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
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Utility Lands
Mana Artifacts
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Noggle the Mind
17%inclusion1 decks6 decks
16%synergy
High Synergy Cards
Ripples of Undeath
73%inclusion29 decks40 decks
70%synergy
Hall of Heliod's Generosity
80%inclusion32 decks40 decks
67%synergy
Entity Tracker
70%inclusion28 decks40 decks
64%synergy
Inquisitive Glimmer
70%inclusion28 decks40 decks
63%synergy
Grasp of Fate
65%inclusion26 decks40 decks
59%synergy
Animate Dead
68%inclusion27 decks40 decks
58%synergy
Mesa Enchantress
65%inclusion26 decks40 decks
56%synergy
Necromancy
57%inclusion23 decks40 decks
53%synergy
Demon of Fate's Design
57%inclusion23 decks40 decks
52%synergy
Gravebreaker Lamia
53%inclusion21 decks40 decks
52%synergy
Top Cards
Starfield Mystic
53%inclusion21 decks40 decks
46%synergy
Starfield of Nyx
53%inclusion21 decks40 decks
48%synergy
Dress Down
53%inclusion21 decks40 decks
50%synergy
Mystic Remora
53%inclusion21 decks40 decks
31%synergy
Fear of Sleep Paralysis
48%inclusion19 decks40 decks
42%synergy
Seal of Cleansing
48%inclusion19 decks40 decks
46%synergy
Swords to Plowshares
48%inclusion19 decks40 decks
-21%synergy
Overlord of the Floodpits
48%inclusion19 decks40 decks
44%synergy
Mirrormade
48%inclusion19 decks40 decks
38%synergy
Secret Arcade // Dusty Parlor
48%inclusion19 decks40 decks
43%synergy
Game Changers
Necropotence
7.5%inclusion3 decks40 decks
1%synergy
Narset, Parter of Veils
7.5%inclusion3 decks40 decks
4%synergy
Notion Thief
7.5%inclusion3 decks40 decks
1%synergy
Demonic Tutor
5.0%inclusion2 decks40 decks
-16%synergy
Cyclonic Rift
5.0%inclusion2 decks40 decks
-19%synergy
Force of Will
5.0%inclusion2 decks40 decks
-8%synergy
Teferi's Protection
5.0%inclusion2 decks40 decks
-12%synergy
Thassa's Oracle
5.0%inclusion2 decks40 decks
-4%synergy
Enlightened Tutor
5.0%inclusion2 decks40 decks
-15%synergy
Creatures
Overlord of the Balemurk
45%inclusion18 decks40 decks
43%synergy
Fear of Impostors
45%inclusion18 decks40 decks
44%synergy
Zur, Eternal Schemer
43%inclusion17 decks40 decks
39%synergy
Doomwake Giant
43%inclusion17 decks40 decks
37%synergy
Ondu Spiritdancer
40%inclusion16 decks40 decks
34%synergy
Scrabbling Skullcrab
40%inclusion16 decks40 decks
39%synergy
Victor, Valgavoth's Seneschal
33%inclusion13 decks40 decks
31%synergy
Grim Guardian
33%inclusion13 decks40 decks
30%synergy
Enduring Curiosity
33%inclusion13 decks40 decks
25%synergy
Heliod, the Radiant Dawn
33%inclusion13 decks40 decks
29%synergy
Summon: Yojimbo
23%inclusion6 decks26 decks
22%synergy
Silent Hallcreeper
23%inclusion9 decks40 decks
18%synergy
Witch Enchanter
20%inclusion8 decks40 decks
13%synergy
Lotho, Corrupt Shirriff
20%inclusion8 decks40 decks
3%synergy
Sage of Mysteries
20%inclusion8 decks40 decks
20%synergy
Zur the Enchanter
20%inclusion8 decks40 decks
