The Master of Keys (Commander) - Expensive Core

The Master of Keys
Rank #300
42decks
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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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Emeritus of Truce
25%inclusion1 decks4 decks
24%synergy
Umbral Expanse
20%inclusion1 decks5 decks
19%synergy
Emeritus of Ideation
20%inclusion1 decks5 decks
19%synergy
High Synergy Cards
Ripples of Undeath
71%inclusion30 decks42 decks
69%synergy
Entity Tracker
67%inclusion28 decks42 decks
61%synergy
Animate Dead
67%inclusion28 decks42 decks
57%synergy
Inquisitive Glimmer
64%inclusion27 decks42 decks
57%synergy
Hall of Heliod's Generosity
69%inclusion29 decks42 decks
56%synergy
Grasp of Fate
62%inclusion26 decks42 decks
56%synergy
Demon of Fate's Design
60%inclusion25 decks42 decks
54%synergy
Gravebreaker Lamia
55%inclusion23 decks42 decks
54%synergy
Mesa Enchantress
62%inclusion26 decks42 decks
53%synergy
Necromancy
57%inclusion24 decks42 decks
53%synergy
Top Cards
Overlord of the Floodpits
52%inclusion22 decks42 decks
49%synergy
Starfield of Nyx
52%inclusion22 decks42 decks
48%synergy
Overlord of the Balemurk
52%inclusion22 decks42 decks
51%synergy
Secret Arcade // Dusty Parlor
52%inclusion22 decks42 decks
48%synergy
Cacophony Unleashed
50%inclusion21 decks42 decks
48%synergy
Starfield Mystic
48%inclusion20 decks42 decks
41%synergy
Mystic Remora
48%inclusion20 decks42 decks
27%synergy
Dress Down
48%inclusion20 decks42 decks
45%synergy
Mirrormade
45%inclusion19 decks42 decks
35%synergy
Fear of Sleep Paralysis
45%inclusion19 decks42 decks
40%synergy
Game Changers
Notion Thief
7.1%inclusion3 decks42 decks
0%synergy
Necropotence
7.1%inclusion3 decks42 decks
1%synergy
Creatures
Fear of Impostors
45%inclusion19 decks42 decks
44%synergy
Doomwake Giant
43%inclusion18 decks42 decks
37%synergy
Scrabbling Skullcrab
40%inclusion17 decks42 decks
40%synergy
Zur, Eternal Schemer
40%inclusion17 decks42 decks
37%synergy
Ondu Spiritdancer
40%inclusion17 decks42 decks
34%synergy
Victor, Valgavoth's Seneschal
38%inclusion16 decks42 decks
36%synergy
Heliod, the Radiant Dawn
36%inclusion15 decks42 decks
32%synergy
Grim Guardian
33%inclusion14 decks42 decks
31%synergy
Enduring Curiosity
29%inclusion12 decks42 decks
21%synergy
Silent Hallcreeper
26%inclusion11 decks42 decks
22%synergy
Zur the Enchanter
26%inclusion11 decks42 decks
21%synergy
Summon: Yojimbo
25%inclusion7 decks28 decks
24%synergy
Overlord of the Mistmoors
24%inclusion10 decks42 decks
22%synergy
Archon of Sun's Grace
21%inclusion9 decks42 decks
17%synergy
Soaring Lightbringer
21%inclusion9 decks42 decks
17%synergy
Ghostly Dancers
21%inclusion9 decks42 decks
19%synergy
Lotho, Corrupt Shirriff
19%inclusion8 decks42 decks
2%synergy
Moon-Blessed Cleric
19%inclusion8 decks42 decks
14%synergy
Witch Enchanter
17%inclusion7 decks42 decks
10%synergy
Sage of Mysteries
17%inclusion7 decks42 decks
16%synergy
Balemurk Leech
