The Master of Keys (Commander) - Expensive Core

The Master of Keys
Rank #306
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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
Planeswalkers
Utility Lands
Mana Artifacts
Lands
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Noggle the Mind
33%inclusion1 decks3 decks
33%synergy
High Synergy Cards
Ripples of Undeath
74%inclusion28 decks38 decks
71%synergy
Entity Tracker
71%inclusion27 decks38 decks
65%synergy
Hall of Heliod's Generosity
76%inclusion29 decks38 decks
63%synergy
Grasp of Fate
68%inclusion26 decks38 decks
62%synergy
Animate Dead
71%inclusion27 decks38 decks
61%synergy
Inquisitive Glimmer
68%inclusion26 decks38 decks
61%synergy
Necromancy
61%inclusion23 decks38 decks
56%synergy
Gravebreaker Lamia
55%inclusion21 decks38 decks
54%synergy
Mesa Enchantress
63%inclusion24 decks38 decks
54%synergy
Dress Down
55%inclusion21 decks38 decks
53%synergy
Top Cards
Demon of Fate's Design
58%inclusion22 decks38 decks
52%synergy
Mystic Remora
53%inclusion20 decks38 decks
31%synergy
Starfield of Nyx
53%inclusion20 decks38 decks
49%synergy
Overlord of the Floodpits
50%inclusion19 decks38 decks
46%synergy
Seal of Cleansing
50%inclusion19 decks38 decks
49%synergy
Secret Arcade // Dusty Parlor
50%inclusion19 decks38 decks
45%synergy
Starfield Mystic
47%inclusion18 decks38 decks
41%synergy
Overlord of the Balemurk
47%inclusion18 decks38 decks
45%synergy
Fear of Sleep Paralysis
47%inclusion18 decks38 decks
42%synergy
Cacophony Unleashed
47%inclusion18 decks38 decks
46%synergy
Game Changers
Narset, Parter of Veils
7.9%inclusion3 decks38 decks
4%synergy
Necropotence
7.9%inclusion3 decks38 decks
1%synergy
Notion Thief
7.9%inclusion3 decks38 decks
1%synergy
Thassa's Oracle
5.3%inclusion2 decks38 decks
-4%synergy
Demonic Tutor
5.3%inclusion2 decks38 decks
-16%synergy
Force of Will
5.3%inclusion2 decks38 decks
-7%synergy
Enlightened Tutor
5.3%inclusion2 decks38 decks
-15%synergy
Teferi's Protection
5.3%inclusion2 decks38 decks
-12%synergy
Cyclonic Rift
5.3%inclusion2 decks38 decks
-19%synergy
Creatures
Fear of Impostors
45%inclusion17 decks38 decks
43%synergy
Scrabbling Skullcrab
42%inclusion16 decks38 decks
41%synergy
Zur, Eternal Schemer
42%inclusion16 decks38 decks
39%synergy
Ondu Spiritdancer
39%inclusion15 decks38 decks
33%synergy
Doomwake Giant
39%inclusion15 decks38 decks
34%synergy
Victor, Valgavoth's Seneschal
37%inclusion14 decks38 decks
35%synergy
Grim Guardian
37%inclusion14 decks38 decks
34%synergy
Heliod, the Radiant Dawn
34%inclusion13 decks38 decks
30%synergy
Enduring Curiosity
32%inclusion12 decks38 decks
24%synergy
Silent Hallcreeper
21%inclusion8 decks38 decks
17%synergy
Ghostly Dancers
21%inclusion8 decks38 decks
18%synergy
Lotho, Corrupt Shirriff
21%inclusion8 decks38 decks
4%synergy
Summon: Yojimbo
21%inclusion5 decks24 decks
20%synergy
Witch Enchanter
