The Master of Keys (Commander) - Expensive Core

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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Battles
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Ripples of Undeath
76%inclusion28 decks37 decks
73%synergy
Entity Tracker
73%inclusion27 decks37 decks
67%synergy
Animate Dead
73%inclusion27 decks37 decks
63%synergy
Grasp of Fate
68%inclusion25 decks37 decks
61%synergy
Necromancy
65%inclusion24 decks37 decks
60%synergy
Inquisitive Glimmer
68%inclusion25 decks37 decks
60%synergy
Hall of Heliod's Generosity
73%inclusion27 decks37 decks
60%synergy
Mesa Enchantress
65%inclusion24 decks37 decks
56%synergy
Gravebreaker Lamia
54%inclusion20 decks37 decks
53%synergy
Overlord of the Balemurk
51%inclusion19 decks37 decks
49%synergy
Top Cards
Demon of Fate's Design
54%inclusion20 decks37 decks
49%synergy
Overlord of the Floodpits
51%inclusion19 decks37 decks
48%synergy
Mystic Remora
51%inclusion19 decks37 decks
30%synergy
Dress Down
51%inclusion19 decks37 decks
49%synergy
Mirrormade
49%inclusion18 decks37 decks
39%synergy
Starfield of Nyx
49%inclusion18 decks37 decks
45%synergy
Ghostly Prison
49%inclusion18 decks37 decks
27%synergy
Fear of Impostors
49%inclusion18 decks37 decks
47%synergy
Secret Arcade // Dusty Parlor
49%inclusion18 decks37 decks
44%synergy
Sevinne's Reclamation
46%inclusion17 decks37 decks
37%synergy
Game Changers
Necropotence
8.1%inclusion3 decks37 decks
1%synergy
Notion Thief
8.1%inclusion3 decks37 decks
1%synergy
Thassa's Oracle
8.1%inclusion3 decks37 decks
-2%synergy
Narset, Parter of Veils
5.4%inclusion2 decks37 decks
1%synergy
Enlightened Tutor
5.4%inclusion2 decks37 decks
-15%synergy
Demonic Tutor
5.4%inclusion2 decks37 decks
-16%synergy
Cyclonic Rift
5.4%inclusion2 decks37 decks
-19%synergy
Teferi's Protection
5.4%inclusion2 decks37 decks
-11%synergy
Creatures
Starfield Mystic
46%inclusion17 decks37 decks
39%synergy
Scrabbling Skullcrab
46%inclusion17 decks37 decks
45%synergy
Zur, Eternal Schemer
46%inclusion17 decks37 decks
43%synergy
Fear of Sleep Paralysis
43%inclusion16 decks37 decks
38%synergy
Ondu Spiritdancer
41%inclusion15 decks37 decks
34%synergy
Victor, Valgavoth's Seneschal
38%inclusion14 decks37 decks
36%synergy
Heliod, the Radiant Dawn
38%inclusion14 decks37 decks
34%synergy
Doomwake Giant
38%inclusion14 decks37 decks
32%synergy
Grim Guardian
35%inclusion13 decks37 decks
33%synergy
Enduring Curiosity
32%inclusion12 decks37 decks
25%synergy
Ghostly Dancers
24%inclusion9 decks37 decks
22%synergy
Summon: Yojimbo
23%inclusion5 decks22 decks
22%synergy
Lotho, Corrupt Shirriff
22%inclusion8 decks37 decks
5%synergy
Zur the Enchanter
22%inclusion8 decks37 decks
16%synergy
Silent Hallcreeper
22%inclusion8 decks37 decks
17%synergy
Archon of Sun's Grace
19%inclusion7 decks37 decks
14%synergy
Sage of Mysteries
19%inclusion7 decks37 decks
19%synergy
Overlord of the Mistmoors
19%inclusion7 decks37 decks
17%synergy
Balemurk Leech
19%inclusion7 decks37 decks
18%synergy
Moon-Blessed Cleric
19%inclusion7 decks37 decks
14%synergy
Witch Enchanter
19%inclusion7 decks37 decks
12%synergy
Abdel Adrian, Gorion's Ward
14%inclusion5 decks37 decks
12%synergy
Soaring Lightbringer
14%inclusion5 decks37 decks
9%synergy
Skullsnap Nuisance
14%inclusion5 decks37 decks
13%synergy
Sun Titan