17%inclusion7 decks42 decks
16%synergy
Esper Sentinel
14%inclusion6 decks42 decks
-13%synergy
Grand Abolisher
14%inclusion6 decks42 decks
0%synergy
Skullsnap Nuisance
14%inclusion6 decks42 decks
14%synergy
Aminatou, Veil Piercer
14%inclusion6 decks42 decks
13%synergy
Spirited Companion
12%inclusion5 decks42 decks
10%synergy
Alseid of Life's Bounty
12%inclusion5 decks42 decks
11%synergy
Hedron Crab
12%inclusion5 decks42 decks
11%synergy
Sun Titan
12%inclusion5 decks42 decks
4%synergy
Abdel Adrian, Gorion's Ward
12%inclusion5 decks42 decks
10%synergy
Summon: Valefor
11%inclusion3 decks28 decks
10%synergy
Doom Whisperer
10%inclusion4 decks42 decks
8%synergy
Boggart Trawler
10%inclusion4 decks42 decks
6%synergy
Athreos, Shroud-Veiled
10%inclusion4 decks42 decks
5%synergy
Archetype of Imagination
10%inclusion4 decks42 decks
5%synergy
Ancient Cellarspawn
10%inclusion4 decks42 decks
7%synergy
Valgavoth, Terror Eater
10%inclusion4 decks42 decks
6%synergy
Auramancer
10%inclusion4 decks42 decks
7%synergy
Glasspool Mimic
10%inclusion4 decks42 decks
7%synergy
Mindwrack Harpy
10%inclusion4 decks42 decks
9%synergy
Astelli Reclaimer
9.1%inclusion2 decks22 decks
9%synergy
Eidolon of Astral Winds
7.5%inclusion3 decks40 decks
7%synergy
Metamorphosis Fanatic
7.1%inclusion3 decks42 decks
3%synergy
Enduring Innocence
7.1%inclusion3 decks42 decks
6%synergy
Nashi, Searcher in the Dark
7.1%inclusion3 decks42 decks
7%synergy
Faith Healer
7.1%inclusion3 decks42 decks
7%synergy
Summon: Bahamut
7.1%inclusion2 decks28 decks
6%synergy
Summon: Primal Odin
7.1%inclusion2 decks28 decks
3%synergy
Summon: Anima
7.1%inclusion2 decks28 decks
7%synergy
Summon: Primal Garuda
7.1%inclusion2 decks28 decks
7%synergy
Instants
Swords to Plowshares
43%inclusion18 decks42 decks
-25%synergy
An Offer You Can't Refuse
33%inclusion14 decks42 decks
6%synergy
Entomb
31%inclusion13 decks42 decks
24%synergy
Counterspell
31%inclusion13 decks42 decks
-11%synergy
Arcane Denial
26%inclusion11 decks42 decks
6%synergy
Path to Exile
26%inclusion11 decks42 decks
-16%synergy
Swan Song
26%inclusion11 decks42 decks
6%synergy
Dark Ritual
19%inclusion8 decks42 decks
-1%synergy
Fell the Profane
17%inclusion7 decks42 decks
8%synergy
Frantic Search
14%inclusion6 decks42 decks
-4%synergy
Dovin's Veto
14%inclusion6 decks42 decks
-12%synergy
Void Rend
14%inclusion6 decks42 decks
-20%synergy
Mana Drain
14%inclusion6 decks42 decks
-3%synergy
Sink into Stupor
14%inclusion6 decks42 decks
1%synergy
Inkshield
14%inclusion6 decks42 decks
5%synergy
Dawn's Truce
12%inclusion5 decks42 decks
7%synergy
Brainstorm
10%inclusion4 decks42 decks
-7%synergy
Thought Scour
10%inclusion4 decks42 decks
9%synergy
Silence
10%inclusion4 decks42 decks
0%synergy
Anguished Unmaking
10%inclusion4 decks42 decks
-16%synergy
Otherworldly Gaze
10%inclusion4 decks42 decks
7%synergy
Thirst for Meaning
10%inclusion4 decks42 decks
8%synergy
Fact or Fiction
7.1%inclusion3 decks42 decks
4%synergy
Force of Negation