18%inclusion7 decks38 decks
12%synergy
Overlord of the Mistmoors
18%inclusion7 decks38 decks
16%synergy
Zur the Enchanter
18%inclusion7 decks38 decks
13%synergy
Archon of Sun's Grace
18%inclusion7 decks38 decks
14%synergy
Balemurk Leech
18%inclusion7 decks38 decks
18%synergy
Sage of Mysteries
16%inclusion6 decks38 decks
15%synergy
Soaring Lightbringer
16%inclusion6 decks38 decks
11%synergy
Moon-Blessed Cleric
16%inclusion6 decks38 decks
11%synergy
Spirited Companion
13%inclusion5 decks38 decks
11%synergy
Sun Titan
13%inclusion5 decks38 decks
5%synergy
Abdel Adrian, Gorion's Ward
13%inclusion5 decks38 decks
11%synergy
Alseid of Life's Bounty
13%inclusion5 decks38 decks
12%synergy
Skullsnap Nuisance
13%inclusion5 decks38 decks
13%synergy
Aminatou, Veil Piercer
13%inclusion5 decks38 decks
12%synergy
Astelli Reclaimer
12%inclusion2 decks17 decks
12%synergy
Valgavoth, Terror Eater
11%inclusion4 decks38 decks
7%synergy
Archetype of Imagination
11%inclusion4 decks38 decks
6%synergy
Grand Abolisher
11%inclusion4 decks38 decks
-4%synergy
Ledger Shredder
11%inclusion4 decks38 decks
2%synergy
Mindwrack Harpy
11%inclusion4 decks38 decks
10%synergy
Esper Sentinel
11%inclusion4 decks38 decks
-17%synergy
Boggart Trawler
11%inclusion4 decks38 decks
7%synergy
Summon: Valefor
8.3%inclusion2 decks24 decks
8%synergy
Summon: Anima
8.3%inclusion2 decks24 decks
8%synergy
Doom Whisperer
7.9%inclusion3 decks38 decks
6%synergy
Valley Floodcaller
7.9%inclusion3 decks38 decks
4%synergy
Loran of the Third Path
7.9%inclusion3 decks38 decks
5%synergy
Auramancer
7.9%inclusion3 decks38 decks
5%synergy
Glasspool Mimic
7.9%inclusion3 decks38 decks
5%synergy
Faith Healer
7.9%inclusion3 decks38 decks
8%synergy
Hedron Crab
7.9%inclusion3 decks38 decks
7%synergy
Nashi, Searcher in the Dark
7.9%inclusion3 decks38 decks
7%synergy
Ancient Cellarspawn
7.9%inclusion3 decks38 decks
5%synergy
Claim Jumper
5.3%inclusion2 decks38 decks
4%synergy
Malevolent Noble
5.3%inclusion2 decks38 decks
5%synergy
Stealer of Secrets
5.3%inclusion2 decks38 decks
5%synergy
Passwall Adept
5.3%inclusion2 decks38 decks
5%synergy
Instants
Swords to Plowshares
42%inclusion16 decks38 decks
-26%synergy
An Offer You Can't Refuse
37%inclusion14 decks38 decks
10%synergy
Entomb
32%inclusion12 decks38 decks
25%synergy
Swan Song
29%inclusion11 decks38 decks
9%synergy
Path to Exile
29%inclusion11 decks38 decks
-13%synergy
Counterspell
29%inclusion11 decks38 decks
-12%synergy
Fell the Profane
21%inclusion8 decks38 decks
12%synergy
Dark Ritual
21%inclusion8 decks38 decks
2%synergy
Arcane Denial
21%inclusion8 decks38 decks
1%synergy
Dovin's Veto
18%inclusion7 decks38 decks
-7%synergy
Void Rend
16%inclusion6 decks38 decks
-18%synergy
Frantic Search
16%inclusion6 decks38 decks
-2%synergy
Sink into Stupor
16%inclusion6 decks38 decks
3%synergy
Mana Drain
13%inclusion5 decks38 decks
-4%synergy
Thirst for Meaning
