The Master of Keys (Commander) - Expensive Core

The Master of Keys
Rank #301
43decks
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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
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Eiganjo Dynastorian
20%inclusion2 decks10 decks
19%synergy
Bilbo, Thief in the Night
20%inclusion1 decks5 decks
20%synergy
Emeritus of Truce
13%inclusion1 decks8 decks
11%synergy
Emeritus of Ideation
10%inclusion1 decks10 decks
9%synergy
Grave Researcher
10%inclusion1 decks10 decks
8%synergy
High Synergy Cards
Ripples of Undeath
74%inclusion32 decks43 decks
72%synergy
Inquisitive Glimmer
67%inclusion29 decks43 decks
60%synergy
Hall of Heliod's Generosity
70%inclusion30 decks43 decks
57%synergy
Entity Tracker
63%inclusion27 decks43 decks
57%synergy
Necromancy
60%inclusion26 decks43 decks
56%synergy
Animate Dead
65%inclusion28 decks43 decks
56%synergy
Demon of Fate's Design
58%inclusion25 decks43 decks
53%synergy
Gravebreaker Lamia
53%inclusion23 decks43 decks
52%synergy
Starfield of Nyx
56%inclusion24 decks43 decks
52%synergy
Mesa Enchantress
60%inclusion26 decks43 decks
52%synergy
Top Cards
Starfield Mystic
56%inclusion24 decks43 decks
49%synergy
Grasp of Fate
53%inclusion23 decks43 decks
47%synergy
Overlord of the Floodpits
49%inclusion21 decks43 decks
45%synergy
Fear of Impostors
49%inclusion21 decks43 decks
47%synergy
Overlord of the Balemurk
49%inclusion21 decks43 decks
47%synergy
Cacophony Unleashed
47%inclusion20 decks43 decks
45%synergy
Mirrormade
47%inclusion20 decks43 decks
37%synergy
Doomwake Giant
47%inclusion20 decks43 decks
41%synergy
Dress Down
47%inclusion20 decks43 decks
44%synergy
Sevinne's Reclamation
44%inclusion19 decks43 decks
35%synergy
Game Changers
Notion Thief
7.0%inclusion3 decks43 decks
0%synergy
Creatures
Fear of Sleep Paralysis
44%inclusion19 decks43 decks
39%synergy
Zur, Eternal Schemer
44%inclusion19 decks43 decks
41%synergy
Ondu Spiritdancer
44%inclusion19 decks43 decks
38%synergy
Scrabbling Skullcrab
42%inclusion18 decks43 decks
41%synergy
Victor, Valgavoth's Seneschal
33%inclusion14 decks43 decks
31%synergy
Grim Guardian
33%inclusion14 decks43 decks
30%synergy
Heliod, the Radiant Dawn
30%inclusion13 decks43 decks
27%synergy
Silent Hallcreeper
28%inclusion12 decks43 decks
23%synergy
Enduring Curiosity
28%inclusion12 decks43 decks
20%synergy
Summon: Yojimbo
24%inclusion7 decks29 decks
23%synergy
Archon of Sun's Grace
23%inclusion10 decks43 decks
19%synergy
Soaring Lightbringer
23%inclusion10 decks43 decks
19%synergy
Ghostly Dancers
23%inclusion10 decks43 decks
21%synergy
Zur the Enchanter
23%inclusion10 decks43 decks
18%synergy
Sage of Mysteries
21%inclusion9 decks43 decks
21%synergy
Overlord of the Mistmoors
21%inclusion9 decks43 decks
19%synergy
Lotho, Corrupt Shirriff
16%inclusion7 decks43 decks
-1%synergy
Moon-Blessed Cleric
16%inclusion7 decks43 decks
12%synergy
Alseid of Life's Bounty
16%inclusion7 decks43 decks
15%synergy
Hedron Crab
16%inclusion7 decks43 decks
16%synergy
Aminatou, Veil Piercer
16%inclusion7 decks43 decks
15%synergy
Witch Enchanter
14%inclusion6 decks43 decks
7%synergy
Doom Whisperer
14%inclusion6 decks43 decks
12%synergy
Balemurk Leech
14%inclusion6 decks43 decks
13%synergy
Esper Sentinel
12%inclusion5 decks43 decks
-16%synergy
Skullsnap Nuisance
12%inclusion5 decks43 decks
11%synergy
Sun Titan
12%inclusion5 decks43 decks
4%synergy
Ancient Cellarspawn
12%inclusion5 decks43 decks
9%synergy
Grand Abolisher
12%inclusion5 decks43 decks
-3%synergy
Mindwrack Harpy
12%inclusion5 decks43 decks
11%synergy
Athreos, Shroud-Veiled
12%inclusion5 decks43 decks
7%synergy
Valgavoth, Terror Eater
12%inclusion5 decks43 decks
8%synergy
Millikin
12%inclusion5 decks43 decks
11%synergy
Summon: Valefor
