The Master of Keys (Commander) - Optimized

The Master of Keys
Rank #300
350decks
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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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Instants
Sorceries
Utility Artifacts
Enchantments
Planeswalkers
Utility Lands
Mana Artifacts
Lands
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Super Intelligence
3.7%inclusion2 decks54 decks
3%synergy
Gleaming Bastion
3.6%inclusion2 decks55 decks
2%synergy
Archnemesis
2.0%inclusion1 decks50 decks
2%synergy
Cosmic Cube
1.9%inclusion1 decks54 decks
2%synergy
Doctor Doom, Unrivaled
1.9%inclusion1 decks54 decks
2%synergy
High Synergy Cards
Ripples of Undeath
70%inclusion244 decks350 decks
67%synergy
Animate Dead
76%inclusion267 decks350 decks
67%synergy
Necromancy
67%inclusion233 decks350 decks
62%synergy
Dress Down
63%inclusion219 decks350 decks
60%synergy
Inquisitive Glimmer
59%inclusion208 decks350 decks
52%synergy
Entomb
58%inclusion204 decks350 decks
52%synergy
Abdel Adrian, Gorion's Ward
52%inclusion183 decks350 decks
51%synergy
Mystic Remora
71%inclusion247 decks350 decks
50%synergy
Entity Tracker
52%inclusion183 decks350 decks
46%synergy
Gravebreaker Lamia
47%inclusion164 decks350 decks
46%synergy
Top Cards
Swords to Plowshares
63%inclusion221 decks350 decks
-5%synergy
Sevinne's Reclamation
54%inclusion188 decks350 decks
45%synergy
Mesa Enchantress
52%inclusion182 decks350 decks
43%synergy
Mirrormade
50%inclusion176 decks350 decks
40%synergy
Starfield Mystic
48%inclusion169 decks350 decks
42%synergy
Dark Ritual
46%inclusion160 decks350 decks
25%synergy
Dance of the Dead
45%inclusion158 decks350 decks
43%synergy
Scrabbling Skullcrab
43%inclusion152 decks350 decks
42%synergy
Demon of Fate's Design
43%inclusion152 decks350 decks
38%synergy
Amphibian Downpour
43%inclusion150 decks350 decks
38%synergy
Game Changers
Smothering Tithe
65%inclusion226 decks350 decks
34%synergy
Rhystic Study
63%inclusion222 decks350 decks
33%synergy
Enlightened Tutor
50%inclusion175 decks350 decks
31%synergy
Demonic Tutor
43%inclusion150 decks350 decks
23%synergy
Vampiric Tutor
37%inclusion129 decks350 decks
20%synergy
Thassa's Oracle
34%inclusion118 decks350 decks
25%synergy
Cyclonic Rift
31%inclusion108 decks350 decks
8%synergy
Fierce Guardianship
30%inclusion105 decks350 decks
10%synergy
Necropotence
29%inclusion101 decks350 decks
22%synergy
Ancient Tomb
29%inclusion100 decks350 decks
16%synergy
Creatures
Overlord of the Balemurk
39%inclusion136 decks350 decks
37%synergy
Ondu Spiritdancer
38%inclusion133 decks350 decks
32%synergy
Esper Sentinel
36%inclusion125 decks350 decks
9%synergy
Doomwake Giant
36%inclusion125 decks350 decks
30%synergy
Fear of Sleep Paralysis
35%inclusion122 decks350 decks
30%synergy
Overlord of the Floodpits
34%inclusion120 decks350 decks
31%synergy
Fear of Impostors
31%inclusion110 decks350 decks
30%synergy
Zur, Eternal Schemer
31%inclusion109 decks350 decks
28%synergy
Lotho, Corrupt Shirriff
30%inclusion105 decks350 decks
13%synergy
Grand Abolisher
30%inclusion104 decks350 decks
15%synergy
Victor, Valgavoth's Seneschal
28%inclusion99 decks350 decks
26%synergy
Zur the Enchanter
24%inclusion83 decks350 decks
19%synergy
Hullbreaker Horror
23%inclusion81 decks350 decks
17%synergy
Grim Guardian
22%inclusion78 decks350 decks
20%synergy
Orcish Bowmasters
21%inclusion74 decks350 decks
11%synergy
Heliod, the Radiant Dawn
21%inclusion73 decks350 decks
17%synergy