13%inclusion5 decks38 decks
12%synergy
Thought Scour
13%inclusion5 decks38 decks
12%synergy
Inkshield
13%inclusion5 decks38 decks
4%synergy
Dawn's Truce
11%inclusion4 decks38 decks
6%synergy
Anguished Unmaking
11%inclusion4 decks38 decks
-15%synergy
Silence
7.9%inclusion3 decks38 decks
-2%synergy
Sejiri Shelter
7.9%inclusion3 decks38 decks
6%synergy
Generous Gift
7.9%inclusion3 decks38 decks
-7%synergy
Brainstorm
7.9%inclusion3 decks38 decks
-9%synergy
Fact or Fiction
7.9%inclusion3 decks38 decks
4%synergy
Slip Out the Back
7.9%inclusion3 decks38 decks
7%synergy
Otherworldly Gaze
7.9%inclusion3 decks38 decks
6%synergy
Consult the Star Charts
5.9%inclusion1 decks17 decks
5%synergy
Flusterstorm
5.3%inclusion2 decks38 decks
-3%synergy
Force of Negation
5.3%inclusion2 decks38 decks
-7%synergy
Simulacrum
5.3%inclusion2 decks38 decks
5%synergy
Negate
5.3%inclusion2 decks38 decks
-11%synergy
Mindbreak Trap
5.3%inclusion2 decks38 decks
-2%synergy
Tainted Indulgence
5.3%inclusion2 decks38 decks
5%synergy
Curate
5.3%inclusion2 decks38 decks
5%synergy
Into the Flood Maw
5.3%inclusion2 decks38 decks
1%synergy
Consider
5.3%inclusion2 decks38 decks
3%synergy
Angel's Grace
5.3%inclusion2 decks38 decks
2%synergy
Survive the Night
5.3%inclusion2 decks38 decks
5%synergy
Sorceries
Sevinne's Reclamation
45%inclusion17 decks38 decks
36%synergy
Redress Fate
42%inclusion16 decks38 decks
36%synergy
Reanimate
32%inclusion12 decks38 decks
16%synergy
Windfall
29%inclusion11 decks38 decks
15%synergy
Dance of the Manse
26%inclusion10 decks38 decks
23%synergy
Toxic Deluge
24%inclusion9 decks38 decks
4%synergy
Replenish
18%inclusion7 decks38 decks
17%synergy
Damn
18%inclusion7 decks38 decks
-2%synergy
Space-Time Anomaly
18%inclusion3 decks17 decks
16%synergy
Idyllic Tutor
13%inclusion5 decks38 decks
9%synergy
Extinguish All Hope
11%inclusion4 decks38 decks
9%synergy
Supreme Verdict
11%inclusion4 decks38 decks
-4%synergy
Open the Vaults
7.9%inclusion3 decks38 decks
7%synergy
Cut Your Losses
7.9%inclusion3 decks38 decks
8%synergy
Resurgent Belief
7.9%inclusion3 decks38 decks
6%synergy
Approach of the Second Sun
7.9%inclusion3 decks38 decks
4%synergy
Glimpse the Unthinkable
7.9%inclusion3 decks38 decks
7%synergy
Brilliant Restoration
7.9%inclusion3 decks38 decks
6%synergy
Traumatize
7.9%inclusion3 decks38 decks
7%synergy
Stock Up
6.3%inclusion2 decks32 decks
4%synergy
Ponder
5.3%inclusion2 decks38 decks
-4%synergy
Identity Crisis
5.3%inclusion2 decks38 decks
5%synergy
Unmarked Grave
5.3%inclusion2 decks38 decks
4%synergy
Austere Command
5.3%inclusion2 decks38 decks
-4%synergy
Lively Dirge
5.3%inclusion2 decks38 decks
4%synergy
Diabolic Tutor
5.3%inclusion2 decks38 decks
1%synergy
Ghostform
5.3%inclusion2 decks38 decks
5%synergy
Breach the Multiverse
5.3%inclusion2 decks38 decks
3%synergy
Haunting Misery
5.3%inclusion2 decks38 decks
5%synergy
Diresight
