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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Utility Artifacts
Enchantments
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Utility Lands
Mana Artifacts
Lands
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Wan Shi Tong, Librarian
11%inclusion6 decks54 decks
6%synergy
Benevolent River Spirit
2.1%inclusion1 decks47 decks
2%synergy
Dutiful Knowledge Seeker
2.1%inclusion1 decks47 decks
2%synergy
Koh, the Face Stealer
2.1%inclusion1 decks47 decks
2%synergy
Bender's Waterskin
2.1%inclusion2 decks95 decks
-1%synergy
High Synergy Cards
Animate Dead
77%inclusion192 decks249 decks
67%synergy
Ripples of Undeath
67%inclusion167 decks249 decks
64%synergy
Necromancy
68%inclusion170 decks249 decks
64%synergy
Dress Down
62%inclusion155 decks249 decks
60%synergy
Abdel Adrian, Gorion's Ward
52%inclusion129 decks249 decks
50%synergy
Inquisitive Glimmer
57%inclusion143 decks249 decks
50%synergy
Mystic Remora
71%inclusion177 decks249 decks
50%synergy
Entomb
55%inclusion138 decks249 decks
49%synergy
Entity Tracker
54%inclusion135 decks249 decks
48%synergy
Sevinne's Reclamation
56%inclusion140 decks249 decks
47%synergy
Top Cards
Swords to Plowshares
62%inclusion154 decks249 decks
-6%synergy
Mesa Enchantress
53%inclusion133 decks249 decks
44%synergy
Mirrormade
50%inclusion124 decks249 decks
40%synergy
Blind Obedience
47%inclusion118 decks249 decks
35%synergy
Starfield Mystic
45%inclusion113 decks249 decks
39%synergy
Gravebreaker Lamia
44%inclusion110 decks249 decks
43%synergy
Dark Ritual
44%inclusion109 decks249 decks
25%synergy
Dance of the Dead
43%inclusion108 decks249 decks
41%synergy
Amphibian Downpour
43%inclusion107 decks249 decks
38%synergy
An Offer You Can't Refuse
42%inclusion105 decks249 decks
16%synergy
Game Changers
Rhystic Study
65%inclusion163 decks249 decks
33%synergy
Smothering Tithe
62%inclusion154 decks249 decks
30%synergy
Enlightened Tutor
51%inclusion127 decks249 decks
31%synergy
Demonic Tutor
46%inclusion114 decks249 decks
24%synergy
Vampiric Tutor
39%inclusion98 decks249 decks
21%synergy
Cyclonic Rift
33%inclusion83 decks249 decks
9%synergy
Fierce Guardianship
31%inclusion78 decks249 decks
11%synergy
Thassa's Oracle
31%inclusion77 decks249 decks
21%synergy
Ancient Tomb
31%inclusion76 decks249 decks
17%synergy
Necropotence
27%inclusion68 decks249 decks
20%synergy
Creatures
Demon of Fate's Design
42%inclusion105 decks249 decks
37%synergy
Scrabbling Skullcrab
41%inclusion101 decks249 decks
40%synergy
Overlord of the Balemurk
37%inclusion93 decks249 decks
35%synergy
Esper Sentinel
37%inclusion92 decks249 decks
9%synergy
Overlord of the Floodpits
37%inclusion91 decks249 decks
33%synergy
Ondu Spiritdancer
36%inclusion90 decks249 decks
30%synergy
Fear of Impostors
36%inclusion89 decks249 decks
34%synergy
Doomwake Giant
35%inclusion86 decks249 decks
29%synergy
Fear of Sleep Paralysis
35%inclusion86 decks249 decks
29%synergy
Zur, Eternal Schemer
31%inclusion76 decks249 decks
27%synergy
Victor, Valgavoth's Seneschal
30%inclusion74 decks249 decks
28%synergy
Grand Abolisher
29%inclusion71 decks249 decks
14%synergy
Lotho, Corrupt Shirriff
28%inclusion70 decks249 decks
11%synergy
Zur the Enchanter
24%inclusion60 decks249 decks
19%synergy
Orcish Bowmasters
23%inclusion57 decks249 decks
12%synergy
Heliod, the Radiant Dawn
22%inclusion56 decks249 decks
19%synergy
Hullbreaker Horror
22%inclusion56 decks249 decks
16%synergy
Grim Guardian
22%inclusion55 decks249 decks
