The Master of Keys (Commander) - Expensive Core

The Master of Keys
Rank #307
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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 Lands
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Noggle the Mind
17%inclusion1 decks6 decks
16%synergy
High Synergy Cards
Ripples of Undeath
74%inclusion29 decks39 decks
72%synergy
Hall of Heliod's Generosity
79%inclusion31 decks39 decks
66%synergy
Entity Tracker
72%inclusion28 decks39 decks
65%synergy
Inquisitive Glimmer
72%inclusion28 decks39 decks
64%synergy
Grasp of Fate
67%inclusion26 decks39 decks
61%synergy
Animate Dead
69%inclusion27 decks39 decks
60%synergy
Gravebreaker Lamia
56%inclusion22 decks39 decks
55%synergy
Mesa Enchantress
64%inclusion25 decks39 decks
55%synergy
Necromancy
59%inclusion23 decks39 decks
54%synergy
Dress Down
54%inclusion21 decks39 decks
51%synergy
Top Cards
Demon of Fate's Design
56%inclusion22 decks39 decks
51%synergy
Mystic Remora
54%inclusion21 decks39 decks
33%synergy
Starfield of Nyx
54%inclusion21 decks39 decks
50%synergy
Starfield Mystic
51%inclusion20 decks39 decks
45%synergy
Overlord of the Floodpits
49%inclusion19 decks39 decks
45%synergy
Seal of Cleansing
49%inclusion19 decks39 decks
47%synergy
Ghostly Prison
49%inclusion19 decks39 decks
27%synergy
Overlord of the Balemurk
46%inclusion18 decks39 decks
44%synergy
Secret Arcade // Dusty Parlor
46%inclusion18 decks39 decks
41%synergy
Fear of Impostors
46%inclusion18 decks39 decks
45%synergy
Game Changers
Notion Thief
7.7%inclusion3 decks39 decks
1%synergy
Necropotence
7.7%inclusion3 decks39 decks
1%synergy
Narset, Parter of Veils
7.7%inclusion3 decks39 decks
4%synergy
Teferi's Protection
5.1%inclusion2 decks39 decks
-12%synergy
Thassa's Oracle
5.1%inclusion2 decks39 decks
-4%synergy
Demonic Tutor
5.1%inclusion2 decks39 decks
-16%synergy
Force of Will
5.1%inclusion2 decks39 decks
-8%synergy
Enlightened Tutor
5.1%inclusion2 decks39 decks
-15%synergy
Cyclonic Rift
5.1%inclusion2 decks39 decks
-19%synergy
Creatures
Fear of Sleep Paralysis
46%inclusion18 decks39 decks
41%synergy
Zur, Eternal Schemer
44%inclusion17 decks39 decks
40%synergy
Scrabbling Skullcrab
44%inclusion17 decks39 decks
43%synergy
Doomwake Giant
41%inclusion16 decks39 decks
35%synergy
Ondu Spiritdancer
38%inclusion15 decks39 decks
32%synergy
Victor, Valgavoth's Seneschal
33%inclusion13 decks39 decks
31%synergy
Heliod, the Radiant Dawn
33%inclusion13 decks39 decks
30%synergy
Enduring Curiosity
33%inclusion13 decks39 decks
25%synergy
Grim Guardian
33%inclusion13 decks39 decks
31%synergy
Silent Hallcreeper
23%inclusion9 decks39 decks
19%synergy
Summon: Yojimbo
23%inclusion6 decks26 decks
22%synergy
Lotho, Corrupt Shirriff
21%inclusion8 decks39 decks
4%synergy
Witch Enchanter
21%inclusion8 decks39 decks
14%synergy
Zur the Enchanter
21%inclusion8 decks39 decks
15%synergy
