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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Enchantments
Battles
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Utility Lands
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Ripples of Undeath
75%inclusion27 decks36 decks
72%synergy
Entity Tracker
69%inclusion25 decks36 decks
63%synergy
Animate Dead
69%inclusion25 decks36 decks
60%synergy
Necromancy
64%inclusion23 decks36 decks
59%synergy
Hall of Heliod's Generosity
72%inclusion26 decks36 decks
59%synergy
Inquisitive Glimmer
67%inclusion24 decks36 decks
59%synergy
Grasp of Fate
61%inclusion22 decks36 decks
55%synergy
Mesa Enchantress
61%inclusion22 decks36 decks
52%synergy
Gravebreaker Lamia
50%inclusion18 decks36 decks
49%synergy
Overlord of the Balemurk
50%inclusion18 decks36 decks
48%synergy
Top Cards
Dress Down
50%inclusion18 decks36 decks
47%synergy
Overlord of the Floodpits
50%inclusion18 decks36 decks
46%synergy
Demon of Fate's Design
50%inclusion18 decks36 decks
44%synergy
Mystic Remora
47%inclusion17 decks36 decks
26%synergy
Zur, Eternal Schemer
47%inclusion17 decks36 decks
44%synergy
Fear of Impostors
47%inclusion17 decks36 decks
46%synergy
Ghostly Prison
47%inclusion17 decks36 decks
26%synergy
Propaganda
47%inclusion17 decks36 decks
21%synergy
Mirrormade
44%inclusion16 decks36 decks
35%synergy
Starfield of Nyx
44%inclusion16 decks36 decks
40%synergy
Game Changers
Notion Thief
8.3%inclusion3 decks36 decks
1%synergy
Thassa's Oracle
8.3%inclusion3 decks36 decks
-2%synergy
Teferi's Protection
5.6%inclusion2 decks36 decks
-11%synergy
Cyclonic Rift
5.6%inclusion2 decks36 decks
-19%synergy
Necropotence
5.6%inclusion2 decks36 decks
-1%synergy
Demonic Tutor
5.6%inclusion2 decks36 decks
-16%synergy
Narset, Parter of Veils
5.6%inclusion2 decks36 decks
2%synergy
Enlightened Tutor
5.6%inclusion2 decks36 decks
-15%synergy
Creatures
Starfield Mystic
44%inclusion16 decks36 decks
38%synergy
Scrabbling Skullcrab
42%inclusion15 decks36 decks
41%synergy
Fear of Sleep Paralysis
39%inclusion14 decks36 decks
33%synergy
Heliod, the Radiant Dawn
39%inclusion14 decks36 decks
35%synergy
Ondu Spiritdancer
36%inclusion13 decks36 decks
30%synergy
Doomwake Giant
36%inclusion13 decks36 decks
30%synergy
Victor, Valgavoth's Seneschal
33%inclusion12 decks36 decks
31%synergy
Grim Guardian
31%inclusion11 decks36 decks
28%synergy
Enduring Curiosity
31%inclusion11 decks36 decks
23%synergy
Summon: Yojimbo
27%inclusion6 decks22 decks
26%synergy
Lotho, Corrupt Shirriff
22%inclusion8 decks36 decks
5%synergy
Sage of Mysteries
19%inclusion7 decks36 decks
19%synergy
Moon-Blessed Cleric
19%inclusion7 decks36 decks
15%synergy
Zur the Enchanter
19%inclusion7 decks36 decks
14%synergy
Silent Hallcreeper
19%inclusion7 decks36 decks
15%synergy
Ghostly Dancers
19%inclusion7 decks36 decks
17%synergy
Witch Enchanter
17%inclusion6 decks36 decks
10%synergy
Archon of Sun's Grace
17%inclusion6 decks36 decks
12%synergy
Overlord of the Mistmoors
17%inclusion6 decks36 decks
14%synergy
Balemurk Leech
17%inclusion6 decks36 decks
16%synergy
Esper Sentinel
14%inclusion5 decks36 decks
-14%synergy
Sun Titan
14%inclusion5 decks36 decks
5%synergy
Abdel Adrian, Gorion's Ward
14%inclusion5 decks36 decks
12%synergy
Ledger Shredder
14%inclusion5 decks36 decks
5%synergy
Boggart Trawler
14%inclusion5 decks36 decks
11%synergy