19%synergy
Ledger Shredder
21%inclusion52 decks249 decks
12%synergy
Valley Floodcaller
20%inclusion51 decks249 decks
16%synergy
Displacer Kitten
20%inclusion49 decks249 decks
12%synergy
Moon-Blessed Cleric
19%inclusion48 decks249 decks
15%synergy
Ghostly Dancers
18%inclusion46 decks249 decks
16%synergy
Enduring Curiosity
18%inclusion45 decks249 decks
10%synergy
Soaring Lightbringer
17%inclusion43 decks249 decks
12%synergy
Silent Hallcreeper
17%inclusion43 decks249 decks
13%synergy
Lurrus of the Dream-Den
15%inclusion38 decks249 decks
14%synergy
Balemurk Leech
15%inclusion38 decks249 decks
15%synergy
Aminatou, Veil Piercer
14%inclusion36 decks249 decks
13%synergy
Hedron Crab
14%inclusion35 decks249 decks
13%synergy
Opposition Agent
13%inclusion33 decks249 decks
4%synergy
Ranger-Captain of Eos
12%inclusion30 decks249 decks
6%synergy
Psychic Frog
12%inclusion30 decks249 decks
5%synergy
Gremlin Tamer
12%inclusion29 decks249 decks
11%synergy
Archon of Sun's Grace
12%inclusion29 decks249 decks
7%synergy
Talion, the Kindly Lord
11%inclusion28 decks249 decks
3%synergy
Archetype of Imagination
11%inclusion27 decks249 decks
6%synergy
Drannith Magistrate
10%inclusion26 decks249 decks
2%synergy
Mindwrack Harpy
10%inclusion26 decks249 decks
10%synergy
Archivist of Oghma
10%inclusion25 decks249 decks
3%synergy
Overlord of the Mistmoors
10%inclusion24 decks249 decks
7%synergy
Skullsnap Nuisance
8.8%inclusion22 decks249 decks
8%synergy
Athreos, Shroud-Veiled
8.8%inclusion22 decks249 decks
4%synergy
Ancient Cellarspawn
8.8%inclusion22 decks249 decks
5%synergy
Faerie Mastermind
8.8%inclusion22 decks249 decks
-1%synergy
Voice of Victory
8.6%inclusion17 decks198 decks
0%synergy
Laboratory Maniac
8.0%inclusion20 decks249 decks
5%synergy
Mockingbird
8.0%inclusion20 decks249 decks
4%synergy
Phyrexian Metamorph
7.6%inclusion19 decks249 decks
-1%synergy
Leonin Relic-Warder
7.6%inclusion19 decks249 decks
7%synergy
Instants
Path to Exile
34%inclusion84 decks249 decks
-8%synergy
Swan Song
31%inclusion77 decks249 decks
12%synergy
Counterspell
30%inclusion74 decks249 decks
-12%synergy
Arcane Denial
29%inclusion73 decks249 decks
9%synergy
Mana Drain
28%inclusion70 decks249 decks
11%synergy
Silence
24%inclusion60 decks249 decks
14%synergy
Force of Will
24%inclusion60 decks249 decks
11%synergy
Mystical Tutor
24%inclusion60 decks249 decks
12%synergy
Force of Negation
20%inclusion50 decks249 decks
8%synergy
Flusterstorm
19%inclusion48 decks249 decks
11%synergy
Sink into Stupor
19%inclusion47 decks249 decks
6%synergy
Dovin's Veto
18%inclusion46 decks249 decks
-6%synergy
Intuition
18%inclusion44 decks249 decks
16%synergy
Demonic Consultation
18%inclusion44 decks249 decks
9%synergy
Gifts Ungiven
17%inclusion43 decks249 decks
15%synergy
Teferi's Protection
15%inclusion37 decks249 decks
-2%synergy
Borne Upon a Wind
15%inclusion37 decks249 decks
10%synergy
Tainted Pact
14%inclusion36 decks249 decks
7%synergy
Cabal Ritual
14%inclusion35 decks249 decks
11%synergy
Pact of Negation
14%inclusion35 decks249 decks
6%synergy
Inkshield
14%inclusion34 decks249 decks
5%synergy
Brainstorm
13%inclusion33 decks249 decks
-4%synergy
Frantic Search
13%inclusion33 decks249 decks
-4%synergy
Mindbreak Trap
12%inclusion29 decks249 decks
5%synergy
Thirst for Meaning
11%inclusion28 decks249 decks
10%synergy
Void Rend
11%inclusion28 decks249 decks
-22%synergy
Mental Misstep
10%inclusion25 decks249 decks
3%synergy
Otherworldly Gaze
10%inclusion25 decks249 decks
8%synergy