14%inclusion5 decks37 decks
5%synergy
Aminatou, Veil Piercer
14%inclusion5 decks37 decks
12%synergy
Alseid of Life's Bounty
14%inclusion5 decks37 decks
12%synergy
Astelli Reclaimer
13%inclusion2 decks16 decks
12%synergy
Esper Sentinel
11%inclusion4 decks37 decks
-17%synergy
Boggart Trawler
11%inclusion4 decks37 decks
8%synergy
Grand Abolisher
11%inclusion4 decks37 decks
-4%synergy
Valgavoth, Terror Eater
11%inclusion4 decks37 decks
7%synergy
Ledger Shredder
11%inclusion4 decks37 decks
2%synergy
Spirited Companion
11%inclusion4 decks37 decks
9%synergy
Mindwrack Harpy
11%inclusion4 decks37 decks
11%synergy
Summon: Anima
9.1%inclusion2 decks22 decks
9%synergy
Laboratory Maniac
8.1%inclusion3 decks37 decks
5%synergy
Loran of the Third Path
8.1%inclusion3 decks37 decks
5%synergy
Ancient Cellarspawn
8.1%inclusion3 decks37 decks
5%synergy
Valley Floodcaller
8.1%inclusion3 decks37 decks
4%synergy
Archetype of Imagination
8.1%inclusion3 decks37 decks
3%synergy
Auramancer
8.1%inclusion3 decks37 decks
5%synergy
Lurrus of the Dream-Den
8.1%inclusion3 decks37 decks
7%synergy
Doom Whisperer
8.1%inclusion3 decks37 decks
7%synergy
Hedron Crab
8.1%inclusion3 decks37 decks
8%synergy
Nashi, Searcher in the Dark
8.1%inclusion3 decks37 decks
8%synergy
Glasspool Mimic
8.1%inclusion3 decks37 decks
6%synergy
Faith Healer
8.1%inclusion3 decks37 decks
8%synergy
High Fae Trickster
5.7%inclusion2 decks35 decks
1%synergy
Phenax, God of Deception
5.4%inclusion2 decks37 decks
5%synergy
Instants
Swords to Plowshares
41%inclusion15 decks37 decks
-28%synergy
An Offer You Can't Refuse
38%inclusion14 decks37 decks
11%synergy
Entomb
32%inclusion12 decks37 decks
26%synergy
Swan Song
30%inclusion11 decks37 decks
10%synergy
Counterspell
30%inclusion11 decks37 decks
-12%synergy
Path to Exile
27%inclusion10 decks37 decks
-15%synergy
Fell the Profane
22%inclusion8 decks37 decks
13%synergy
Arcane Denial
19%inclusion7 decks37 decks
-1%synergy
Dark Ritual
19%inclusion7 decks37 decks
0%synergy
Dovin's Veto
16%inclusion6 decks37 decks
-9%synergy
Sink into Stupor
16%inclusion6 decks37 decks
4%synergy
Void Rend
16%inclusion6 decks37 decks
-18%synergy
Frantic Search
14%inclusion5 decks37 decks
-4%synergy
Inkshield
14%inclusion5 decks37 decks
4%synergy
Mana Drain
14%inclusion5 decks37 decks
-4%synergy
Thought Scour
11%inclusion4 decks37 decks
10%synergy
Dawn's Truce
11%inclusion4 decks37 decks
6%synergy
Thirst for Meaning
11%inclusion4 decks37 decks
9%synergy
Anguished Unmaking
11%inclusion4 decks37 decks
-14%synergy
Fact or Fiction
8.1%inclusion3 decks37 decks
4%synergy
Silence
8.1%inclusion3 decks37 decks
-2%synergy
Generous Gift
8.1%inclusion3 decks37 decks
-7%synergy
Brainstorm
8.1%inclusion3 decks37 decks
-9%synergy
Slip Out the Back
8.1%inclusion3 decks37 decks
7%synergy
Otherworldly Gaze
8.1%inclusion3 decks37 decks
6%synergy
Consult the Star Charts
6.3%inclusion1 decks16 decks
5%synergy
Mindbreak Trap
5.4%inclusion2 decks37 decks
-2%synergy
Angel's Grace
5.4%inclusion2 decks37 decks
3%synergy
Force of Negation
5.4%inclusion2 decks37 decks
-7%synergy
Simulacrum
5.4%inclusion2 decks37 decks
5%synergy
Negate
5.4%inclusion2 decks37 decks
-11%synergy
Into the Flood Maw
5.4%inclusion2 decks37 decks
2%synergy
Survive the Night
5.4%inclusion2 decks37 decks
5%synergy
Flusterstorm
5.4%inclusion2 decks37 decks