10%inclusion3 decks29 decks
10%synergy
Summon: Knights of Round
10%inclusion3 decks29 decks
8%synergy
Metamorphosis Fanatic
9.3%inclusion4 decks43 decks
5%synergy
Spirited Companion
9.3%inclusion4 decks43 decks
8%synergy
Archetype of Imagination
9.3%inclusion4 decks43 decks
5%synergy
Loran of the Third Path
9.3%inclusion4 decks43 decks
6%synergy
Abdel Adrian, Gorion's Ward
9.3%inclusion4 decks43 decks
8%synergy
Enduring Innocence
9.3%inclusion4 decks43 decks
8%synergy
Deranged Assistant
9.3%inclusion4 decks43 decks
9%synergy
Auramancer
9.3%inclusion4 decks43 decks
6%synergy
Eidolon of Astral Winds
7.3%inclusion3 decks41 decks
7%synergy
Phenax, God of Deception
7.0%inclusion3 decks43 decks
7%synergy
Boggart Trawler
7.0%inclusion3 decks43 decks
4%synergy
Massacre Wurm
7.0%inclusion3 decks43 decks
4%synergy
Braids, Arisen Nightmare
7.0%inclusion3 decks43 decks
6%synergy
Ledger Shredder
7.0%inclusion3 decks43 decks
-2%synergy
Secret Door
7.0%inclusion3 decks43 decks
7%synergy
Instants
Swords to Plowshares
37%inclusion16 decks43 decks
-31%synergy
An Offer You Can't Refuse
28%inclusion12 decks43 decks
0%synergy
Entomb
26%inclusion11 decks43 decks
19%synergy
Swan Song
26%inclusion11 decks43 decks
6%synergy
Counterspell
26%inclusion11 decks43 decks
-16%synergy
Arcane Denial
26%inclusion11 decks43 decks
5%synergy
Path to Exile
23%inclusion10 decks43 decks
-19%synergy
Fell the Profane
19%inclusion8 decks43 decks
10%synergy
Frantic Search
19%inclusion8 decks43 decks
0%synergy
Dark Ritual
19%inclusion8 decks43 decks
-1%synergy
Dovin's Veto
14%inclusion6 decks43 decks
-12%synergy
Mana Drain
14%inclusion6 decks43 decks
-3%synergy
Sink into Stupor
14%inclusion6 decks43 decks
1%synergy
Void Rend
12%inclusion5 decks43 decks
-23%synergy
Inkshield
12%inclusion5 decks43 decks
2%synergy
Otherworldly Gaze
12%inclusion5 decks43 decks
9%synergy
Dawn's Truce
9.3%inclusion4 decks43 decks
5%synergy
Slip Out the Back
9.3%inclusion4 decks43 decks
8%synergy
Silence
9.3%inclusion4 decks43 decks
-1%synergy
Brainstorm
7.0%inclusion3 decks43 decks
-10%synergy
Thirst for Meaning
7.0%inclusion3 decks43 decks
6%synergy
Fact or Fiction
7.0%inclusion3 decks43 decks
3%synergy
Thought Scour
7.0%inclusion3 decks43 decks
6%synergy
Anguished Unmaking
7.0%inclusion3 decks43 decks
-19%synergy
Force of Negation
7.0%inclusion3 decks43 decks
-5%synergy
Generous Gift
7.0%inclusion3 decks43 decks
-7%synergy
Sorceries
Redress Fate
37%inclusion16 decks43 decks
32%synergy
Windfall
35%inclusion15 decks43 decks
22%synergy
Reanimate
30%inclusion13 decks43 decks
14%synergy
Replenish
21%inclusion9 decks43 decks
19%synergy
Toxic Deluge
19%inclusion8 decks43 decks
-1%synergy
Dance of the Manse
19%inclusion8 decks43 decks
15%synergy
Damn
16%inclusion7 decks43 decks
-4%synergy
Glimpse the Unthinkable
14%inclusion6 decks43 decks
13%synergy
Singularity Rupture
13%inclusion3 decks23 decks
11%synergy
Space-Time Anomaly
13%inclusion3 decks23 decks
11%synergy
Resurgent Belief
12%inclusion5 decks43 decks
10%synergy
Idyllic Tutor
12%inclusion5 decks43 decks
7%synergy
Extinguish All Hope
12%inclusion5 decks43 decks
10%synergy
Traumatize
12%inclusion5 decks43 decks
11%synergy
Cut Your Losses
9.3%inclusion4 decks43 decks
9%synergy
Breach the Multiverse
9.3%inclusion4 decks43 decks
7%synergy
Supreme Verdict
7.0%inclusion3 decks43 decks
-8%synergy
Open the Vaults
7.0%inclusion3 decks43 decks
6%synergy
Dread Return
7.0%inclusion3 decks43 decks
4%synergy
Brilliant Restoration
7.0%inclusion3 decks43 decks
5%synergy
Diresight
7.0%inclusion3 decks43 decks
6%synergy
Approach of the Second Sun
7.0%inclusion3 decks43 decks
3%synergy
Stock Up
5.4%inclusion2 decks37 decks
3%synergy
Utility Artifacts
Mesmeric Orb
26%inclusion11 decks43 decks
24%synergy