Aminatou, Veil Piercer
14%inclusion5 decks36 decks
12%synergy
Alseid of Life's Bounty
14%inclusion5 decks36 decks
12%synergy
Astelli Reclaimer
13%inclusion2 decks15 decks
13%synergy
Skullsnap Nuisance
11%inclusion4 decks36 decks
11%synergy
Spirited Companion
11%inclusion4 decks36 decks
9%synergy
Grand Abolisher
11%inclusion4 decks36 decks
-3%synergy
Valgavoth, Terror Eater
11%inclusion4 decks36 decks
8%synergy
Soaring Lightbringer
11%inclusion4 decks36 decks
6%synergy
Nashi, Searcher in the Dark
11%inclusion4 decks36 decks
11%synergy
Summon: Primal Odin
9.1%inclusion2 decks22 decks
5%synergy
Summon: Bahamut
9.1%inclusion2 decks22 decks
8%synergy
Summon: Knights of Round
9.1%inclusion2 decks22 decks
6%synergy
Summon: Anima
9.1%inclusion2 decks22 decks
9%synergy
Doom Whisperer
8.3%inclusion3 decks36 decks
7%synergy
Archetype of Imagination
8.3%inclusion3 decks36 decks
4%synergy
Valley Floodcaller
8.3%inclusion3 decks36 decks
4%synergy
Hedron Crab
8.3%inclusion3 decks36 decks
8%synergy
Ancient Cellarspawn
8.3%inclusion3 decks36 decks
5%synergy
Auramancer
8.3%inclusion3 decks36 decks
5%synergy
Mindwrack Harpy
8.3%inclusion3 decks36 decks
8%synergy
Lurrus of the Dream-Den
8.3%inclusion3 decks36 decks
7%synergy
Laboratory Maniac
8.3%inclusion3 decks36 decks
5%synergy
Loran of the Third Path
8.3%inclusion3 decks36 decks
5%synergy
Umbral Collar Zealot
6.7%inclusion1 decks15 decks
6%synergy
High Fae Trickster
5.9%inclusion2 decks34 decks
1%synergy
Instants
Swords to Plowshares
42%inclusion15 decks36 decks
-27%synergy
An Offer You Can't Refuse
36%inclusion13 decks36 decks
10%synergy
Counterspell
33%inclusion12 decks36 decks
-8%synergy
Swan Song
31%inclusion11 decks36 decks
11%synergy
Path to Exile
31%inclusion11 decks36 decks
-11%synergy
Entomb
28%inclusion10 decks36 decks
21%synergy
Arcane Denial
25%inclusion9 decks36 decks
5%synergy
Dark Ritual
19%inclusion7 decks36 decks
0%synergy
Void Rend
19%inclusion7 decks36 decks
-14%synergy
Fell the Profane
19%inclusion7 decks36 decks
11%synergy
Dovin's Veto
17%inclusion6 decks36 decks
-8%synergy
Sink into Stupor
17%inclusion6 decks36 decks
4%synergy
Frantic Search
14%inclusion5 decks36 decks
-3%synergy
Mana Drain
14%inclusion5 decks36 decks
-4%synergy
Fact or Fiction
11%inclusion4 decks36 decks
7%synergy
Thirst for Meaning
11%inclusion4 decks36 decks
10%synergy
Inkshield
11%inclusion4 decks36 decks
2%synergy
Thought Scour
11%inclusion4 decks36 decks
10%synergy
Silence
8.3%inclusion3 decks36 decks
-2%synergy
Brainstorm
8.3%inclusion3 decks36 decks
-9%synergy
Anguished Unmaking
8.3%inclusion3 decks36 decks
-16%synergy
Otherworldly Gaze
8.3%inclusion3 decks36 decks
6%synergy
Generous Gift
8.3%inclusion3 decks36 decks
-7%synergy
Dawn's Truce
8.3%inclusion3 decks36 decks
4%synergy
Slip Out the Back
8.3%inclusion3 decks36 decks
7%synergy
Consult the Star Charts
6.7%inclusion1 decks15 decks
6%synergy
Ephemerate
5.6%inclusion2 decks36 decks
2%synergy
Simulacrum
5.6%inclusion2 decks36 decks
6%synergy
Negate
5.6%inclusion2 decks36 decks
-11%synergy
Flusterstorm
5.6%inclusion2 decks36 decks
-3%synergy
Into the Flood Maw
5.6%inclusion2 decks36 decks
2%synergy
Mindbreak Trap
5.6%inclusion2 decks36 decks
-1%synergy
Angel's Grace
5.6%inclusion2 decks36 decks
3%synergy
Force of Negation
5.6%inclusion2 decks36 decks
-6%synergy
Snap
5.6%inclusion2 decks36 decks
4%synergy
Sejiri Shelter