Archon of Sun's Grace
18%inclusion7 decks39 decks
13%synergy
Sage of Mysteries
18%inclusion7 decks39 decks
18%synergy
Soaring Lightbringer
18%inclusion7 decks39 decks
13%synergy
Overlord of the Mistmoors
18%inclusion7 decks39 decks
16%synergy
Ghostly Dancers
18%inclusion7 decks39 decks
15%synergy
Moon-Blessed Cleric
15%inclusion6 decks39 decks
11%synergy
Balemurk Leech
15%inclusion6 decks39 decks
15%synergy
Alseid of Life's Bounty
13%inclusion5 decks39 decks
11%synergy
Esper Sentinel
13%inclusion5 decks39 decks
-15%synergy
Spirited Companion
13%inclusion5 decks39 decks
11%synergy
Sun Titan
13%inclusion5 decks39 decks
4%synergy
Aminatou, Veil Piercer
13%inclusion5 decks39 decks
11%synergy
Grand Abolisher
13%inclusion5 decks39 decks
-2%synergy
Abdel Adrian, Gorion's Ward
13%inclusion5 decks39 decks
11%synergy
Astelli Reclaimer
11%inclusion2 decks18 decks
11%synergy
Nashi, Searcher in the Dark
10%inclusion4 decks39 decks
10%synergy
Mindwrack Harpy
10%inclusion4 decks39 decks
10%synergy
Archetype of Imagination
10%inclusion4 decks39 decks
6%synergy
Boggart Trawler
10%inclusion4 decks39 decks
7%synergy
Skullsnap Nuisance
10%inclusion4 decks39 decks
10%synergy
Valgavoth, Terror Eater
10%inclusion4 decks39 decks
7%synergy
Ledger Shredder
10%inclusion4 decks39 decks
1%synergy
Valley Floodcaller
7.7%inclusion3 decks39 decks
4%synergy
Doom Whisperer
7.7%inclusion3 decks39 decks
6%synergy
Ancient Cellarspawn
7.7%inclusion3 decks39 decks
5%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
Athreos, Shroud-Veiled
7.7%inclusion3 decks39 decks
3%synergy
Summon: Knights of Round
7.7%inclusion2 decks26 decks
5%synergy
Hedron Crab
7.7%inclusion3 decks39 decks
7%synergy
Loran of the Third Path
7.7%inclusion3 decks39 decks
5%synergy
Auramancer
7.7%inclusion3 decks39 decks
5%synergy
Summon: Anima
7.7%inclusion2 decks26 decks
7%synergy
Eidolon of Astral Winds
5.4%inclusion2 decks37 decks
5%synergy
Spectral Gateguards
5.1%inclusion2 decks39 decks
5%synergy
Instants
Swords to Plowshares
46%inclusion18 decks39 decks
-22%synergy
An Offer You Can't Refuse
36%inclusion14 decks39 decks
9%synergy
Entomb
31%inclusion12 decks39 decks
24%synergy
Path to Exile
31%inclusion12 decks39 decks
-11%synergy
Counterspell
31%inclusion12 decks39 decks
-11%synergy
Swan Song
28%inclusion11 decks39 decks
9%synergy
Arcane Denial
26%inclusion10 decks39 decks
5%synergy
Fell the Profane
21%inclusion8 decks39 decks
12%synergy
Dark Ritual
21%inclusion8 decks39 decks
1%synergy
Void Rend
18%inclusion7 decks39 decks
-16%synergy
Sink into Stupor
18%inclusion7 decks39 decks
5%synergy
Dovin's Veto
18%inclusion7 decks39 decks
-7%synergy
Frantic Search
15%inclusion6 decks39 decks
-2%synergy
Thought Scour
13%inclusion5 decks39 decks
12%synergy
Inkshield
13%inclusion5 decks39 decks
3%synergy
Thirst for Meaning
13%inclusion5 decks39 decks
11%synergy
Mana Drain