Valley Floodcaller
20%inclusion70 decks350 decks
16%synergy
Displacer Kitten
19%inclusion68 decks350 decks
13%synergy
Moon-Blessed Cleric
19%inclusion68 decks350 decks
15%synergy
Ghostly Dancers
19%inclusion65 decks350 decks
16%synergy
Ledger Shredder
19%inclusion65 decks350 decks
10%synergy
Soaring Lightbringer
18%inclusion64 decks350 decks
14%synergy
Silent Hallcreeper
18%inclusion64 decks350 decks
14%synergy
Enduring Curiosity
17%inclusion60 decks350 decks
9%synergy
Lurrus of the Dream-Den
17%inclusion59 decks350 decks
15%synergy
Aminatou, Veil Piercer
16%inclusion57 decks350 decks
15%synergy
Hedron Crab
14%inclusion48 decks350 decks
13%synergy
Archon of Sun's Grace
13%inclusion45 decks350 decks
9%synergy
Balemurk Leech
13%inclusion45 decks350 decks
12%synergy
Opposition Agent
13%inclusion44 decks350 decks
5%synergy
Ranger-Captain of Eos
12%inclusion42 decks350 decks
6%synergy
Gremlin Tamer
12%inclusion41 decks350 decks
11%synergy
Psychic Frog
11%inclusion40 decks350 decks
4%synergy
Archetype of Imagination
11%inclusion39 decks350 decks
6%synergy
Faerie Mastermind
11%inclusion39 decks350 decks
1%synergy
Mindwrack Harpy
11%inclusion38 decks350 decks
11%synergy
Voice of Victory
11%inclusion33 decks304 decks
2%synergy
Drannith Magistrate
10%inclusion36 decks350 decks
3%synergy
Talion, the Kindly Lord
10%inclusion36 decks350 decks
3%synergy
Skullsnap Nuisance
10%inclusion34 decks350 decks
9%synergy
Wan Shi Tong, Librarian
9.5%inclusion17 decks179 decks
5%synergy
Leonin Relic-Warder
9.1%inclusion32 decks350 decks
9%synergy
Mockingbird
9.1%inclusion32 decks350 decks
5%synergy
Ancient Cellarspawn
8.9%inclusion31 decks350 decks
6%synergy
Athreos, Shroud-Veiled
8.6%inclusion30 decks350 decks
4%synergy
Archivist of Oghma
8.3%inclusion29 decks350 decks
2%synergy
Sage of Mysteries
8.3%inclusion29 decks350 decks
8%synergy
Overlord of the Mistmoors
8.3%inclusion29 decks350 decks
6%synergy
Laboratory Maniac
8.0%inclusion28 decks350 decks
5%synergy
Eiganjo Dynastorian
7.6%inclusion8 decks105 decks
6%synergy
Instants
An Offer You Can't Refuse
41%inclusion143 decks350 decks
13%synergy
Path to Exile
35%inclusion121 decks350 decks
-8%synergy
Swan Song
32%inclusion111 decks350 decks
12%synergy
Counterspell
30%inclusion106 decks350 decks
-12%synergy
Arcane Denial
29%inclusion100 decks350 decks
8%synergy
Force of Will
26%inclusion92 decks350 decks
14%synergy
Mana Drain
26%inclusion90 decks350 decks
8%synergy
Silence
25%inclusion89 decks350 decks
15%synergy
Mystical Tutor
24%inclusion85 decks350 decks
14%synergy
Force of Negation
21%inclusion75 decks350 decks
10%synergy
Dovin's Veto
21%inclusion74 decks350 decks
-5%synergy
Demonic Consultation
20%inclusion69 decks350 decks
12%synergy
Gifts Ungiven
19%inclusion68 decks350 decks
17%synergy
Flusterstorm
19%inclusion67 decks350 decks
11%synergy
Sink into Stupor
19%inclusion65 decks350 decks
5%synergy
Intuition
17%inclusion58 decks350 decks
15%synergy
Cabal Ritual
17%inclusion58 decks350 decks
13%synergy
Tainted Pact
15%inclusion53 decks350 decks
9%synergy
Borne Upon a Wind
15%inclusion52 decks350 decks
10%synergy
Brainstorm
14%inclusion50 decks350 decks
-2%synergy
Teferi's Protection
14%inclusion48 decks350 decks
-2%synergy
Frantic Search
13%inclusion44 decks350 decks
-6%synergy
Void Rend
12%inclusion43 decks350 decks
-23%synergy
Thirst for Meaning
12%inclusion42 decks350 decks
11%synergy
Inkshield
12%inclusion42 decks350 decks
2%synergy
Pact of Negation
12%inclusion42 decks350 decks