Into the Flood Maw
8.8%inclusion22 decks249 decks
5%synergy
Anguished Unmaking
7.6%inclusion19 decks249 decks
-17%synergy
Negate
7.6%inclusion19 decks249 decks
-9%synergy
Fell the Profane
7.6%inclusion19 decks249 decks
-1%synergy
Deadly Rollick
6.8%inclusion17 decks249 decks
-7%synergy
Muddle the Mixture
6.8%inclusion17 decks249 decks
3%synergy
Utter End
6.4%inclusion16 decks249 decks
-1%synergy
Chain of Vapor
6.0%inclusion15 decks249 decks
3%synergy
Waterlogged Teachings
6.0%inclusion15 decks249 decks
2%synergy
Retraction Helix
5.6%inclusion14 decks249 decks
5%synergy
Ad Nauseam
5.6%inclusion14 decks249 decks
3%synergy
Delay
5.6%inclusion14 decks249 decks
3%synergy
Dispel
5.2%inclusion13 decks249 decks
2%synergy
Brain Freeze
5.2%inclusion13 decks249 decks
5%synergy
Sorceries
Windfall
29%inclusion72 decks249 decks
15%synergy
Reanimate
27%inclusion66 decks249 decks
11%synergy
Redress Fate
24%inclusion61 decks249 decks
18%synergy
Toxic Deluge
21%inclusion53 decks249 decks
2%synergy
Singularity Rupture
15%inclusion17 decks112 decks
13%synergy
Demonic Counsel
13%inclusion33 decks249 decks
12%synergy
Lively Dirge
12%inclusion30 decks249 decks
11%synergy
Damn
12%inclusion30 decks249 decks
-8%synergy
Glimpse the Unthinkable
12%inclusion29 decks249 decks
11%synergy
Idyllic Tutor
12%inclusion29 decks249 decks
7%synergy
Imperial Seal
11%inclusion28 decks249 decks
4%synergy
Supreme Verdict
11%inclusion28 decks249 decks
-4%synergy
Extinguish All Hope
10%inclusion26 decks249 decks
9%synergy
Unmarked Grave
10%inclusion24 decks249 decks
8%synergy
Beseech the Mirror
8.8%inclusion22 decks249 decks
5%synergy
Dance of the Manse
8.4%inclusion21 decks249 decks
5%synergy
Replenish
8.4%inclusion21 decks249 decks
7%synergy
Time Wipe
7.2%inclusion18 decks249 decks
0%synergy
Buried Alive
7.2%inclusion18 decks249 decks
3%synergy
Resurgent Belief
6.8%inclusion17 decks249 decks
5%synergy
Farewell
6.4%inclusion16 decks249 decks
-7%synergy
Ponder
6.0%inclusion15 decks249 decks
-3%synergy
Terminus
5.6%inclusion14 decks249 decks
1%synergy
Utility Artifacts
The One Ring
26%inclusion64 decks249 decks
12%synergy
Mesmeric Orb
20%inclusion51 decks249 decks
19%synergy
Wishclaw Talisman
19%inclusion48 decks249 decks
11%synergy
Lightning Greaves
8.0%inclusion20 decks249 decks
-14%synergy
Sensei's Divining Top
6.4%inclusion16 decks249 decks
-3%synergy
Cloud Key
5.6%inclusion14 decks249 decks
2%synergy
Enchantments
Sphere of Safety
41%inclusion103 decks249 decks
32%synergy
Secret Arcade // Dusty Parlor
39%inclusion97 decks249 decks
34%synergy
Propaganda
38%inclusion95 decks249 decks
12%synergy
Ghostly Prison
34%inclusion85 decks249 decks
13%synergy
Seal of Cleansing
32%inclusion79 decks249 decks
30%synergy
Grasp of Fate
31%inclusion77 decks249 decks
25%synergy
The Meathook Massacre
29%inclusion73 decks249 decks
26%synergy
Tinybones Joins Up
29%inclusion72 decks249 decks
28%synergy
Sigil of the Empty Throne
26%inclusion65 decks249 decks
20%synergy
Starfield of Nyx
26%inclusion65 decks249 decks
22%synergy
Cemetery Tampering
24%inclusion60 decks249 decks
23%synergy
Estrid's Invocation
24%inclusion59 decks249 decks
19%synergy
Touch the Spirit Realm
21%inclusion52 decks249 decks
18%synergy
Static Prison
21%inclusion52 decks249 decks
20%synergy
Monologue Tax
20%inclusion50 decks249 decks
14%synergy
Greater Auramancy
20%inclusion50 decks249 decks
16%synergy
Cacophony Unleashed
20%inclusion49 decks249 decks
18%synergy
Darksteel Mutation
19%inclusion47 decks249 decks