15%synergy
Archon of Sun's Grace
20%inclusion8 decks40 decks
15%synergy
Soaring Lightbringer
20%inclusion8 decks40 decks
15%synergy
Moon-Blessed Cleric
18%inclusion7 decks40 decks
13%synergy
Ghostly Dancers
18%inclusion7 decks40 decks
15%synergy
Overlord of the Mistmoors
18%inclusion7 decks40 decks
15%synergy
Aminatou, Veil Piercer
15%inclusion6 decks40 decks
14%synergy
Balemurk Leech
15%inclusion6 decks40 decks
14%synergy
Spirited Companion
13%inclusion5 decks40 decks
11%synergy
Grand Abolisher
13%inclusion5 decks40 decks
-2%synergy
Esper Sentinel
13%inclusion5 decks40 decks
-15%synergy
Sun Titan
13%inclusion5 decks40 decks
4%synergy
Abdel Adrian, Gorion's Ward
13%inclusion5 decks40 decks
11%synergy
Archetype of Imagination
13%inclusion5 decks40 decks
8%synergy
Alseid of Life's Bounty
13%inclusion5 decks40 decks
11%synergy
Astelli Reclaimer
11%inclusion2 decks18 decks
11%synergy
Nashi, Searcher in the Dark
10%inclusion4 decks40 decks
10%synergy
Boggart Trawler
10%inclusion4 decks40 decks
7%synergy
Athreos, Shroud-Veiled
10%inclusion4 decks40 decks
6%synergy
Valgavoth, Terror Eater
10%inclusion4 decks40 decks
7%synergy
Ledger Shredder
10%inclusion4 decks40 decks
1%synergy
Mindwrack Harpy
10%inclusion4 decks40 decks
10%synergy
Skullsnap Nuisance
10%inclusion4 decks40 decks
10%synergy
Ancient Cellarspawn
10%inclusion4 decks40 decks
7%synergy
Auramancer
10%inclusion4 decks40 decks
7%synergy
Summon: Primal Odin
7.7%inclusion2 decks26 decks
3%synergy
Summon: Bahamut
7.7%inclusion2 decks26 decks
6%synergy
Summon: Valefor
7.7%inclusion2 decks26 decks
7%synergy
Summon: Anima
7.7%inclusion2 decks26 decks
7%synergy
Summon: Knights of Round
7.7%inclusion2 decks26 decks
5%synergy
Doom Whisperer
7.5%inclusion3 decks40 decks
6%synergy
Valley Floodcaller
7.5%inclusion3 decks40 decks
3%synergy
Hedron Crab
7.5%inclusion3 decks40 decks
7%synergy
Loran of the Third Path
7.5%inclusion3 decks40 decks
5%synergy
Eidolon of Astral Winds
5.3%inclusion2 decks38 decks
5%synergy
Instants
An Offer You Can't Refuse
35%inclusion14 decks40 decks
8%synergy
Counterspell
30%inclusion12 decks40 decks
-12%synergy
Path to Exile
30%inclusion12 decks40 decks
-12%synergy
Entomb
30%inclusion12 decks40 decks
23%synergy
Swan Song
28%inclusion11 decks40 decks
8%synergy
Arcane Denial
28%inclusion11 decks40 decks
7%synergy
Dark Ritual
20%inclusion8 decks40 decks
1%synergy
Fell the Profane
20%inclusion8 decks40 decks
11%synergy
Sink into Stupor
18%inclusion7 decks40 decks
5%synergy
Dovin's Veto
18%inclusion7 decks40 decks
-8%synergy
Void Rend
18%inclusion7 decks40 decks
-17%synergy
Frantic Search
15%inclusion6 decks40 decks
-3%synergy
Inkshield
15%inclusion6 decks40 decks
6%synergy
Thirst for Meaning
15%inclusion6 decks40 decks
14%synergy
Thought Scour
13%inclusion5 decks40 decks
11%synergy
Mana Drain
13%inclusion5 decks40 decks
-5%synergy
Brainstorm
10%inclusion4 decks40 decks
-7%synergy