5.6%inclusion2 decks36 decks
4%synergy
Survive the Night
5.6%inclusion2 decks36 decks
6%synergy
Malakir Rebirth
5.6%inclusion2 decks36 decks
1%synergy
Sorceries
Sevinne's Reclamation
44%inclusion16 decks36 decks
36%synergy
Redress Fate
42%inclusion15 decks36 decks
35%synergy
Reanimate
33%inclusion12 decks36 decks
17%synergy
Windfall
31%inclusion11 decks36 decks
17%synergy
Toxic Deluge
28%inclusion10 decks36 decks
8%synergy
Dance of the Manse
22%inclusion8 decks36 decks
18%synergy
Damn
19%inclusion7 decks36 decks
-1%synergy
Replenish
14%inclusion5 decks36 decks
12%synergy
Space-Time Anomaly
13%inclusion2 decks15 decks
12%synergy
Supreme Verdict
11%inclusion4 decks36 decks
-4%synergy
Resurgent Belief
11%inclusion4 decks36 decks
9%synergy
Extinguish All Hope
11%inclusion4 decks36 decks
9%synergy
Approach of the Second Sun
8.3%inclusion3 decks36 decks
5%synergy
Breach the Multiverse
8.3%inclusion3 decks36 decks
6%synergy
Stock Up
6.7%inclusion2 decks30 decks
5%synergy
Lively Dirge
5.6%inclusion2 decks36 decks
4%synergy
Open the Vaults
5.6%inclusion2 decks36 decks
4%synergy
Cut Your Losses
5.6%inclusion2 decks36 decks
5%synergy
Idyllic Tutor
5.6%inclusion2 decks36 decks
1%synergy
Ghostform
5.6%inclusion2 decks36 decks
6%synergy
Brilliant Restoration
5.6%inclusion2 decks36 decks
3%synergy
Ponder
5.6%inclusion2 decks36 decks
-4%synergy
Incarnation Technique
5.6%inclusion2 decks36 decks
5%synergy
Identity Crisis
5.6%inclusion2 decks36 decks
6%synergy
Victimize
5.6%inclusion2 decks36 decks
-3%synergy
Unmarked Grave
5.6%inclusion2 decks36 decks
4%synergy
Haunting Misery
5.6%inclusion2 decks36 decks
6%synergy
Traumatize
5.6%inclusion2 decks36 decks
5%synergy
Utility Artifacts
Mesmeric Orb
28%inclusion10 decks36 decks
27%synergy
Cloud Key
17%inclusion6 decks36 decks
13%synergy
Lightning Greaves
11%inclusion4 decks36 decks
-11%synergy
Whip of Erebos
8.3%inclusion3 decks36 decks
6%synergy
Perpetual Timepiece
5.6%inclusion2 decks36 decks
5%synergy
Cellar Door
5.6%inclusion2 decks36 decks
6%synergy
Book of Rass
5.6%inclusion2 decks36 decks
6%synergy
Archaeomancer's Map
5.6%inclusion2 decks36 decks
1%synergy
The Book of Exalted Deeds
5.6%inclusion2 decks36 decks
5%synergy
Crucible of Worlds
5.6%inclusion2 decks36 decks
5%synergy
Palantír of Orthanc
5.6%inclusion2 decks36 decks
4%synergy
The Book of Vile Darkness
5.6%inclusion2 decks36 decks
5%synergy
Orazca Puzzle-Door
5.6%inclusion2 decks36 decks
6%synergy
Rishadan Pawnshop
5.6%inclusion2 decks36 decks
5%synergy
Altar of the Brood
5.6%inclusion2 decks36 decks
4%synergy
Enchantments
Cacophony Unleashed
42%inclusion15 decks36 decks
40%synergy
Secret Arcade // Dusty Parlor
42%inclusion15 decks36 decks
36%synergy
Cemetery Tampering
39%inclusion14 decks36 decks
38%synergy
Seal of Cleansing
39%inclusion14 decks36 decks
37%synergy
Dance of the Dead
39%inclusion14 decks36 decks
37%synergy
Black Market Connections
36%inclusion13 decks36 decks
22%synergy
Sphere of Safety
33%inclusion12 decks36 decks
24%synergy
Amphibian Downpour
33%inclusion12 decks36 decks
29%synergy
Blind Obedience
33%inclusion12 decks36 decks
21%synergy
Teval's Judgment
31%inclusion8 decks26 decks
30%synergy
Estrid's Invocation
31%inclusion11 decks36 decks
26%synergy
Polluted Cistern // Dim Oubliette
31%inclusion11 decks36 decks
30%synergy
Sheltered by Ghosts
31%inclusion11 decks36 decks
28%synergy