7.1%inclusion3 decks42 decks
-5%synergy
Sejiri Shelter
7.1%inclusion3 decks42 decks
5%synergy
Slip Out the Back
7.1%inclusion3 decks42 decks
6%synergy
Generous Gift
7.1%inclusion3 decks42 decks
-7%synergy
Sorceries
Sevinne's Reclamation
43%inclusion18 decks42 decks
34%synergy
Redress Fate
40%inclusion17 decks42 decks
35%synergy
Reanimate
33%inclusion14 decks42 decks
17%synergy
Windfall
31%inclusion13 decks42 decks
18%synergy
Dance of the Manse
26%inclusion11 decks42 decks
23%synergy
Toxic Deluge
21%inclusion9 decks42 decks
2%synergy
Replenish
17%inclusion7 decks42 decks
15%synergy
Damn
17%inclusion7 decks42 decks
-4%synergy
Idyllic Tutor
14%inclusion6 decks42 decks
10%synergy
Space-Time Anomaly
14%inclusion3 decks22 decks
12%synergy
Extinguish All Hope
12%inclusion5 decks42 decks
10%synergy
Resurgent Belief
10%inclusion4 decks42 decks
8%synergy
Glimpse the Unthinkable
10%inclusion4 decks42 decks
9%synergy
Traumatize
10%inclusion4 decks42 decks
9%synergy
Ponder
7.1%inclusion3 decks42 decks
-2%synergy
Supreme Verdict
7.1%inclusion3 decks42 decks
-8%synergy
Open the Vaults
7.1%inclusion3 decks42 decks
6%synergy
Dread Return
7.1%inclusion3 decks42 decks
5%synergy
Cut Your Losses
7.1%inclusion3 decks42 decks
7%synergy
Brilliant Restoration
7.1%inclusion3 decks42 decks
5%synergy
Approach of the Second Sun
7.1%inclusion3 decks42 decks
4%synergy
Stock Up
5.6%inclusion2 decks36 decks
3%synergy
Utility Artifacts
Mesmeric Orb
29%inclusion12 decks42 decks
27%synergy
Lightning Greaves
17%inclusion7 decks42 decks
-6%synergy
Cloud Key
14%inclusion6 decks42 decks
11%synergy
Swiftfoot Boots
10%inclusion4 decks42 decks
-15%synergy
Whip of Erebos
7.1%inclusion3 decks42 decks
5%synergy
Enchantments
Seal of Cleansing
45%inclusion19 decks42 decks
44%synergy
Ghostly Prison
43%inclusion18 decks42 decks
20%synergy
Propaganda
43%inclusion18 decks42 decks
15%synergy
Cemetery Tampering
38%inclusion16 decks42 decks
37%synergy
Black Market Connections
38%inclusion16 decks42 decks
23%synergy
Hallowed Haunting
36%inclusion15 decks42 decks
33%synergy
Sphere of Safety
36%inclusion15 decks42 decks
26%synergy
Sigil of the Empty Throne
33%inclusion14 decks42 decks
28%synergy
Estrid's Invocation
33%inclusion14 decks42 decks
29%synergy
Amphibian Downpour
33%inclusion14 decks42 decks
29%synergy
Darksteel Mutation
31%inclusion13 decks42 decks
25%synergy
Dance of the Dead
31%inclusion13 decks42 decks
29%synergy
Polluted Cistern // Dim Oubliette
31%inclusion13 decks42 decks
30%synergy
Sheltered by Ghosts
31%inclusion13 decks42 decks
28%synergy
Greater Auramancy
31%inclusion13 decks42 decks
27%synergy
The Meathook Massacre
29%inclusion12 decks42 decks
25%synergy
Monologue Tax
29%inclusion12 decks42 decks
22%synergy
Blind Obedience
29%inclusion12 decks42 decks
17%synergy
Mirror Room // Fractured Realm
29%inclusion12 decks42 decks
26%synergy
Stillness in Motion
27%inclusion8 decks30 decks
26%synergy
Out of the Tombs
26%inclusion11 decks42 decks