Otherworldly Gaze
10%inclusion4 decks40 decks
8%synergy
Slip Out the Back
7.5%inclusion3 decks40 decks
7%synergy
Silence
7.5%inclusion3 decks40 decks
-3%synergy
Generous Gift
7.5%inclusion3 decks40 decks
-7%synergy
Dawn's Truce
7.5%inclusion3 decks40 decks
3%synergy
Fact or Fiction
7.5%inclusion3 decks40 decks
4%synergy
Anguished Unmaking
7.5%inclusion3 decks40 decks
-18%synergy
Sejiri Shelter
7.5%inclusion3 decks40 decks
6%synergy
Consult the Star Charts
5.6%inclusion1 decks18 decks
5%synergy
Angel's Grace
5.0%inclusion2 decks40 decks
2%synergy
Force of Negation
5.0%inclusion2 decks40 decks
-7%synergy
Simulacrum
5.0%inclusion2 decks40 decks
5%synergy
Negate
5.0%inclusion2 decks40 decks
-11%synergy
Mindbreak Trap
5.0%inclusion2 decks40 decks
-2%synergy
Consider
5.0%inclusion2 decks40 decks
3%synergy
Tainted Indulgence
5.0%inclusion2 decks40 decks
4%synergy
Flusterstorm
5.0%inclusion2 decks40 decks
-3%synergy
Curate
5.0%inclusion2 decks40 decks
5%synergy
Into the Flood Maw
5.0%inclusion2 decks40 decks
1%synergy
Survive the Night
5.0%inclusion2 decks40 decks
5%synergy
Sorceries
Sevinne's Reclamation
45%inclusion18 decks40 decks
36%synergy
Redress Fate
45%inclusion18 decks40 decks
39%synergy
Reanimate
33%inclusion13 decks40 decks
16%synergy
Windfall
30%inclusion12 decks40 decks
16%synergy
Dance of the Manse
25%inclusion10 decks40 decks
22%synergy
Toxic Deluge
23%inclusion9 decks40 decks
3%synergy
Damn
20%inclusion8 decks40 decks
0%synergy
Replenish
18%inclusion7 decks40 decks
16%synergy
Space-Time Anomaly
17%inclusion3 decks18 decks
15%synergy
Idyllic Tutor
13%inclusion5 decks40 decks
8%synergy
Extinguish All Hope
13%inclusion5 decks40 decks
11%synergy
Supreme Verdict
10%inclusion4 decks40 decks
-5%synergy
Resurgent Belief
10%inclusion4 decks40 decks
8%synergy
Glimpse the Unthinkable
10%inclusion4 decks40 decks
10%synergy
Cut Your Losses
7.5%inclusion3 decks40 decks
7%synergy
Traumatize
7.5%inclusion3 decks40 decks
7%synergy
Approach of the Second Sun
7.5%inclusion3 decks40 decks
4%synergy
Ponder
7.5%inclusion3 decks40 decks
-2%synergy
Open the Vaults
7.5%inclusion3 decks40 decks
6%synergy
Brilliant Restoration
7.5%inclusion3 decks40 decks
6%synergy
Stock Up
5.9%inclusion2 decks34 decks
4%synergy
Unmarked Grave
5.0%inclusion2 decks40 decks
4%synergy
Diabolic Tutor
5.0%inclusion2 decks40 decks
0%synergy
Time Wipe
5.0%inclusion2 decks40 decks
-2%synergy
Haunting Misery
5.0%inclusion2 decks40 decks
5%synergy
Grim Tutor
5.0%inclusion2 decks40 decks
1%synergy
Breach the Multiverse
5.0%inclusion2 decks40 decks
3%synergy
Identity Crisis
5.0%inclusion2 decks40 decks
5%synergy
Careful Study
5.0%inclusion2 decks40 decks
3%synergy
Diresight
5.0%inclusion2 decks40 decks
4%synergy
Lively Dirge
5.0%inclusion2 decks40 decks
4%synergy
Dread Return
5.0%inclusion2 decks40 decks
2%synergy
Read the Bones
5.0%inclusion2 decks40 decks
1%synergy
Ghostform