Hallowed Haunting
31%inclusion11 decks36 decks
28%synergy
Monologue Tax
28%inclusion10 decks36 decks
22%synergy
Darksteel Mutation
28%inclusion10 decks36 decks
21%synergy
The Meathook Massacre
28%inclusion10 decks36 decks
24%synergy
Out of the Tombs
28%inclusion10 decks36 decks
27%synergy
Greater Auramancy
28%inclusion10 decks36 decks
23%synergy
Stillness in Motion
27%inclusion7 decks26 decks
27%synergy
Mirror Room // Fractured Realm
25%inclusion9 decks36 decks
23%synergy
Sigil of the Empty Throne
25%inclusion9 decks36 decks
19%synergy
Secrets of the Dead
22%inclusion8 decks36 decks
22%synergy
Copy Enchantment
22%inclusion8 decks36 decks
18%synergy
Imprisoned in the Moon
22%inclusion8 decks36 decks
16%synergy
Shark Typhoon
19%inclusion7 decks36 decks
14%synergy
Aura of Silence
19%inclusion7 decks36 decks
16%synergy
Trouble in Pairs
17%inclusion6 decks36 decks
11%synergy
Touch the Spirit Realm
17%inclusion6 decks36 decks
14%synergy
Leyline of Anticipation
17%inclusion6 decks36 decks
12%synergy
Nowhere to Run
17%inclusion6 decks36 decks
15%synergy
Defiled Crypt // Cadaver Lab
17%inclusion6 decks36 decks
16%synergy
Central Elevator // Promising Stairs
17%inclusion6 decks36 decks
16%synergy
The Tale of Tamiyo
17%inclusion6 decks36 decks
16%synergy
Seal of Removal
14%inclusion5 decks36 decks
13%synergy
Restricted Office // Lecture Hall
14%inclusion5 decks36 decks
12%synergy
Static Prison
14%inclusion5 decks36 decks
13%synergy
Court of Ardenvale
14%inclusion5 decks36 decks
13%synergy
Land Tax
14%inclusion5 decks36 decks
8%synergy
Cramped Vents // Access Maze
11%inclusion4 decks36 decks
8%synergy
Court of Cunning
11%inclusion4 decks36 decks
10%synergy
All That Glitters
11%inclusion4 decks36 decks
2%synergy
Eaten by Piranhas
11%inclusion4 decks36 decks
10%synergy
Oubliette
11%inclusion4 decks36 decks
10%synergy
Bloodchief Ascension
11%inclusion4 decks36 decks
6%synergy
Search for Azcanta
11%inclusion4 decks36 decks
10%synergy
Funeral Room // Awakening Hall
11%inclusion4 decks36 decks
10%synergy
Underwater Tunnel // Slimy Aquarium
11%inclusion4 decks36 decks
11%synergy
Authority of the Consuls
11%inclusion4 decks36 decks
0%synergy
Court of Vantress
11%inclusion4 decks36 decks
8%synergy
Battles
Invasion of Theros
8.3%inclusion3 decks36 decks
6%synergy
Planeswalkers
Jace, Wielder of Mysteries
8.3%inclusion3 decks36 decks
6%synergy
Jace, the Perfected Mind
5.6%inclusion2 decks36 decks
5%synergy
Teferi, Time Raveler
5.6%inclusion2 decks36 decks
-3%synergy
Utility Lands
Otawara, Soaring City
47%inclusion17 decks36 decks
28%synergy
Bojuka Bog
44%inclusion16 decks36 decks
17%synergy
Takenuma, Abandoned Mire
36%inclusion13 decks36 decks
30%synergy
Reliquary Tower
22%inclusion8 decks36 decks
-11%synergy
Adagia, Windswept Bastion
20%inclusion3 decks15 decks
17%synergy
Urborg, Tomb of Yawgmoth
19%inclusion7 decks36 decks
6%synergy
Cephalid Coliseum
17%inclusion6 decks36 decks
13%synergy
Urza's Saga
11%inclusion4 decks36 decks
-1%synergy
Maze of Ith
8.3%inclusion3 decks36 decks
5%synergy
Ghost Quarter
8.3%inclusion3 decks36 decks
7%synergy
Halimar Depths
8.3%inclusion3 decks36 decks
3%synergy
Phyrexian Tower
5.6%inclusion2 decks36 decks
2%synergy
Drownyard Temple
5.6%inclusion2 decks36 decks
5%synergy
Homeward Path
5.6%inclusion2 decks36 decks
5%synergy
Mana Artifacts
Sol Ring
72%inclusion26 decks36 decks