13%inclusion5 decks39 decks
-5%synergy
Dawn's Truce
10%inclusion4 decks39 decks
6%synergy
Brainstorm
7.7%inclusion3 decks39 decks
-9%synergy
Anguished Unmaking
7.7%inclusion3 decks39 decks
-17%synergy
Fact or Fiction
7.7%inclusion3 decks39 decks
4%synergy
Sejiri Shelter
7.7%inclusion3 decks39 decks
6%synergy
Slip Out the Back
7.7%inclusion3 decks39 decks
7%synergy
Silence
7.7%inclusion3 decks39 decks
-3%synergy
Otherworldly Gaze
7.7%inclusion3 decks39 decks
5%synergy
Generous Gift
7.7%inclusion3 decks39 decks
-7%synergy
Consult the Star Charts
5.6%inclusion1 decks18 decks
5%synergy
Simulacrum
5.1%inclusion2 decks39 decks
5%synergy
Into the Flood Maw
5.1%inclusion2 decks39 decks
1%synergy
Force of Negation
5.1%inclusion2 decks39 decks
-7%synergy
Negate
5.1%inclusion2 decks39 decks
-11%synergy
Mindbreak Trap
5.1%inclusion2 decks39 decks
-2%synergy
Curate
5.1%inclusion2 decks39 decks
5%synergy
Survive the Night
5.1%inclusion2 decks39 decks
5%synergy
Consider
5.1%inclusion2 decks39 decks
3%synergy
Angel's Grace
5.1%inclusion2 decks39 decks
2%synergy
Tainted Indulgence
5.1%inclusion2 decks39 decks
4%synergy
Flusterstorm
5.1%inclusion2 decks39 decks
-3%synergy
Sorceries
Redress Fate
44%inclusion17 decks39 decks
38%synergy
Sevinne's Reclamation
44%inclusion17 decks39 decks
35%synergy
Windfall
31%inclusion12 decks39 decks
17%synergy
Reanimate
31%inclusion12 decks39 decks
15%synergy
Dance of the Manse
26%inclusion10 decks39 decks
22%synergy
Toxic Deluge
23%inclusion9 decks39 decks
3%synergy
Damn
21%inclusion8 decks39 decks
0%synergy
Replenish
18%inclusion7 decks39 decks
16%synergy
Space-Time Anomaly
17%inclusion3 decks18 decks
15%synergy
Resurgent Belief
10%inclusion4 decks39 decks
8%synergy
Supreme Verdict
10%inclusion4 decks39 decks
-5%synergy
Glimpse the Unthinkable
10%inclusion4 decks39 decks
10%synergy
Idyllic Tutor
10%inclusion4 decks39 decks
6%synergy
Extinguish All Hope
10%inclusion4 decks39 decks
9%synergy
Open the Vaults
7.7%inclusion3 decks39 decks
6%synergy
Cut Your Losses
7.7%inclusion3 decks39 decks
7%synergy
Traumatize
7.7%inclusion3 decks39 decks
7%synergy
Approach of the Second Sun
7.7%inclusion3 decks39 decks
4%synergy
Brilliant Restoration
7.7%inclusion3 decks39 decks
6%synergy
Stock Up
6.1%inclusion2 decks33 decks
4%synergy
Ponder
5.1%inclusion2 decks39 decks
-4%synergy
Careful Study
5.1%inclusion2 decks39 decks
3%synergy
Dread Return
5.1%inclusion2 decks39 decks
2%synergy
Diresight
5.1%inclusion2 decks39 decks
5%synergy
Lively Dirge
5.1%inclusion2 decks39 decks
4%synergy
Unmarked Grave
5.1%inclusion2 decks39 decks
4%synergy
Ghostform
5.1%inclusion2 decks39 decks
5%synergy
Haunting Misery
5.1%inclusion2 decks39 decks
5%synergy
Grim Tutor
5.1%inclusion2 decks39 decks
1%synergy
Breach the Multiverse
5.1%inclusion2 decks39 decks
3%synergy
Identity Crisis
5.1%inclusion2 decks39 decks
5%synergy
Diabolic Tutor