5.3%inclusion2 decks38 decks
5%synergy
Grim Tutor
5.3%inclusion2 decks38 decks
1%synergy
Utility Artifacts
Mesmeric Orb
29%inclusion11 decks38 decks
28%synergy
Lightning Greaves
18%inclusion7 decks38 decks
-4%synergy
Cloud Key
13%inclusion5 decks38 decks
10%synergy
Swiftfoot Boots
11%inclusion4 decks38 decks
-13%synergy
Whip of Erebos
7.9%inclusion3 decks38 decks
6%synergy
Crucible of Worlds
5.3%inclusion2 decks38 decks
4%synergy
Altar of the Brood
5.3%inclusion2 decks38 decks
4%synergy
The Book of Exalted Deeds
5.3%inclusion2 decks38 decks
5%synergy
Book of Rass
5.3%inclusion2 decks38 decks
5%synergy
Archaeomancer's Map
5.3%inclusion2 decks38 decks
0%synergy
The Book of Vile Darkness
5.3%inclusion2 decks38 decks
5%synergy
Perpetual Timepiece
5.3%inclusion2 decks38 decks
5%synergy
Orazca Puzzle-Door
5.3%inclusion2 decks38 decks
5%synergy
Palantír of Orthanc
5.3%inclusion2 decks38 decks
4%synergy
Rishadan Pawnshop
5.3%inclusion2 decks38 decks
5%synergy
Cellar Door
5.3%inclusion2 decks38 decks
5%synergy
Enchantments
Mirrormade
47%inclusion18 decks38 decks
38%synergy
Ghostly Prison
47%inclusion18 decks38 decks
26%synergy
Propaganda
45%inclusion17 decks38 decks
18%synergy
Cemetery Tampering
39%inclusion15 decks38 decks
39%synergy
Black Market Connections
39%inclusion15 decks38 decks
25%synergy
Hallowed Haunting
37%inclusion14 decks38 decks
34%synergy
Amphibian Downpour
34%inclusion13 decks38 decks
30%synergy
Estrid's Invocation
34%inclusion13 decks38 decks
30%synergy
Sphere of Safety
34%inclusion13 decks38 decks
25%synergy
Polluted Cistern // Dim Oubliette
34%inclusion13 decks38 decks
34%synergy
Darksteel Mutation
32%inclusion12 decks38 decks
25%synergy
Sigil of the Empty Throne
32%inclusion12 decks38 decks
26%synergy
Dance of the Dead
32%inclusion12 decks38 decks
29%synergy
Blind Obedience
32%inclusion12 decks38 decks
19%synergy
Sheltered by Ghosts
32%inclusion12 decks38 decks
29%synergy
Monologue Tax
29%inclusion11 decks38 decks
23%synergy
Greater Auramancy
29%inclusion11 decks38 decks
25%synergy
The Meathook Massacre
29%inclusion11 decks38 decks
26%synergy
Out of the Tombs
26%inclusion10 decks38 decks
26%synergy
Copy Enchantment
26%inclusion10 decks38 decks
22%synergy
Imprisoned in the Moon
26%inclusion10 decks38 decks
20%synergy
Mirror Room // Fractured Realm
26%inclusion10 decks38 decks
24%synergy
Teval's Judgment
26%inclusion7 decks27 decks
25%synergy
Stillness in Motion
26%inclusion7 decks27 decks
26%synergy
Touch the Spirit Realm
21%inclusion8 decks38 decks
19%synergy
Shark Typhoon
21%inclusion8 decks38 decks
15%synergy
Secrets of the Dead
21%inclusion8 decks38 decks
21%synergy
Phyrexian Arena
18%inclusion7 decks38 decks
4%synergy
Seal of Removal
18%inclusion7 decks38 decks
18%synergy
Defiled Crypt // Cadaver Lab
18%inclusion7 decks38 decks
18%synergy
Central Elevator // Promising Stairs
18%inclusion7 decks38 decks