-3%synergy
Sejiri Shelter
5.4%inclusion2 decks37 decks
4%synergy
Sorceries
Redress Fate
41%inclusion15 decks37 decks
35%synergy
Reanimate
32%inclusion12 decks37 decks
16%synergy
Windfall
30%inclusion11 decks37 decks
16%synergy
Dance of the Manse
27%inclusion10 decks37 decks
23%synergy
Toxic Deluge
24%inclusion9 decks37 decks
5%synergy
Damn
19%inclusion7 decks37 decks
-2%synergy
Replenish
16%inclusion6 decks37 decks
14%synergy
Space-Time Anomaly
13%inclusion2 decks16 decks
11%synergy
Supreme Verdict
11%inclusion4 decks37 decks
-4%synergy
Extinguish All Hope
11%inclusion4 decks37 decks
9%synergy
Resurgent Belief
8.1%inclusion3 decks37 decks
6%synergy
Idyllic Tutor
8.1%inclusion3 decks37 decks
4%synergy
Approach of the Second Sun
8.1%inclusion3 decks37 decks
4%synergy
Stock Up
6.5%inclusion2 decks31 decks
5%synergy
Identity Crisis
5.4%inclusion2 decks37 decks
5%synergy
Ghostform
5.4%inclusion2 decks37 decks
5%synergy
Austere Command
5.4%inclusion2 decks37 decks
-4%synergy
Lively Dirge
5.4%inclusion2 decks37 decks
4%synergy
Open the Vaults
5.4%inclusion2 decks37 decks
4%synergy
Cut Your Losses
5.4%inclusion2 decks37 decks
5%synergy
Glimpse the Unthinkable
5.4%inclusion2 decks37 decks
5%synergy
Breach the Multiverse
5.4%inclusion2 decks37 decks
3%synergy
Ponder
5.4%inclusion2 decks37 decks
-4%synergy
Unmarked Grave
5.4%inclusion2 decks37 decks
4%synergy
Haunting Misery
5.4%inclusion2 decks37 decks
5%synergy
Brilliant Restoration
5.4%inclusion2 decks37 decks
3%synergy
Traumatize
5.4%inclusion2 decks37 decks
5%synergy
Utility Artifacts
Mesmeric Orb
30%inclusion11 decks37 decks
29%synergy
Lightning Greaves
16%inclusion6 decks37 decks
-6%synergy
Cloud Key
14%inclusion5 decks37 decks
10%synergy
Whip of Erebos
8.1%inclusion3 decks37 decks
6%synergy
Swiftfoot Boots
8.1%inclusion3 decks37 decks
-16%synergy
The Book of Exalted Deeds
5.4%inclusion2 decks37 decks
5%synergy
Perpetual Timepiece
5.4%inclusion2 decks37 decks
5%synergy
Palantír of Orthanc
5.4%inclusion2 decks37 decks
4%synergy
Rishadan Pawnshop
5.4%inclusion2 decks37 decks
5%synergy
Book of Rass
5.4%inclusion2 decks37 decks
5%synergy
Altar of the Brood
5.4%inclusion2 decks37 decks
4%synergy
Cellar Door
5.4%inclusion2 decks37 decks
5%synergy
Crucible of Worlds
5.4%inclusion2 decks37 decks
4%synergy
Orazca Puzzle-Door
5.4%inclusion2 decks37 decks
5%synergy
Archaeomancer's Map
5.4%inclusion2 decks37 decks
0%synergy
The Book of Vile Darkness
5.4%inclusion2 decks37 decks
5%synergy
Enchantments
Seal of Cleansing
46%inclusion17 decks37 decks
44%synergy
Propaganda
46%inclusion17 decks37 decks
19%synergy
Cacophony Unleashed
46%inclusion17 decks37 decks
44%synergy
Cemetery Tampering
38%inclusion14 decks37 decks
37%synergy
Black Market Connections
38%inclusion14 decks37 decks
24%synergy
Sphere of Safety
35%inclusion13 decks37 decks
26%synergy
Amphibian Downpour
35%inclusion13 decks37 decks
31%synergy
Polluted Cistern // Dim Oubliette
35%inclusion13 decks37 decks
35%synergy
Hallowed Haunting
35%inclusion13 decks37 decks
33%synergy
Dance of the Dead
35%inclusion13 decks37 decks
33%synergy
Monologue Tax
32%inclusion12 decks37 decks
26%synergy
Estrid's Invocation
32%inclusion12 decks37 decks
28%synergy
Sheltered by Ghosts
32%inclusion12 decks37 decks
30%synergy
Teval's Judgment
31%inclusion8 decks26 decks
30%synergy
Stillness in Motion