26%synergy
Imprisoned in the Moon
24%inclusion10 decks42 decks
17%synergy
Teval's Judgment
23%inclusion7 decks30 decks
23%synergy
Copy Enchantment
21%inclusion9 decks42 decks
17%synergy
Shark Typhoon
21%inclusion9 decks42 decks
16%synergy
Central Elevator // Promising Stairs
19%inclusion8 decks42 decks
18%synergy
Aura of Silence
19%inclusion8 decks42 decks
16%synergy
Phyrexian Arena
19%inclusion8 decks42 decks
5%synergy
Secrets of the Dead
19%inclusion8 decks42 decks
19%synergy
Touch the Spirit Realm
17%inclusion7 decks42 decks
14%synergy
Restricted Office // Lecture Hall
17%inclusion7 decks42 decks
15%synergy
Defiled Crypt // Cadaver Lab
17%inclusion7 decks42 decks
16%synergy
Cramped Vents // Access Maze
14%inclusion6 decks42 decks
12%synergy
The Tale of Tamiyo
14%inclusion6 decks42 decks
14%synergy
Funeral Room // Awakening Hall
14%inclusion6 decks42 decks
13%synergy
Oubliette
14%inclusion6 decks42 decks
13%synergy
Solitary Confinement
14%inclusion6 decks42 decks
12%synergy
Trouble in Pairs
14%inclusion6 decks42 decks
9%synergy
Underwater Tunnel // Slimy Aquarium
12%inclusion5 decks42 decks
12%synergy
Extravagant Replication
12%inclusion5 decks42 decks
7%synergy
Leyline of Anticipation
12%inclusion5 decks42 decks
8%synergy
Bottomless Pool // Locker Room
12%inclusion5 decks42 decks
10%synergy
All That Glitters
12%inclusion5 decks42 decks
3%synergy
Land Tax
12%inclusion5 decks42 decks
6%synergy
Nowhere to Run
12%inclusion5 decks42 decks
11%synergy
Seal of Removal
12%inclusion5 decks42 decks
11%synergy
Glasswing Grace
10%inclusion4 decks42 decks
7%synergy
The Eldest Reborn
10%inclusion4 decks42 decks
7%synergy
Authority of the Consuls
10%inclusion4 decks42 decks
-3%synergy
Derelict Attic // Widow's Walk
10%inclusion4 decks42 decks
9%synergy
Battles
Invasion of Theros
10%inclusion4 decks42 decks
8%synergy
Planeswalkers
Jace, Wielder of Mysteries
7.1%inclusion3 decks42 decks
5%synergy
Utility Lands
Otawara, Soaring City
45%inclusion19 decks42 decks
26%synergy
Bojuka Bog
43%inclusion18 decks42 decks
16%synergy
Takenuma, Abandoned Mire
29%inclusion12 decks42 decks
22%synergy
Reliquary Tower
19%inclusion8 decks42 decks
-15%synergy
Urborg, Tomb of Yawgmoth
19%inclusion8 decks42 decks
6%synergy
Adagia, Windswept Bastion
18%inclusion4 decks22 decks
16%synergy
Cephalid Coliseum
14%inclusion6 decks42 decks
11%synergy
Urza's Saga
10%inclusion4 decks42 decks
-2%synergy
Halimar Depths
10%inclusion4 decks42 decks
5%synergy
Ghost Quarter
7.1%inclusion3 decks42 decks
6%synergy
Maze of Ith
7.1%inclusion3 decks42 decks
4%synergy
Mana Artifacts
Arcane Signet
71%inclusion30 decks42 decks
-16%synergy
Sol Ring
69%inclusion29 decks42 decks
-21%synergy
Talisman of Dominance
45%inclusion19 decks42 decks
-5%synergy
Talisman of Hierarchy
40%inclusion17 decks42 decks
-4%synergy
Talisman of Progress
38%inclusion16 decks42 decks
-6%synergy
Orzhov Signet
26%inclusion11 decks42 decks
-6%synergy
Azorius Signet
26%inclusion11 decks42 decks