13%synergy
Black Market Connections
18%inclusion44 decks249 decks
4%synergy
Seal of Removal
18%inclusion44 decks249 decks
17%synergy
Shark Typhoon
17%inclusion42 decks249 decks
11%synergy
Out of the Tombs
16%inclusion40 decks249 decks
16%synergy
Extravagant Replication
16%inclusion39 decks249 decks
11%synergy
Leyline of Anticipation
16%inclusion39 decks249 decks
11%synergy
Trouble in Pairs
15%inclusion38 decks249 decks
10%synergy
Phyrexian Arena
14%inclusion36 decks249 decks
0%synergy
The Tale of Tamiyo
14%inclusion35 decks249 decks
14%synergy
Defiled Crypt // Cadaver Lab
14%inclusion35 decks249 decks
13%synergy
Stillness in Motion
14%inclusion26 decks190 decks
13%synergy
Timely Ward
14%inclusion34 decks249 decks
9%synergy
Authority of the Consuls
12%inclusion31 decks249 decks
1%synergy
Polluted Cistern // Dim Oubliette
12%inclusion31 decks249 decks
12%synergy
Land Tax
12%inclusion30 decks249 decks
6%synergy
Imprisoned in the Moon
12%inclusion29 decks249 decks
5%synergy
Enchanted Evening
12%inclusion29 decks249 decks
10%synergy
Aura of Silence
12%inclusion29 decks249 decks
8%synergy
Sheltered by Ghosts
12%inclusion29 decks249 decks
9%synergy
Mirror Room // Fractured Realm
11%inclusion28 decks249 decks
9%synergy
Copy Enchantment
11%inclusion27 decks249 decks
6%synergy
Restricted Office // Lecture Hall
11%inclusion27 decks249 decks
9%synergy
Bottomless Pool // Locker Room
11%inclusion27 decks249 decks
9%synergy
Hallowed Haunting
11%inclusion27 decks249 decks
8%synergy
The Eldest Reborn
10%inclusion26 decks249 decks
8%synergy
Teval's Judgment
10%inclusion20 decks195 decks
9%synergy
One with the Multiverse
10%inclusion24 decks249 decks
5%synergy
Oubliette
10%inclusion24 decks249 decks
8%synergy
Court of Cunning
10%inclusion24 decks249 decks
9%synergy
Ethereal Armor
10%inclusion24 decks249 decks
5%synergy
Central Elevator // Promising Stairs
9.2%inclusion23 decks249 decks
9%synergy
All That Glitters
8.8%inclusion22 decks249 decks
0%synergy
Planeswalkers
Teferi, Time Raveler
21%inclusion52 decks249 decks
12%synergy
Utility Lands
Hall of Heliod's Generosity
57%inclusion141 decks249 decks
43%synergy
Otawara, Soaring City
36%inclusion90 decks249 decks
17%synergy
Bojuka Bog
35%inclusion88 decks249 decks
8%synergy
Takenuma, Abandoned Mire
20%inclusion49 decks249 decks
13%synergy
Urza's Saga
19%inclusion47 decks249 decks
7%synergy
Serra's Sanctum
18%inclusion44 decks249 decks
16%synergy
Urborg, Tomb of Yawgmoth
14%inclusion36 decks249 decks
1%synergy
Reliquary Tower
14%inclusion35 decks249 decks
-20%synergy
Cephalid Coliseum
14%inclusion34 decks249 decks
10%synergy
Emergence Zone
12%inclusion30 decks249 decks
10%synergy
Halimar Depths
10%inclusion26 decks249 decks
6%synergy
Minamo, School at Water's Edge
7.2%inclusion18 decks249 decks
3%synergy
Eiganjo, Seat of the Empire
5.6%inclusion14 decks249 decks
0%synergy
Cabal Coffers
5.2%inclusion13 decks249 decks
2%synergy
Rogue's Passage
5.2%inclusion13 decks249 decks
-4%synergy
Mana Artifacts
Sol Ring
93%inclusion231 decks249 decks
3%synergy
Arcane Signet
92%inclusion228 decks249 decks
4%synergy
Talisman of Dominance
57%inclusion141 decks249 decks
8%synergy
Talisman of Progress
51%inclusion126 decks249 decks
8%synergy
Talisman of Hierarchy
50%inclusion124 decks249 decks
7%synergy
Fellwar Stone
42%inclusion105 decks249 decks
8%synergy
Azorius Signet
36%inclusion89 decks249 decks
3%synergy
Orzhov Signet
31%inclusion78 decks249 decks
-3%synergy
Mana Vault
23%inclusion58 decks249 decks