-18%synergy
Arcane Signet
69%inclusion25 decks36 decks
-18%synergy
Talisman of Dominance
50%inclusion18 decks36 decks
1%synergy
Talisman of Hierarchy
44%inclusion16 decks36 decks
1%synergy
Talisman of Progress
42%inclusion15 decks36 decks
-1%synergy
Fellwar Stone
28%inclusion10 decks36 decks
-6%synergy
Orzhov Signet
22%inclusion8 decks36 decks
-13%synergy
Azorius Signet
22%inclusion8 decks36 decks
-11%synergy
Dimir Signet
19%inclusion7 decks36 decks
-14%synergy
Lotus Petal
5.6%inclusion2 decks36 decks
-5%synergy
Thran Dynamo
5.6%inclusion2 decks36 decks
2%synergy
Lands
Plains
97%inclusion35 decks36 decks
6%synergy
Command Tower
97%inclusion35 decks36 decks
5%synergy
Island
94%inclusion34 decks36 decks
2%synergy
Swamp
89%inclusion32 decks36 decks
-2%synergy
Polluted Delta
86%inclusion31 decks36 decks
49%synergy
Hallowed Fountain
86%inclusion31 decks36 decks
37%synergy
Flooded Strand
86%inclusion31 decks36 decks
48%synergy
Watery Grave
83%inclusion30 decks36 decks
34%synergy
Marsh Flats
83%inclusion30 decks36 decks
47%synergy
Godless Shrine
81%inclusion29 decks36 decks
31%synergy
Shadowy Backstreet
72%inclusion26 decks36 decks
60%synergy
Undercity Sewers
69%inclusion25 decks36 decks
55%synergy
Meticulous Archive
69%inclusion25 decks36 decks
56%synergy
Raffine's Tower
69%inclusion25 decks36 decks
28%synergy
Morphic Pool
67%inclusion24 decks36 decks
32%synergy
Sea of Clouds
64%inclusion23 decks36 decks
28%synergy
Vault of Champions
61%inclusion22 decks36 decks
28%synergy
Exotic Orchard
47%inclusion17 decks36 decks
-11%synergy
Adarkar Wastes
47%inclusion17 decks36 decks
17%synergy
Caves of Koilos
44%inclusion16 decks36 decks
9%synergy
Underground River
42%inclusion15 decks36 decks
10%synergy
Drowned Catacomb
39%inclusion14 decks36 decks
4%synergy
Glacial Fortress
36%inclusion13 decks36 decks
-3%synergy
Shipwreck Marsh
36%inclusion13 decks36 decks
15%synergy
Tundra
33%inclusion12 decks36 decks
17%synergy
Isolated Chapel
33%inclusion12 decks36 decks
-5%synergy
Scrubland
33%inclusion12 decks36 decks
17%synergy
Valgavoth's Lair
31%inclusion11 decks36 decks
28%synergy
Arcane Sanctum
31%inclusion11 decks36 decks
-24%synergy
Underground Sea
31%inclusion11 decks36 decks
15%synergy
Gloomlake Verge
31%inclusion11 decks36 decks
20%synergy
Deserted Beach
31%inclusion11 decks36 decks
10%synergy
Misty Rainforest
28%inclusion10 decks36 decks
16%synergy
Floodfarm Verge
28%inclusion10 decks36 decks
17%synergy
Bloodstained Mire
28%inclusion10 decks36 decks
17%synergy
Bleachbone Verge
27%inclusion8 decks30 decks
18%synergy
Verdant Catacombs
25%inclusion9 decks36 decks
15%synergy
Shattered Sanctum
22%inclusion8 decks36 decks
6%synergy
Arid Mesa
22%inclusion8 decks36 decks
12%synergy
Windswept Heath
22%inclusion8 decks36 decks
12%synergy
Scalding Tarn
22%inclusion8 decks36 decks
11%synergy
Sunken Hollow
19%inclusion7 decks36 decks
-20%synergy
Fell the Profane
19%inclusion7 decks36 decks
11%synergy
Witch Enchanter
17%inclusion6 decks36 decks
10%synergy
Azorius Chancery
17%inclusion6 decks36 decks
2%synergy
Dimir Aqueduct
17%inclusion6 decks36 decks
2%synergy
Sink into Stupor
17%inclusion6 decks36 decks
4%synergy
City of Brass
17%inclusion6 decks36 decks
1%synergy
Orzhov Basilica
14%inclusion5 decks36 decks
-2%synergy
Mana Confluence
14%inclusion5 decks36 decks
0%synergy
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