18%synergy
The Tale of Tamiyo
18%inclusion7 decks38 decks
18%synergy
Aura of Silence
18%inclusion7 decks38 decks
15%synergy
Static Prison
16%inclusion6 decks38 decks
15%synergy
Restricted Office // Lecture Hall
16%inclusion6 decks38 decks
14%synergy
Trouble in Pairs
16%inclusion6 decks38 decks
10%synergy
Cramped Vents // Access Maze
13%inclusion5 decks38 decks
11%synergy
All That Glitters
13%inclusion5 decks38 decks
4%synergy
Leyline of Anticipation
13%inclusion5 decks38 decks
9%synergy
Funeral Room // Awakening Hall
13%inclusion5 decks38 decks
12%synergy
Oubliette
13%inclusion5 decks38 decks
12%synergy
Solitary Confinement
13%inclusion5 decks38 decks
11%synergy
Underwater Tunnel // Slimy Aquarium
13%inclusion5 decks38 decks
13%synergy
Nowhere to Run
13%inclusion5 decks38 decks
12%synergy
Court of Cunning
11%inclusion4 decks38 decks
10%synergy
Court of Ardenvale
11%inclusion4 decks38 decks
10%synergy
Painful Quandary
11%inclusion4 decks38 decks
8%synergy
Extravagant Replication
11%inclusion4 decks38 decks
5%synergy
Court of Vantress
11%inclusion4 decks38 decks
8%synergy
Bottomless Pool // Locker Room
11%inclusion4 decks38 decks
9%synergy
Battles
Invasion of Theros
11%inclusion4 decks38 decks
9%synergy
Planeswalkers
Jace, Wielder of Mysteries
7.9%inclusion3 decks38 decks
6%synergy
Teferi, Time Raveler
7.9%inclusion3 decks38 decks
-1%synergy
Jace, the Perfected Mind
5.3%inclusion2 decks38 decks
5%synergy
Utility Lands
Bojuka Bog
42%inclusion16 decks38 decks
15%synergy
Otawara, Soaring City
42%inclusion16 decks38 decks
23%synergy
Takenuma, Abandoned Mire
29%inclusion11 decks38 decks
22%synergy
Adagia, Windswept Bastion
24%inclusion4 decks17 decks
21%synergy
Reliquary Tower
21%inclusion8 decks38 decks
-13%synergy
Urborg, Tomb of Yawgmoth
21%inclusion8 decks38 decks
8%synergy
Cephalid Coliseum
16%inclusion6 decks38 decks
12%synergy
Urza's Saga
11%inclusion4 decks38 decks
-1%synergy
Maze of Ith
7.9%inclusion3 decks38 decks
5%synergy
Halimar Depths
7.9%inclusion3 decks38 decks
3%synergy
Ghost Quarter
7.9%inclusion3 decks38 decks
7%synergy
Castle Locthwain
5.3%inclusion2 decks38 decks
4%synergy
Drownyard Temple
5.3%inclusion2 decks38 decks
5%synergy
Rogue's Passage
5.3%inclusion2 decks38 decks
-4%synergy
Restless Reef
5.3%inclusion2 decks38 decks
4%synergy
War Room
5.3%inclusion2 decks38 decks
5%synergy
Mana Artifacts
Sol Ring
74%inclusion28 decks38 decks
-16%synergy
Arcane Signet
71%inclusion27 decks38 decks
-17%synergy
Talisman of Dominance
53%inclusion20 decks38 decks
3%synergy
Talisman of Hierarchy
47%inclusion18 decks38 decks
4%synergy
Talisman of Progress
45%inclusion17 decks38 decks
1%synergy
Orzhov Signet
26%inclusion10 decks38 decks
-7%synergy
Fellwar Stone
26%inclusion10 decks38 decks
-7%synergy
Azorius Signet
26%inclusion10 decks38 decks
-5%synergy
Dimir Signet
24%inclusion9 decks38 decks
-8%synergy
Thran Dynamo