5.1%inclusion2 decks39 decks
0%synergy
Utility Artifacts
Mesmeric Orb
28%inclusion11 decks39 decks
27%synergy
Cloud Key
15%inclusion6 decks39 decks
12%synergy
Lightning Greaves
15%inclusion6 decks39 decks
-7%synergy
Whip of Erebos
7.7%inclusion3 decks39 decks
5%synergy
Swiftfoot Boots
7.7%inclusion3 decks39 decks
-16%synergy
Rishadan Pawnshop
5.1%inclusion2 decks39 decks
5%synergy
Cellar Door
5.1%inclusion2 decks39 decks
5%synergy
Perpetual Timepiece
5.1%inclusion2 decks39 decks
5%synergy
Crucible of Worlds
5.1%inclusion2 decks39 decks
4%synergy
Orazca Puzzle-Door
5.1%inclusion2 decks39 decks
5%synergy
Palantír of Orthanc
5.1%inclusion2 decks39 decks
4%synergy
Book of Rass
5.1%inclusion2 decks39 decks
5%synergy
The Book of Exalted Deeds
5.1%inclusion2 decks39 decks
4%synergy
Altar of the Brood
5.1%inclusion2 decks39 decks
4%synergy
Archaeomancer's Map
5.1%inclusion2 decks39 decks
0%synergy
The Book of Vile Darkness
5.1%inclusion2 decks39 decks
5%synergy
Enchantments
Cacophony Unleashed
46%inclusion18 decks39 decks
44%synergy
Mirrormade
46%inclusion18 decks39 decks
36%synergy
Propaganda
46%inclusion18 decks39 decks
19%synergy
Cemetery Tampering
38%inclusion15 decks39 decks
38%synergy
Black Market Connections
38%inclusion15 decks39 decks
24%synergy
Hallowed Haunting
36%inclusion14 decks39 decks
34%synergy
Sigil of the Empty Throne
33%inclusion13 decks39 decks
27%synergy
Amphibian Downpour
33%inclusion13 decks39 decks
29%synergy
Blind Obedience
33%inclusion13 decks39 decks
21%synergy
Sphere of Safety
33%inclusion13 decks39 decks
24%synergy
Estrid's Invocation
33%inclusion13 decks39 decks
29%synergy
Darksteel Mutation
31%inclusion12 decks39 decks
25%synergy
Greater Auramancy
31%inclusion12 decks39 decks
26%synergy
Monologue Tax
31%inclusion12 decks39 decks
25%synergy
Polluted Cistern // Dim Oubliette
31%inclusion12 decks39 decks
30%synergy
Dance of the Dead
31%inclusion12 decks39 decks
29%synergy
Sheltered by Ghosts
28%inclusion11 decks39 decks
26%synergy
The Meathook Massacre
28%inclusion11 decks39 decks
25%synergy
Imprisoned in the Moon
26%inclusion10 decks39 decks
19%synergy
Out of the Tombs
26%inclusion10 decks39 decks
25%synergy
Copy Enchantment
26%inclusion10 decks39 decks
21%synergy
Teval's Judgment
25%inclusion7 decks28 decks
24%synergy
Secrets of the Dead
23%inclusion9 decks39 decks
23%synergy
Mirror Room // Fractured Realm
23%inclusion9 decks39 decks
21%synergy
Stillness in Motion
21%inclusion6 decks28 decks
21%synergy
Aura of Silence
21%inclusion8 decks39 decks
17%synergy
Shark Typhoon
21%inclusion8 decks39 decks
15%synergy
Seal of Removal
18%inclusion7 decks39 decks
17%synergy
Touch the Spirit Realm
18%inclusion7 decks39 decks
15%synergy
The Tale of Tamiyo
18%inclusion7 decks39 decks
18%synergy
Static Prison
15%inclusion6 decks39 decks
15%synergy
Trouble in Pairs
15%inclusion6 decks39 decks
10%synergy