5.0%inclusion2 decks40 decks
5%synergy
Utility Artifacts
Mesmeric Orb
28%inclusion11 decks40 decks
26%synergy
Lightning Greaves
15%inclusion6 decks40 decks
-7%synergy
Cloud Key
15%inclusion6 decks40 decks
12%synergy
Whip of Erebos
7.5%inclusion3 decks40 decks
5%synergy
Swiftfoot Boots
7.5%inclusion3 decks40 decks
-17%synergy
The Book of Exalted Deeds
5.0%inclusion2 decks40 decks
4%synergy
Crucible of Worlds
5.0%inclusion2 decks40 decks
4%synergy
Cellar Door
5.0%inclusion2 decks40 decks
5%synergy
Book of Rass
5.0%inclusion2 decks40 decks
5%synergy
Archaeomancer's Map
5.0%inclusion2 decks40 decks
0%synergy
Palantír of Orthanc
5.0%inclusion2 decks40 decks
4%synergy
The Book of Vile Darkness
5.0%inclusion2 decks40 decks
5%synergy
Perpetual Timepiece
5.0%inclusion2 decks40 decks
5%synergy
Orazca Puzzle-Door
5.0%inclusion2 decks40 decks
5%synergy
Rishadan Pawnshop
5.0%inclusion2 decks40 decks
5%synergy
Altar of the Brood
5.0%inclusion2 decks40 decks
4%synergy
Enchantments
Cacophony Unleashed
45%inclusion18 decks40 decks
43%synergy
Ghostly Prison
45%inclusion18 decks40 decks
23%synergy
Propaganda
45%inclusion18 decks40 decks
18%synergy
Black Market Connections
38%inclusion15 decks40 decks
23%synergy
Cemetery Tampering
38%inclusion15 decks40 decks
37%synergy
Hallowed Haunting
38%inclusion15 decks40 decks
35%synergy
Sigil of the Empty Throne
35%inclusion14 decks40 decks
29%synergy
Sphere of Safety
35%inclusion14 decks40 decks
26%synergy
Estrid's Invocation
33%inclusion13 decks40 decks
28%synergy
Monologue Tax
33%inclusion13 decks40 decks
26%synergy
Blind Obedience
33%inclusion13 decks40 decks
20%synergy
Amphibian Downpour
33%inclusion13 decks40 decks
28%synergy
Darksteel Mutation
30%inclusion12 decks40 decks
24%synergy
Dance of the Dead
30%inclusion12 decks40 decks
28%synergy
Polluted Cistern // Dim Oubliette
30%inclusion12 decks40 decks
29%synergy
Greater Auramancy
30%inclusion12 decks40 decks
26%synergy
The Meathook Massacre
28%inclusion11 decks40 decks
24%synergy
Sheltered by Ghosts
28%inclusion11 decks40 decks
25%synergy
Imprisoned in the Moon
25%inclusion10 decks40 decks
18%synergy
Teval's Judgment
25%inclusion7 decks28 decks
24%synergy
Copy Enchantment
25%inclusion10 decks40 decks
20%synergy
Out of the Tombs
25%inclusion10 decks40 decks
25%synergy
Secrets of the Dead
23%inclusion9 decks40 decks
22%synergy
Mirror Room // Fractured Realm
23%inclusion9 decks40 decks
20%synergy
Shark Typhoon
23%inclusion9 decks40 decks
17%synergy
Stillness in Motion
21%inclusion6 decks28 decks
21%synergy
Aura of Silence
20%inclusion8 decks40 decks
17%synergy
Touch the Spirit Realm
18%inclusion7 decks40 decks
15%synergy
The Tale of Tamiyo
18%inclusion7 decks40 decks
17%synergy
Seal of Removal
18%inclusion7 decks40 decks
17%synergy
Trouble in Pairs
15%inclusion6 decks40 decks
10%synergy
Defiled Crypt // Cadaver Lab
15%inclusion6 decks40 decks
14%synergy
Central Elevator // Promising Stairs