-4%synergy
Fellwar Stone
21%inclusion9 decks42 decks
-12%synergy
Dimir Signet
21%inclusion9 decks42 decks
-9%synergy
Lotus Petal
7.1%inclusion3 decks42 decks
-3%synergy
Lands
Command Tower
98%inclusion41 decks42 decks
5%synergy
Plains
98%inclusion41 decks42 decks
6%synergy
Island
95%inclusion40 decks42 decks
2%synergy
Swamp
90%inclusion38 decks42 decks
-1%synergy
Flooded Strand
86%inclusion36 decks42 decks
47%synergy
Polluted Delta
83%inclusion35 decks42 decks
45%synergy
Hallowed Fountain
83%inclusion35 decks42 decks
33%synergy
Watery Grave
81%inclusion34 decks42 decks
30%synergy
Godless Shrine
79%inclusion33 decks42 decks
27%synergy
Marsh Flats
79%inclusion33 decks42 decks
43%synergy
Raffine's Tower
71%inclusion30 decks42 decks
31%synergy
Shadowy Backstreet
69%inclusion29 decks42 decks
56%synergy
Undercity Sewers
67%inclusion28 decks42 decks
52%synergy
Sea of Clouds
64%inclusion27 decks42 decks
29%synergy
Morphic Pool
64%inclusion27 decks42 decks
31%synergy
Meticulous Archive
64%inclusion27 decks42 decks
50%synergy
Vault of Champions
60%inclusion25 decks42 decks
27%synergy
Adarkar Wastes
50%inclusion21 decks42 decks
18%synergy
Exotic Orchard
43%inclusion18 decks42 decks
-16%synergy
Caves of Koilos
43%inclusion18 decks42 decks
7%synergy
Underground River
43%inclusion18 decks42 decks
9%synergy
Drowned Catacomb
38%inclusion16 decks42 decks
0%synergy
Glacial Fortress
36%inclusion15 decks42 decks
-7%synergy
Isolated Chapel
36%inclusion15 decks42 decks
-5%synergy
Arcane Sanctum
36%inclusion15 decks42 decks
-19%synergy
Gloomlake Verge
36%inclusion15 decks42 decks
25%synergy
Shipwreck Marsh
33%inclusion14 decks42 decks
13%synergy
Tundra
31%inclusion13 decks42 decks
15%synergy
Valgavoth's Lair
31%inclusion13 decks42 decks
28%synergy
Scrubland
31%inclusion13 decks42 decks
15%synergy
Deserted Beach
31%inclusion13 decks42 decks
10%synergy
Floodfarm Verge
31%inclusion13 decks42 decks
20%synergy
Underground Sea
29%inclusion12 decks42 decks
13%synergy
Bleachbone Verge
28%inclusion10 decks36 decks
19%synergy
Bloodstained Mire
24%inclusion10 decks42 decks
13%synergy
Misty Rainforest
21%inclusion9 decks42 decks
11%synergy
Verdant Catacombs
21%inclusion9 decks42 decks
12%synergy
Shattered Sanctum
21%inclusion9 decks42 decks
5%synergy
Sunken Hollow
21%inclusion9 decks42 decks
-18%synergy
Windswept Heath
19%inclusion8 decks42 decks
10%synergy
Prairie Stream
19%inclusion8 decks42 decks
-22%synergy
Arid Mesa
19%inclusion8 decks42 decks
10%synergy
Scalding Tarn
19%inclusion8 decks42 decks
8%synergy
Witch Enchanter
17%inclusion7 decks42 decks
10%synergy
Fell the Profane
17%inclusion7 decks42 decks
8%synergy
Azorius Chancery
17%inclusion7 decks42 decks
3%synergy
Dimir Aqueduct
17%inclusion7 decks42 decks
4%synergy
Prismatic Vista
14%inclusion6 decks42 decks
10%synergy
Fabled Passage
14%inclusion6 decks42 decks
7%synergy
Orzhov Basilica
14%inclusion6 decks42 decks
-1%synergy
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