Defiled Crypt // Cadaver Lab
15%inclusion6 decks39 decks
15%synergy
Central Elevator // Promising Stairs
15%inclusion6 decks39 decks
15%synergy
Restricted Office // Lecture Hall
15%inclusion6 decks39 decks
13%synergy
Phyrexian Arena
15%inclusion6 decks39 decks
1%synergy
Leyline of Anticipation
13%inclusion5 decks39 decks
8%synergy
Oubliette
13%inclusion5 decks39 decks
11%synergy
Nowhere to Run
13%inclusion5 decks39 decks
12%synergy
Solitary Confinement
13%inclusion5 decks39 decks
11%synergy
Cramped Vents // Access Maze
10%inclusion4 decks39 decks
8%synergy
Extravagant Replication
10%inclusion4 decks39 decks
5%synergy
All That Glitters
10%inclusion4 decks39 decks
1%synergy
Court of Ardenvale
10%inclusion4 decks39 decks
10%synergy
Painful Quandary
10%inclusion4 decks39 decks
8%synergy
Copy Land
10%inclusion4 decks39 decks
10%synergy
Land Tax
10%inclusion4 decks39 decks
4%synergy
Bloodchief Ascension
10%inclusion4 decks39 decks
5%synergy
Court of Cunning
10%inclusion4 decks39 decks
9%synergy
Underwater Tunnel // Slimy Aquarium
10%inclusion4 decks39 decks
10%synergy
Battles
Invasion of Theros
10%inclusion4 decks39 decks
8%synergy
Planeswalkers
Jace, Wielder of Mysteries
7.7%inclusion3 decks39 decks
6%synergy
Teferi, Time Raveler
7.7%inclusion3 decks39 decks
-1%synergy
Jace, the Perfected Mind
5.1%inclusion2 decks39 decks
5%synergy
Utility Lands
Otawara, Soaring City
44%inclusion17 decks39 decks
24%synergy
Bojuka Bog
41%inclusion16 decks39 decks
14%synergy
Takenuma, Abandoned Mire
31%inclusion12 decks39 decks
24%synergy
Adagia, Windswept Bastion
22%inclusion4 decks18 decks
20%synergy
Reliquary Tower
18%inclusion7 decks39 decks
-16%synergy
Urborg, Tomb of Yawgmoth
18%inclusion7 decks39 decks
5%synergy
Cephalid Coliseum
15%inclusion6 decks39 decks
12%synergy
Urza's Saga
10%inclusion4 decks39 decks
-2%synergy
Maze of Ith
7.7%inclusion3 decks39 decks
5%synergy
Halimar Depths
7.7%inclusion3 decks39 decks
3%synergy
Ghost Quarter
7.7%inclusion3 decks39 decks
7%synergy
Rogue's Passage
5.1%inclusion2 decks39 decks
-4%synergy
Phyrexian Tower
5.1%inclusion2 decks39 decks
1%synergy
War Room
5.1%inclusion2 decks39 decks
5%synergy
Castle Locthwain
5.1%inclusion2 decks39 decks
4%synergy
Restless Reef
5.1%inclusion2 decks39 decks
4%synergy
Drownyard Temple
5.1%inclusion2 decks39 decks
5%synergy
Mana Artifacts
Sol Ring
77%inclusion30 decks39 decks
-13%synergy
Arcane Signet
72%inclusion28 decks39 decks
-16%synergy
Talisman of Dominance
49%inclusion19 decks39 decks
-1%synergy
Talisman of Hierarchy
44%inclusion17 decks39 decks
0%synergy
Talisman of Progress
41%inclusion16 decks39 decks
-2%synergy
Fellwar Stone
26%inclusion10 decks39 decks
-8%synergy
Azorius Signet
26%inclusion10 decks39 decks
-6%synergy
Orzhov Signet
26%inclusion10 decks39 decks
-8%synergy
Dimir Signet
23%inclusion9 decks39 decks
-9%synergy
Lotus Petal
