks
13%synergy
Utility Lands
Hall of Heliod's Generosity
55%inclusion151 decks277 decks
41%synergy
Otawara, Soaring City
36%inclusion99 decks277 decks
17%synergy
Bojuka Bog
35%inclusion97 decks277 decks
8%synergy
Takenuma, Abandoned Mire
19%inclusion53 decks277 decks
13%synergy
Urza's Saga
18%inclusion51 decks277 decks
7%synergy
Serra's Sanctum
17%inclusion48 decks277 decks
16%synergy
Reliquary Tower
13%inclusion37 decks277 decks
-21%synergy
Cephalid Coliseum
13%inclusion37 decks277 decks
10%synergy
Urborg, Tomb of Yawgmoth
13%inclusion37 decks277 decks
0%synergy
Emergence Zone
13%inclusion36 decks277 decks
11%synergy
Halimar Depths
10%inclusion28 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%inclusion259 decks277 decks
4%synergy
Arcane Signet
92%inclusion255 decks277 decks
4%synergy
Talisman of Dominance
55%inclusion153 decks277 decks
6%synergy
Talisman of Hierarchy
50%inclusion139 decks277 decks
6%synergy
Talisman of Progress
49%inclusion137 decks277 decks
6%synergy
Fellwar Stone
42%inclusion115 decks277 decks
8%synergy
Azorius Signet
36%inclusion100 decks277 decks
5%synergy
Orzhov Signet
33%inclusion91 decks277 decks
0%synergy
Lotus Petal
24%inclusion66 decks277 decks
13%synergy
Mana Vault
23%inclusion65 decks277 decks
14%synergy
Dimir Signet
23%inclusion64 decks277 decks
-8%synergy
Chrome Mox
19%inclusion54 decks277 decks
10%synergy
Mind Stone
13%inclusion35 decks277 decks
0%synergy
Mox Opal
12%inclusion34 decks277 decks
4%synergy
Mox Amber
11%inclusion31 decks277 decks
5%synergy
Mox Diamond
10%inclusion29 decks277 decks
3%synergy
Lion's Eye Diamond
9.0%inclusion25 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
90%inclusion250 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
63%inclusion175 decks277 decks
12%synergy
Flooded Strand
59%inclusion164 decks277 decks
21%synergy
Polluted Delta
58%inclusion160 decks277 decks
20%synergy
Marsh Flats
55%inclusion151 decks277 decks
18%synergy
Exotic Orchard
53%inclusion148 decks277 decks
-5%synergy
Raffine's Tower
49%inclusion135 decks277 decks
8%synergy
Caves of Koilos
48%inclusion134 decks277 decks
13%synergy
Adarkar Wastes
47%inclusion131 decks277 decks
16%synergy
Underground River
47%inclusion130 decks277 decks
13%synergy
Sea of Clouds
44%inclusion122 decks277 decks
9%synergy
Arcane Sanctum
44%inclusion121 decks277 decks
-11%synergy
Morphic Pool
42%inclusion115 decks277 decks
8%synergy
Undercity Sewers
41%inclusion114 decks277 decks
27%synergy
Vault of Champions
40%inclusion112 decks277 decks
8%synergy
Glacial Fortress
35%inclusion97 decks277 decks
-7%synergy
Shadowy Backstreet
35%inclusion96 decks277 decks
22%synergy
Meticulous Archive
35%inclusion96 decks277 decks
21%synergy
Isolated Chapel
30%inclusion82 decks277 decks
-11%synergy
Tundra
26%inclusion72 decks277 decks
10%synergy
City of Brass
26%inclusion71 decks277 decks
11%synergy
Underground Sea
25%inclusion69 decks277 decks
9%synergy
Scrubland
25%inclusion69 decks277 decks
9%synergy
Drowned Catacomb
23%inclusion64 decks277 decks
-14%synergy
Floodfarm Verge
23%inclusion64 decks277 decks
12%synergy
Azorius Chancery
23%inclusion63 decks277 decks
9%synergy
Prairie Stream
22%inclusion62 decks277 decks
-18%synergy
Bloodstained Mire
22%inclusion61 decks277 decks
11%synergy
Tainted Isle
22%inclusion60 decks277 decks
15%synergy
Gloomlake Verge
21%inclusion59 decks277 decks
10%synergy
Dimir Aqueduct
21%inclusion58 decks277 decks
8%synergy
Sunken Hollow
21%inclusion57 decks277 decks
-19%synergy
Tainted Field
20%inclusion56 decks277 decks
13%synergy
Valgavoth's Lair
20%inclusion56 decks277 decks
18%synergy
Mana Confluence
20%inclusion56 decks277 decks
6%synergy
Orzhov Basilica
20%inclusion56 decks277 decks
5%synergy
Temple of Deceit
20%inclusion55 decks277 decks
2%synergy
Temple of Silence
20%inclusion55 decks277 decks
1%synergy
Temple of Enlightenment
20%inclusion55 decks277 decks
4%synergy
Misty Rainforest
19%inclusion54 decks277 decks
9%synergy
Windswept Heath
19%inclusion54 decks277 decks
10%synergy
Verdant Catacombs
19%inclusion53 decks277 decks
9%synergy
Sink into Stupor
18%inclusion51 decks277 decks
6%synergy
Scalding Tarn
18%inclusion50 decks277 decks
7%synergy
Evolving Wilds
17%inclusion48 decks277 decks
-8%synergy
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