15%inclusion6 decks40 decks
14%synergy
Static Prison
15%inclusion6 decks40 decks
15%synergy
Restricted Office // Lecture Hall
15%inclusion6 decks40 decks
13%synergy
Phyrexian Arena
15%inclusion6 decks40 decks
1%synergy
Leyline of Anticipation
13%inclusion5 decks40 decks
8%synergy
Cramped Vents // Access Maze
13%inclusion5 decks40 decks
10%synergy
Extravagant Replication
13%inclusion5 decks40 decks
7%synergy
Oubliette
13%inclusion5 decks40 decks
11%synergy
Solitary Confinement
13%inclusion5 decks40 decks
10%synergy
Nowhere to Run
13%inclusion5 decks40 decks
11%synergy
Court of Cunning
10%inclusion4 decks40 decks
9%synergy
Underwater Tunnel // Slimy Aquarium
10%inclusion4 decks40 decks
10%synergy
Authority of the Consuls
10%inclusion4 decks40 decks
-2%synergy
Timely Ward
10%inclusion4 decks40 decks
5%synergy
All That Glitters
10%inclusion4 decks40 decks
1%synergy
Court of Ardenvale
10%inclusion4 decks40 decks
9%synergy
Copy Land
10%inclusion4 decks40 decks
9%synergy
Bloodchief Ascension
10%inclusion4 decks40 decks
5%synergy
Battles
Invasion of Theros
10%inclusion4 decks40 decks
8%synergy
Planeswalkers
Teferi, Time Raveler
7.5%inclusion3 decks40 decks
-1%synergy
Jace, Wielder of Mysteries
7.5%inclusion3 decks40 decks
6%synergy
Jace, the Perfected Mind
5.0%inclusion2 decks40 decks
5%synergy
Utility Lands
Otawara, Soaring City
43%inclusion17 decks40 decks
23%synergy
Bojuka Bog
43%inclusion17 decks40 decks
15%synergy
Takenuma, Abandoned Mire
30%inclusion12 decks40 decks
24%synergy
Adagia, Windswept Bastion
22%inclusion4 decks18 decks
20%synergy
Urborg, Tomb of Yawgmoth
18%inclusion7 decks40 decks
4%synergy
Reliquary Tower
18%inclusion7 decks40 decks
-16%synergy
Cephalid Coliseum
15%inclusion6 decks40 decks
11%synergy
Halimar Depths
10%inclusion4 decks40 decks
5%synergy
Urza's Saga
10%inclusion4 decks40 decks
-2%synergy
Maze of Ith
7.5%inclusion3 decks40 decks
5%synergy
Ghost Quarter
7.5%inclusion3 decks40 decks
7%synergy
Castle Locthwain
5.0%inclusion2 decks40 decks
4%synergy
Drownyard Temple
5.0%inclusion2 decks40 decks
5%synergy
Restless Reef
5.0%inclusion2 decks40 decks
4%synergy
Rogue's Passage
5.0%inclusion2 decks40 decks
-4%synergy
Phyrexian Tower
5.0%inclusion2 decks40 decks
1%synergy
War Room
5.0%inclusion2 decks40 decks
5%synergy
Mana Artifacts
Sol Ring
78%inclusion31 decks40 decks
-12%synergy
Arcane Signet
73%inclusion29 decks40 decks
-15%synergy
Talisman of Dominance
48%inclusion19 decks40 decks
-2%synergy
Talisman of Hierarchy
43%inclusion17 decks40 decks
-1%synergy
Talisman of Progress
40%inclusion16 decks40 decks
-3%synergy
Orzhov Signet
25%inclusion10 decks40 decks
-8%synergy
Azorius Signet
25%inclusion10 decks40 decks
-6%synergy
Fellwar Stone
25%inclusion10 decks40 decks
-9%synergy
Dimir Signet
20%inclusion8 decks40 decks
-12%synergy
Thran Dynamo
5.0%inclusion2 decks40 decks
1%synergy
Commander's Sphere
5.0%inclusion2 decks40 decks