5.1%inclusion2 decks39 decks
-6%synergy
Thran Dynamo
5.1%inclusion2 decks39 decks
1%synergy
Lands
Plains
97%inclusion38 decks39 decks
6%synergy
Command Tower
97%inclusion38 decks39 decks
5%synergy
Island
95%inclusion37 decks39 decks
2%synergy
Swamp
90%inclusion35 decks39 decks
-2%synergy
Hallowed Fountain
85%inclusion33 decks39 decks
35%synergy
Flooded Strand
85%inclusion33 decks39 decks
47%synergy
Polluted Delta
82%inclusion32 decks39 decks
44%synergy
Watery Grave
82%inclusion32 decks39 decks
32%synergy
Marsh Flats
79%inclusion31 decks39 decks
43%synergy
Godless Shrine
79%inclusion31 decks39 decks
29%synergy
Raffine's Tower
69%inclusion27 decks39 decks
28%synergy
Shadowy Backstreet
69%inclusion27 decks39 decks
57%synergy
Sea of Clouds
67%inclusion26 decks39 decks
31%synergy
Undercity Sewers
67%inclusion26 decks39 decks
52%synergy
Morphic Pool
67%inclusion26 decks39 decks
32%synergy
Meticulous Archive
64%inclusion25 decks39 decks
50%synergy
Vault of Champions
62%inclusion24 decks39 decks
29%synergy
Adarkar Wastes
51%inclusion20 decks39 decks
20%synergy
Caves of Koilos
49%inclusion19 decks39 decks
13%synergy
Exotic Orchard
44%inclusion17 decks39 decks
-15%synergy
Underground River
44%inclusion17 decks39 decks
10%synergy
Drowned Catacomb
41%inclusion16 decks39 decks
5%synergy
Glacial Fortress
38%inclusion15 decks39 decks
-2%synergy
Shipwreck Marsh
38%inclusion15 decks39 decks
18%synergy
Isolated Chapel
36%inclusion14 decks39 decks
-4%synergy
Deserted Beach
36%inclusion14 decks39 decks
15%synergy
Arcane Sanctum
33%inclusion13 decks39 decks
-21%synergy
Tundra
31%inclusion12 decks39 decks
15%synergy
Scrubland
31%inclusion12 decks39 decks
15%synergy
Valgavoth's Lair
31%inclusion12 decks39 decks
28%synergy
Gloomlake Verge
31%inclusion12 decks39 decks
20%synergy
Floodfarm Verge
28%inclusion11 decks39 decks
17%synergy
Underground Sea
28%inclusion11 decks39 decks
12%synergy
Bleachbone Verge
24%inclusion8 decks33 decks
16%synergy
Shattered Sanctum
23%inclusion9 decks39 decks
7%synergy
Verdant Catacombs
23%inclusion9 decks39 decks
13%synergy
Misty Rainforest
23%inclusion9 decks39 decks
12%synergy
Bloodstained Mire
23%inclusion9 decks39 decks
12%synergy
Scalding Tarn
21%inclusion8 decks39 decks
9%synergy
Sunken Hollow
21%inclusion8 decks39 decks
-19%synergy
Witch Enchanter
21%inclusion8 decks39 decks
14%synergy
Fell the Profane
21%inclusion8 decks39 decks
12%synergy
Sink into Stupor
18%inclusion7 decks39 decks
5%synergy
Azorius Chancery
18%inclusion7 decks39 decks
4%synergy
Windswept Heath
18%inclusion7 decks39 decks
8%synergy
Dimir Aqueduct
18%inclusion7 decks39 decks
4%synergy
Prairie Stream
18%inclusion7 decks39 decks
-23%synergy
Arid Mesa
18%inclusion7 decks39 decks
8%synergy
Orzhov Basilica
15%inclusion6 decks39 decks
0%synergy
City of Brass
15%inclusion6 decks39 decks
0%synergy
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