5%synergy
Mindbreak Trap
11%inclusion40 decks350 decks
5%synergy
Otherworldly Gaze
10%inclusion36 decks350 decks
8%synergy
Mental Misstep
10%inclusion34 decks350 decks
3%synergy
Into the Flood Maw
10%inclusion34 decks350 decks
6%synergy
Fell the Profane
8.3%inclusion29 decks350 decks
-1%synergy
Negate
8.3%inclusion29 decks350 decks
-8%synergy
Anguished Unmaking
8.0%inclusion28 decks350 decks
-18%synergy
Deadly Rollick
7.7%inclusion27 decks350 decks
-8%synergy
Chain of Vapor
6.9%inclusion24 decks350 decks
4%synergy
Utter End
6.6%inclusion23 decks350 decks
0%synergy
Muddle the Mixture
6.3%inclusion22 decks350 decks
3%synergy
Ad Nauseam
6.0%inclusion21 decks350 decks
4%synergy
Culling the Weak
6.0%inclusion21 decks350 decks
4%synergy
Waterlogged Teachings
5.4%inclusion19 decks350 decks
1%synergy
Sorceries
Reanimate
31%inclusion107 decks350 decks
14%synergy
Windfall
27%inclusion96 decks350 decks
14%synergy
Redress Fate
27%inclusion93 decks350 decks
21%synergy
Toxic Deluge
21%inclusion75 decks350 decks
2%synergy
Glimpse the Unthinkable
12%inclusion43 decks350 decks
12%synergy
Demonic Counsel
12%inclusion43 decks350 decks
11%synergy
Damn
12%inclusion42 decks350 decks
-8%synergy
Lively Dirge
12%inclusion41 decks350 decks
10%synergy
Replenish
12%inclusion41 decks350 decks
10%synergy
Idyllic Tutor
11%inclusion39 decks350 decks
7%synergy
Extinguish All Hope
11%inclusion37 decks350 decks
9%synergy
Unmarked Grave
10%inclusion36 decks350 decks
9%synergy
Singularity Rupture
10%inclusion22 decks226 decks
7%synergy
Imperial Seal
10%inclusion34 decks350 decks
3%synergy
Dance of the Manse
10%inclusion34 decks350 decks
7%synergy
Supreme Verdict
9.1%inclusion32 decks350 decks
-5%synergy
Buried Alive
8.9%inclusion31 decks350 decks
5%synergy
Beseech the Mirror
8.0%inclusion28 decks350 decks
4%synergy
Ponder
7.7%inclusion27 decks350 decks
-1%synergy
Resurgent Belief
7.7%inclusion27 decks350 decks
6%synergy
Farewell
7.7%inclusion27 decks350 decks
-4%synergy
Time Wipe
6.6%inclusion23 decks350 decks
0%synergy
Utility Artifacts
Mesmeric Orb
22%inclusion78 decks350 decks
21%synergy
The One Ring
22%inclusion78 decks350 decks
10%synergy
Wishclaw Talisman
18%inclusion64 decks350 decks
11%synergy
Lightning Greaves
9.1%inclusion32 decks350 decks
-14%synergy
Cloud Key
6.9%inclusion24 decks350 decks
4%synergy
Sensei's Divining Top
5.7%inclusion20 decks350 decks
-4%synergy
Enchantments
Blind Obedience
43%inclusion149 decks350 decks
31%synergy
Sphere of Safety
41%inclusion142 decks350 decks
31%synergy
Secret Arcade // Dusty Parlor
39%inclusion137 decks350 decks
35%synergy
Propaganda
37%inclusion129 decks350 decks
7%synergy
Ghostly Prison
35%inclusion123 decks350 decks
12%synergy
Grasp of Fate
31%inclusion109 decks350 decks
25%synergy
Seal of Cleansing
31%inclusion107 decks350 decks
29%synergy
The Meathook Massacre
29%inclusion102 decks350 decks
26%synergy
Starfield of Nyx
27%inclusion95 decks350 decks
23%synergy
Tinybones Joins Up
27%inclusion94 decks350 decks
26%synergy
Estrid's Invocation
26%inclusion90 decks350 decks
21%synergy
Sigil of the Empty Throne
25%inclusion86 decks350 decks
19%synergy
Cemetery Tampering
23%inclusion82 decks350 decks
23%synergy
Monologue Tax
23%inclusion81 decks350 decks
17%synergy
Touch the Spirit Realm
21%inclusion72 decks350 decks
18%synergy
Greater Auramancy
19%inclusion68 decks350 decks
15%synergy
Darksteel Mutation
19%inclusion67 decks350 decks
13%synergy
Black Market Connections