31%inclusion8 decks26 decks
30%synergy
Darksteel Mutation
30%inclusion11 decks37 decks
23%synergy
The Meathook Massacre
30%inclusion11 decks37 decks
26%synergy
Sigil of the Empty Throne
30%inclusion11 decks37 decks
24%synergy
Out of the Tombs
30%inclusion11 decks37 decks
29%synergy
Blind Obedience
30%inclusion11 decks37 decks
17%synergy
Greater Auramancy
30%inclusion11 decks37 decks
25%synergy
Mirror Room // Fractured Realm
27%inclusion10 decks37 decks
25%synergy
Secrets of the Dead
24%inclusion9 decks37 decks
24%synergy
Imprisoned in the Moon
24%inclusion9 decks37 decks
18%synergy
Copy Enchantment
24%inclusion9 decks37 decks
20%synergy
Touch the Spirit Realm
19%inclusion7 decks37 decks
16%synergy
Shark Typhoon
19%inclusion7 decks37 decks
13%synergy
Central Elevator // Promising Stairs
19%inclusion7 decks37 decks
18%synergy
The Tale of Tamiyo
19%inclusion7 decks37 decks
18%synergy
Aura of Silence
19%inclusion7 decks37 decks
16%synergy
Phyrexian Arena
19%inclusion7 decks37 decks
5%synergy
Defiled Crypt // Cadaver Lab
19%inclusion7 decks37 decks
18%synergy
Leyline of Anticipation
16%inclusion6 decks37 decks
12%synergy
Nowhere to Run
16%inclusion6 decks37 decks
15%synergy
Restricted Office // Lecture Hall
16%inclusion6 decks37 decks
14%synergy
Seal of Removal
16%inclusion6 decks37 decks
16%synergy
Underwater Tunnel // Slimy Aquarium
14%inclusion5 decks37 decks
13%synergy
Funeral Room // Awakening Hall
14%inclusion5 decks37 decks
13%synergy
Cramped Vents // Access Maze
14%inclusion5 decks37 decks
11%synergy
Court of Ardenvale
14%inclusion5 decks37 decks
13%synergy
Trouble in Pairs
14%inclusion5 decks37 decks
8%synergy
Static Prison
14%inclusion5 decks37 decks
13%synergy
Oubliette
14%inclusion5 decks37 decks
12%synergy
Land Tax
14%inclusion5 decks37 decks
7%synergy
Court of Cunning
11%inclusion4 decks37 decks
10%synergy
Extravagant Replication
11%inclusion4 decks37 decks
6%synergy
Court of Vantress
11%inclusion4 decks37 decks
8%synergy
Bottomless Pool // Locker Room
11%inclusion4 decks37 decks
9%synergy
Painful Quandary
11%inclusion4 decks37 decks
8%synergy
Solitary Confinement
11%inclusion4 decks37 decks
9%synergy
Battles
Invasion of Theros
11%inclusion4 decks37 decks
9%synergy
Planeswalkers
Jace, Wielder of Mysteries
8.1%inclusion3 decks37 decks
6%synergy
Jace, the Perfected Mind
5.4%inclusion2 decks37 decks
5%synergy
Teferi, Time Raveler
5.4%inclusion2 decks37 decks
-3%synergy
Utility Lands
Bojuka Bog
43%inclusion16 decks37 decks
16%synergy
Otawara, Soaring City
43%inclusion16 decks37 decks
24%synergy
Takenuma, Abandoned Mire
30%inclusion11 decks37 decks
23%synergy
Adagia, Windswept Bastion
25%inclusion4 decks16 decks
22%synergy
Reliquary Tower
22%inclusion8 decks37 decks
-12%synergy
Urborg, Tomb of Yawgmoth
22%inclusion8 decks37 decks
8%synergy
Cephalid Coliseum
16%inclusion6 decks37 decks
13%synergy
Urza's Saga
11%inclusion4 decks37 decks
-1%synergy
Ghost Quarter
8.1%inclusion3 decks37 decks
7%synergy
Maze of Ith
8.1%inclusion3 decks37 decks
5%synergy
Halimar Depths
8.1%inclusion3 decks37 decks
3%synergy
War Room
5.4%inclusion2 decks37 decks
5%synergy
Drownyard Temple
5.4%inclusion2 decks37 decks
5%synergy
Restless Reef
5.4%inclusion2 decks37 decks
4%synergy
Mana Artifacts
Arcane Signet
73%inclusion27 decks37 decks
-15%synergy
Sol Ring