-14%synergy
Lotus Petal
5.0%inclusion2 decks40 decks
-6%synergy
Mind Stone
5.0%inclusion2 decks40 decks
-8%synergy
Lands
Command Tower
98%inclusion39 decks40 decks
5%synergy
Plains
98%inclusion39 decks40 decks
6%synergy
Island
95%inclusion38 decks40 decks
2%synergy
Swamp
90%inclusion36 decks40 decks
-1%synergy
Hallowed Fountain
85%inclusion34 decks40 decks
35%synergy
Flooded Strand
85%inclusion34 decks40 decks
47%synergy
Polluted Delta
83%inclusion33 decks40 decks
45%synergy
Watery Grave
83%inclusion33 decks40 decks
32%synergy
Marsh Flats
80%inclusion32 decks40 decks
44%synergy
Godless Shrine
80%inclusion32 decks40 decks
29%synergy
Shadowy Backstreet
70%inclusion28 decks40 decks
57%synergy
Raffine's Tower
70%inclusion28 decks40 decks
29%synergy
Undercity Sewers
68%inclusion27 decks40 decks
53%synergy
Sea of Clouds
68%inclusion27 decks40 decks
32%synergy
Morphic Pool
68%inclusion27 decks40 decks
33%synergy
Meticulous Archive
65%inclusion26 decks40 decks
51%synergy
Vault of Champions
63%inclusion25 decks40 decks
30%synergy
Adarkar Wastes
53%inclusion21 decks40 decks
21%synergy
Caves of Koilos
48%inclusion19 decks40 decks
12%synergy
Underground River
45%inclusion18 decks40 decks
12%synergy
Exotic Orchard
43%inclusion17 decks40 decks
-16%synergy
Drowned Catacomb
40%inclusion16 decks40 decks
3%synergy
Glacial Fortress
38%inclusion15 decks40 decks
-4%synergy
Shipwreck Marsh
38%inclusion15 decks40 decks
17%synergy
Isolated Chapel
35%inclusion14 decks40 decks
-5%synergy
Deserted Beach
35%inclusion14 decks40 decks
14%synergy
Gloomlake Verge
33%inclusion13 decks40 decks
21%synergy
Arcane Sanctum
33%inclusion13 decks40 decks
-22%synergy
Tundra
30%inclusion12 decks40 decks
14%synergy
Floodfarm Verge
30%inclusion12 decks40 decks
19%synergy
Valgavoth's Lair
30%inclusion12 decks40 decks
27%synergy
Scrubland
30%inclusion12 decks40 decks
14%synergy
Underground Sea
28%inclusion11 decks40 decks
12%synergy
Bleachbone Verge
26%inclusion9 decks34 decks
18%synergy
Misty Rainforest
25%inclusion10 decks40 decks
14%synergy
Verdant Catacombs
25%inclusion10 decks40 decks
15%synergy
Bloodstained Mire
25%inclusion10 decks40 decks
14%synergy
Shattered Sanctum
23%inclusion9 decks40 decks
6%synergy
Scalding Tarn
23%inclusion9 decks40 decks
11%synergy
Witch Enchanter
20%inclusion8 decks40 decks
13%synergy
Sunken Hollow
20%inclusion8 decks40 decks
-20%synergy
Fell the Profane
20%inclusion8 decks40 decks
11%synergy
Arid Mesa
20%inclusion8 decks40 decks
10%synergy
Windswept Heath
20%inclusion8 decks40 decks
10%synergy
Azorius Chancery
18%inclusion7 decks40 decks
3%synergy
Dimir Aqueduct
18%inclusion7 decks40 decks
4%synergy
Prairie Stream
18%inclusion7 decks40 decks
-23%synergy
Sink into Stupor
18%inclusion7 decks40 decks
5%synergy
Orzhov Basilica
15%inclusion6 decks40 decks
-1%synergy
City of Brass
15%inclusion6 decks40 decks
0%synergy
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