18%inclusion64 decks350 decks
3%synergy
Cacophony Unleashed
18%inclusion63 decks350 decks
16%synergy
Seal of Removal
17%inclusion61 decks350 decks
17%synergy
Static Prison
17%inclusion58 decks350 decks
16%synergy
Leyline of Anticipation
16%inclusion55 decks350 decks
11%synergy
Shark Typhoon
16%inclusion55 decks350 decks
10%synergy
Out of the Tombs
15%inclusion54 decks350 decks
15%synergy
Extravagant Replication
15%inclusion52 decks350 decks
10%synergy
Copy Enchantment
15%inclusion51 decks350 decks
10%synergy
Defiled Crypt // Cadaver Lab
14%inclusion48 decks350 decks
13%synergy
Phyrexian Arena
13%inclusion46 decks350 decks
-1%synergy
Timely Ward
13%inclusion45 decks350 decks
8%synergy
Trouble in Pairs
13%inclusion45 decks350 decks
8%synergy
Stillness in Motion
13%inclusion38 decks297 decks
12%synergy
Sheltered by Ghosts
13%inclusion44 decks350 decks
10%synergy
Polluted Cistern // Dim Oubliette
12%inclusion43 decks350 decks
12%synergy
The Tale of Tamiyo
12%inclusion41 decks350 decks
11%synergy
Mirror Room // Fractured Realm
11%inclusion40 decks350 decks
9%synergy
Land Tax
11%inclusion40 decks350 decks
5%synergy
Restricted Office // Lecture Hall
11%inclusion39 decks350 decks
9%synergy
One with the Multiverse
11%inclusion38 decks350 decks
6%synergy
Authority of the Consuls
11%inclusion38 decks350 decks
-3%synergy
Bottomless Pool // Locker Room
11%inclusion38 decks350 decks
9%synergy
Enchanted Evening
11%inclusion38 decks350 decks
9%synergy
Imprisoned in the Moon
10%inclusion36 decks350 decks
4%synergy
Aura of Silence
10%inclusion36 decks350 decks
7%synergy
Oubliette
10%inclusion35 decks350 decks
8%synergy
Hallowed Haunting
10%inclusion35 decks350 decks
8%synergy
The Eldest Reborn
10%inclusion34 decks350 decks
7%synergy
Ethereal Armor
10%inclusion34 decks350 decks
5%synergy
Central Elevator // Promising Stairs
9.4%inclusion33 decks350 decks
9%synergy
Court of Cunning
8.6%inclusion30 decks350 decks
8%synergy
All That Glitters
8.6%inclusion30 decks350 decks
0%synergy
Planeswalkers
Teferi, Time Raveler
18%inclusion64 decks350 decks
10%synergy
Utility Lands
Hall of Heliod's Generosity
55%inclusion192 decks350 decks
42%synergy
Otawara, Soaring City
36%inclusion126 decks350 decks
17%synergy
Bojuka Bog
31%inclusion110 decks350 decks
5%synergy
Takenuma, Abandoned Mire
22%inclusion76 decks350 decks
15%synergy
Serra's Sanctum
18%inclusion63 decks350 decks
16%synergy
Urza's Saga
17%inclusion61 decks350 decks
6%synergy
Urborg, Tomb of Yawgmoth
15%inclusion52 decks350 decks
2%synergy
Cephalid Coliseum
14%inclusion48 decks350 decks
10%synergy
Emergence Zone
12%inclusion43 decks350 decks
10%synergy
Reliquary Tower
12%inclusion43 decks350 decks
-22%synergy
Halimar Depths
9.4%inclusion33 decks350 decks
5%synergy
Minamo, School at Water's Edge
6.0%inclusion21 decks350 decks
2%synergy
Eiganjo, Seat of the Empire
6.0%inclusion21 decks350 decks
1%synergy
Cabal Coffers
5.4%inclusion19 decks350 decks
2%synergy
Mana Artifacts
Sol Ring
94%inclusion330 decks350 decks
5%synergy
Arcane Signet
90%inclusion316 decks350 decks
3%synergy
Talisman of Dominance
54%inclusion190 decks350 decks
4%synergy
Talisman of Progress
51%inclusion178 decks350 decks
6%synergy
Talisman of Hierarchy
51%inclusion177 decks350 decks
6%synergy
Fellwar Stone
41%inclusion145 decks350 decks
8%synergy
Azorius Signet
35%inclusion122 decks350 decks
6%synergy
Orzhov Signet
31%inclusion108 decks350 decks
-0%synergy
Lotus Petal
25%inclusion86 decks350 decks
14%synergy
Dimir Signet