5.3%inclusion2 decks38 decks
2%synergy
Lotus Petal
5.3%inclusion2 decks38 decks
-5%synergy
Lands
Command Tower
97%inclusion37 decks38 decks
5%synergy
Plains
97%inclusion37 decks38 decks
6%synergy
Island
95%inclusion36 decks38 decks
2%synergy
Swamp
89%inclusion34 decks38 decks
-2%synergy
Hallowed Fountain
84%inclusion32 decks38 decks
35%synergy
Flooded Strand
84%inclusion32 decks38 decks
46%synergy
Polluted Delta
82%inclusion31 decks38 decks
44%synergy
Watery Grave
82%inclusion31 decks38 decks
31%synergy
Godless Shrine
79%inclusion30 decks38 decks
28%synergy
Marsh Flats
79%inclusion30 decks38 decks
43%synergy
Raffine's Tower
71%inclusion27 decks38 decks
30%synergy
Shadowy Backstreet
68%inclusion26 decks38 decks
56%synergy
Sea of Clouds
66%inclusion25 decks38 decks
30%synergy
Undercity Sewers
66%inclusion25 decks38 decks
52%synergy
Morphic Pool
66%inclusion25 decks38 decks
32%synergy
Meticulous Archive
63%inclusion24 decks38 decks
49%synergy
Vault of Champions
61%inclusion23 decks38 decks
28%synergy
Adarkar Wastes
50%inclusion19 decks38 decks
19%synergy
Exotic Orchard
47%inclusion18 decks38 decks
-11%synergy
Caves of Koilos
47%inclusion18 decks38 decks
12%synergy
Underground River
42%inclusion16 decks38 decks
9%synergy
Drowned Catacomb
42%inclusion16 decks38 decks
6%synergy
Glacial Fortress
39%inclusion15 decks38 decks
-1%synergy
Shipwreck Marsh
39%inclusion15 decks38 decks
19%synergy
Isolated Chapel
37%inclusion14 decks38 decks
-2%synergy
Deserted Beach
37%inclusion14 decks38 decks
16%synergy
Arcane Sanctum
34%inclusion13 decks38 decks
-20%synergy
Valgavoth's Lair
32%inclusion12 decks38 decks
29%synergy
Scrubland
32%inclusion12 decks38 decks
16%synergy
Gloomlake Verge
32%inclusion12 decks38 decks
21%synergy
Tundra
32%inclusion12 decks38 decks
16%synergy
Underground Sea
29%inclusion11 decks38 decks
13%synergy
Floodfarm Verge
29%inclusion11 decks38 decks
18%synergy
Bleachbone Verge
25%inclusion8 decks32 decks
16%synergy
Verdant Catacombs
24%inclusion9 decks38 decks
13%synergy
Misty Rainforest
24%inclusion9 decks38 decks
12%synergy
Shattered Sanctum
24%inclusion9 decks38 decks
8%synergy
Bloodstained Mire
24%inclusion9 decks38 decks
13%synergy
Fell the Profane
21%inclusion8 decks38 decks
12%synergy
Scalding Tarn
21%inclusion8 decks38 decks
10%synergy
Sunken Hollow
21%inclusion8 decks38 decks
-19%synergy
Witch Enchanter
18%inclusion7 decks38 decks
12%synergy
Dimir Aqueduct
18%inclusion7 decks38 decks
5%synergy
Prairie Stream
18%inclusion7 decks38 decks
-22%synergy
Arid Mesa
18%inclusion7 decks38 decks
9%synergy
Azorius Chancery
18%inclusion7 decks38 decks
4%synergy
Windswept Heath
18%inclusion7 decks38 decks
9%synergy
Orzhov Basilica
16%inclusion6 decks38 decks
0%synergy
City of Brass
16%inclusion6 decks38 decks
1%synergy
Sink into Stupor
16%inclusion6 decks38 decks
3%synergy
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