70%inclusion26 decks37 decks
-20%synergy
Talisman of Dominance
54%inclusion20 decks37 decks
5%synergy
Talisman of Hierarchy
49%inclusion18 decks37 decks
5%synergy
Talisman of Progress
46%inclusion17 decks37 decks
3%synergy
Fellwar Stone
27%inclusion10 decks37 decks
-7%synergy
Orzhov Signet
27%inclusion10 decks37 decks
-7%synergy
Azorius Signet
27%inclusion10 decks37 decks
-5%synergy
Dimir Signet
24%inclusion9 decks37 decks
-8%synergy
Lotus Petal
5.4%inclusion2 decks37 decks
-5%synergy
Thran Dynamo
5.4%inclusion2 decks37 decks
2%synergy
Lands
Plains
97%inclusion36 decks37 decks
6%synergy
Command Tower
97%inclusion36 decks37 decks
5%synergy
Island
95%inclusion35 decks37 decks
2%synergy
Swamp
89%inclusion33 decks37 decks
-2%synergy
Flooded Strand
86%inclusion32 decks37 decks
48%synergy
Polluted Delta
84%inclusion31 decks37 decks
46%synergy
Hallowed Fountain
84%inclusion31 decks37 decks
35%synergy
Watery Grave
81%inclusion30 decks37 decks
31%synergy
Marsh Flats
81%inclusion30 decks37 decks
45%synergy
Godless Shrine
78%inclusion29 decks37 decks
28%synergy
Raffine's Tower
70%inclusion26 decks37 decks
29%synergy
Shadowy Backstreet
70%inclusion26 decks37 decks
58%synergy
Morphic Pool
65%inclusion24 decks37 decks
30%synergy
Meticulous Archive
65%inclusion24 decks37 decks
51%synergy
Sea of Clouds
65%inclusion24 decks37 decks
29%synergy
Undercity Sewers
65%inclusion24 decks37 decks
51%synergy
Vault of Champions
59%inclusion22 decks37 decks
27%synergy
Exotic Orchard
49%inclusion18 decks37 decks
-10%synergy
Adarkar Wastes
49%inclusion18 decks37 decks
18%synergy
Caves of Koilos
46%inclusion17 decks37 decks
10%synergy
Underground River
43%inclusion16 decks37 decks
10%synergy
Drowned Catacomb
38%inclusion14 decks37 decks
2%synergy
Glacial Fortress
35%inclusion13 decks37 decks
-5%synergy
Shipwreck Marsh
35%inclusion13 decks37 decks
14%synergy
Valgavoth's Lair
35%inclusion13 decks37 decks
32%synergy
Isolated Chapel
32%inclusion12 decks37 decks
-6%synergy
Tundra
32%inclusion12 decks37 decks
16%synergy
Arcane Sanctum
32%inclusion12 decks37 decks
-22%synergy
Scrubland
32%inclusion12 decks37 decks
16%synergy
Gloomlake Verge
32%inclusion12 decks37 decks
21%synergy
Deserted Beach
32%inclusion12 decks37 decks
12%synergy
Underground Sea
30%inclusion11 decks37 decks
14%synergy
Floodfarm Verge
30%inclusion11 decks37 decks
19%synergy
Bleachbone Verge
26%inclusion8 decks31 decks
17%synergy
Misty Rainforest
24%inclusion9 decks37 decks
13%synergy
Shattered Sanctum
24%inclusion9 decks37 decks
8%synergy
Bloodstained Mire
24%inclusion9 decks37 decks
13%synergy
Fell the Profane
22%inclusion8 decks37 decks
13%synergy
Verdant Catacombs
22%inclusion8 decks37 decks
11%synergy
Dimir Aqueduct
19%inclusion7 decks37 decks
5%synergy
Scalding Tarn
19%inclusion7 decks37 decks
8%synergy
Azorius Chancery
19%inclusion7 decks37 decks
5%synergy
Witch Enchanter
19%inclusion7 decks37 decks
12%synergy
Windswept Heath
19%inclusion7 decks37 decks
9%synergy
Arid Mesa
19%inclusion7 decks37 decks
9%synergy
Fabled Passage
16%inclusion6 decks37 decks
9%synergy
Sink into Stupor
16%inclusion6 decks37 decks
4%synergy
Orzhov Basilica
16%inclusion6 decks37 decks
0%synergy
City of Brass
16%inclusion6 decks37 decks
1%synergy
Sunken Hollow
16%inclusion6 decks37 decks
-23%synergy
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