14%synergy
Dimir Signet
23%inclusion58 decks249 decks
-9%synergy
Lotus Petal
23%inclusion57 decks249 decks
12%synergy
Chrome Mox
19%inclusion48 decks249 decks
10%synergy
Mind Stone
13%inclusion33 decks249 decks
0%synergy
Mox Opal
11%inclusion28 decks249 decks
2%synergy
Mox Diamond
11%inclusion28 decks249 decks
4%synergy
Lion's Eye Diamond
10%inclusion25 decks249 decks
8%synergy
Mox Amber
10%inclusion24 decks249 decks
4%synergy
Commander's Sphere
8.0%inclusion20 decks249 decks
-11%synergy
Thought Vessel
7.6%inclusion19 decks249 decks
-17%synergy
Basalt Monolith
5.2%inclusion13 decks249 decks
3%synergy
Lands
Command Tower
95%inclusion237 decks249 decks
3%synergy
Island
90%inclusion225 decks249 decks
-2%synergy
Swamp
90%inclusion224 decks249 decks
-1%synergy
Plains
89%inclusion222 decks249 decks
-2%synergy
Watery Grave
65%inclusion161 decks249 decks
15%synergy
Hallowed Fountain
64%inclusion159 decks249 decks
15%synergy
Godless Shrine
63%inclusion156 decks249 decks
13%synergy
Polluted Delta
59%inclusion147 decks249 decks
22%synergy
Flooded Strand
59%inclusion146 decks249 decks
21%synergy
Marsh Flats
55%inclusion138 decks249 decks
19%synergy
Exotic Orchard
51%inclusion128 decks249 decks
-7%synergy
Raffine's Tower
49%inclusion123 decks249 decks
8%synergy
Caves of Koilos
47%inclusion116 decks249 decks
11%synergy
Adarkar Wastes
45%inclusion112 decks249 decks
14%synergy
Underground River
45%inclusion111 decks249 decks
12%synergy
Sea of Clouds
44%inclusion110 decks249 decks
8%synergy
Arcane Sanctum
43%inclusion108 decks249 decks
-11%synergy
Morphic Pool
42%inclusion105 decks249 decks
8%synergy
Vault of Champions
41%inclusion102 decks249 decks
8%synergy
Undercity Sewers
40%inclusion99 decks249 decks
26%synergy
Shadowy Backstreet
35%inclusion88 decks249 decks
23%synergy
Meticulous Archive
35%inclusion87 decks249 decks
21%synergy
Glacial Fortress
35%inclusion87 decks249 decks
-5%synergy
Isolated Chapel
31%inclusion76 decks249 decks
-8%synergy
Tundra
26%inclusion64 decks249 decks
10%synergy
Underground Sea
24%inclusion61 decks249 decks
9%synergy
Drowned Catacomb
24%inclusion61 decks249 decks
-11%synergy
City of Brass
24%inclusion61 decks249 decks
9%synergy
Scrubland
24%inclusion61 decks249 decks
9%synergy
Azorius Chancery
23%inclusion58 decks249 decks
9%synergy
Prairie Stream
23%inclusion57 decks249 decks
-18%synergy
Floodfarm Verge
22%inclusion55 decks249 decks
11%synergy
Bloodstained Mire
22%inclusion54 decks249 decks
11%synergy
Gloomlake Verge
21%inclusion53 decks249 decks
10%synergy
Dimir Aqueduct
21%inclusion53 decks249 decks
7%synergy
Orzhov Basilica
21%inclusion52 decks249 decks
5%synergy
Sunken Hollow
21%inclusion52 decks249 decks
-19%synergy
Valgavoth's Lair
20%inclusion51 decks249 decks
18%synergy
Tainted Isle
20%inclusion51 decks249 decks
14%synergy
Mana Confluence
20%inclusion51 decks249 decks
7%synergy
Misty Rainforest
20%inclusion50 decks249 decks
9%synergy
Temple of Deceit
20%inclusion49 decks249 decks
1%synergy
Temple of Silence
19%inclusion48 decks249 decks
0%synergy
Windswept Heath
19%inclusion48 decks249 decks
9%synergy
Tainted Field
19%inclusion48 decks249 decks
12%synergy
Verdant Catacombs
19%inclusion47 decks249 decks
9%synergy
Sink into Stupor
19%inclusion47 decks249 decks
6%synergy
Temple of Enlightenment
19%inclusion47 decks249 decks
2%synergy
Scalding Tarn
18%inclusion46 decks249 decks
7%synergy
Terramorphic Expanse
18%inclusion45 decks249 decks
1%synergy
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