23%inclusion81 decks350 decks
-7%synergy
Mana Vault
23%inclusion79 decks350 decks
14%synergy
Chrome Mox
19%inclusion67 decks350 decks
10%synergy
Mox Amber
11%inclusion40 decks350 decks
5%synergy
Mind Stone
11%inclusion40 decks350 decks
-0%synergy
Mox Diamond
10%inclusion36 decks350 decks
4%synergy
Mox Opal
10%inclusion36 decks350 decks
2%synergy
Lion's Eye Diamond
8.0%inclusion28 decks350 decks
6%synergy
Commander's Sphere
7.4%inclusion26 decks350 decks
-10%synergy
Thought Vessel
7.4%inclusion26 decks350 decks
-18%synergy
Basalt Monolith
5.4%inclusion19 decks350 decks
3%synergy
Lands
Command Tower
95%inclusion332 decks350 decks
2%synergy
Island
90%inclusion316 decks350 decks
-3%synergy
Swamp
90%inclusion315 decks350 decks
-2%synergy
Plains
89%inclusion310 decks350 decks
-4%synergy
Hallowed Fountain
69%inclusion242 decks350 decks
18%synergy
Watery Grave
69%inclusion241 decks350 decks
17%synergy
Godless Shrine
67%inclusion236 decks350 decks
16%synergy
Flooded Strand
62%inclusion216 decks350 decks
23%synergy
Polluted Delta
60%inclusion211 decks350 decks
22%synergy
Marsh Flats
57%inclusion199 decks350 decks
21%synergy
Exotic Orchard
54%inclusion189 decks350 decks
-5%synergy
Caves of Koilos
50%inclusion176 decks350 decks
14%synergy
Underground River
50%inclusion174 decks350 decks
14%synergy
Raffine's Tower
49%inclusion172 decks350 decks
8%synergy
Adarkar Wastes
49%inclusion172 decks350 decks
16%synergy
Sea of Clouds
45%inclusion157 decks350 decks
10%synergy
Morphic Pool
42%inclusion146 decks350 decks
8%synergy
Undercity Sewers
41%inclusion145 decks350 decks
27%synergy
Arcane Sanctum
41%inclusion144 decks350 decks
-13%synergy
Vault of Champions
41%inclusion144 decks350 decks
9%synergy
Glacial Fortress
37%inclusion129 decks350 decks
-7%synergy
Shadowy Backstreet
34%inclusion120 decks350 decks
22%synergy
Meticulous Archive
34%inclusion119 decks350 decks
20%synergy
Isolated Chapel
31%inclusion110 decks350 decks
-11%synergy
City of Brass
29%inclusion102 decks350 decks
14%synergy
Drowned Catacomb
25%inclusion89 decks350 decks
-13%synergy
Tundra
25%inclusion86 decks350 decks
9%synergy
Underground Sea
24%inclusion83 decks350 decks
8%synergy
Scrubland
24%inclusion83 decks350 decks
8%synergy
Mana Confluence
23%inclusion81 decks350 decks
9%synergy
Floodfarm Verge
23%inclusion79 decks350 decks
11%synergy
Valgavoth's Lair
22%inclusion77 decks350 decks
20%synergy
Prairie Stream
22%inclusion77 decks350 decks
-19%synergy
Gloomlake Verge
21%inclusion74 decks350 decks
10%synergy
Sunken Hollow
21%inclusion73 decks350 decks
-19%synergy
Bloodstained Mire
21%inclusion72 decks350 decks
10%synergy
Tainted Isle
20%inclusion69 decks350 decks
13%synergy
Azorius Chancery
20%inclusion69 decks350 decks
7%synergy
Tainted Field
19%inclusion65 decks350 decks
12%synergy
Sink into Stupor
19%inclusion65 decks350 decks
5%synergy
Dimir Aqueduct
18%inclusion64 decks350 decks
6%synergy
Misty Rainforest
18%inclusion63 decks350 decks
7%synergy
Orzhov Basilica
18%inclusion62 decks350 decks
3%synergy
Temple of Silence
17%inclusion61 decks350 decks
-1%synergy
Deserted Beach
17%inclusion61 decks350 decks
-3%synergy
Windswept Heath
17%inclusion60 decks350 decks
8%synergy
Verdant Catacombs
17%inclusion60 decks350 decks
8%synergy
Temple of Enlightenment
17%inclusion60 decks350 decks
2%synergy
Scalding Tarn
17%inclusion59 decks350 decks
6%synergy
Temple of Deceit
16%inclusion57 decks350 decks
-0%synergy
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