Cloud Key
16%inclusion7 decks43 decks
13%synergy
Lightning Greaves
14%inclusion6 decks43 decks
-9%synergy
Whip of Erebos
9.3%inclusion4 decks43 decks
7%synergy
Riverchurn Monument
5.4%inclusion2 decks37 decks
5%synergy
Enchantments
Cemetery Tampering
44%inclusion19 decks43 decks
43%synergy
Seal of Cleansing
44%inclusion19 decks43 decks
43%synergy
Propaganda
44%inclusion19 decks43 decks
15%synergy
Mystic Remora
42%inclusion18 decks43 decks
21%synergy
Secret Arcade // Dusty Parlor
42%inclusion18 decks43 decks
37%synergy
Sphere of Safety
40%inclusion17 decks43 decks
30%synergy
Ghostly Prison
40%inclusion17 decks43 decks
17%synergy
Estrid's Invocation
37%inclusion16 decks43 decks
33%synergy
Dance of the Dead
35%inclusion15 decks43 decks
33%synergy
Darksteel Mutation
33%inclusion14 decks43 decks
27%synergy
Sigil of the Empty Throne
33%inclusion14 decks43 decks
27%synergy
Amphibian Downpour
33%inclusion14 decks43 decks
28%synergy
Hallowed Haunting
33%inclusion14 decks43 decks
30%synergy
Black Market Connections
33%inclusion14 decks43 decks
18%synergy
Greater Auramancy
33%inclusion14 decks43 decks
28%synergy
Stillness in Motion
32%inclusion10 decks31 decks
32%synergy
Out of the Tombs
30%inclusion13 decks43 decks
30%synergy
Sheltered by Ghosts
30%inclusion13 decks43 decks
28%synergy
Copy Enchantment
28%inclusion12 decks43 decks
23%synergy
Polluted Cistern // Dim Oubliette
28%inclusion12 decks43 decks
27%synergy
Monologue Tax
28%inclusion12 decks43 decks
21%synergy
Teval's Judgment
26%inclusion8 decks31 decks
25%synergy
The Meathook Massacre
26%inclusion11 decks43 decks
22%synergy
Blind Obedience
26%inclusion11 decks43 decks
14%synergy
Mirror Room // Fractured Realm
26%inclusion11 decks43 decks
23%synergy
Imprisoned in the Moon
21%inclusion9 decks43 decks
14%synergy
Shark Typhoon
21%inclusion9 decks43 decks
15%synergy
Secrets of the Dead
19%inclusion8 decks43 decks
18%synergy
Central Elevator // Promising Stairs
16%inclusion7 decks43 decks
16%synergy
Restricted Office // Lecture Hall
16%inclusion7 decks43 decks
14%synergy
Aura of Silence
16%inclusion7 decks43 decks
13%synergy
Defiled Crypt // Cadaver Lab
16%inclusion7 decks43 decks
16%synergy
Solitary Confinement
16%inclusion7 decks43 decks
14%synergy
Cramped Vents // Access Maze
14%inclusion6 decks43 decks
12%synergy
Extravagant Replication
14%inclusion6 decks43 decks
9%synergy
The Tale of Tamiyo
14%inclusion6 decks43 decks
14%synergy
Touch the Spirit Realm
14%inclusion6 decks43 decks
12%synergy
Funeral Room // Awakening Hall
14%inclusion6 decks43 decks
13%synergy
Phyrexian Arena
14%inclusion6 decks43 decks
0%synergy
Trouble in Pairs
14%inclusion6 decks43 decks
9%synergy
Seal of Removal
14%inclusion6 decks43 decks
13%synergy
Underwater Tunnel // Slimy Aquarium
12%inclusion5 decks43 decks
11%synergy
Glasswing Grace
12%inclusion5 decks43 decks
9%synergy
The Eldest Reborn
12%inclusion5 decks43 decks
9%synergy
Leyline of Anticipation
12%inclusion5 decks43 decks
7%synergy
All That Glitters
12%inclusion5 decks43 decks
3%synergy
Bottomless Pool // Locker Room
12%inclusion5 decks43 decks
10%synergy
Nowhere to Run
12%inclusion5 decks43 decks
10%synergy
Static Prison
12%inclusion5 decks43 decks
11%synergy
Oubliette
12%inclusion5 decks43 decks
10%synergy
Battles
Invasion of Theros
9.3%inclusion4 decks43 decks
8%synergy
Planeswalkers
Jace, the Perfected Mind
7.0%inclusion3 decks43 decks
7%synergy
Jace, Wielder of Mysteries
7.0%inclusion3 decks43 decks
5%synergy
Utility Lands
Otawara, Soaring City
44%inclusion19 decks43 decks
25%synergy
Bojuka Bog
42%inclusion18 decks43 decks
15%synergy
Takenuma, Abandoned Mire
35%inclusion15 decks43 decks
29%synergy
Urborg, Tomb of Yawgmoth
16%inclusion7 decks43 decks
3%synergy
Reliquary Tower
14%inclusion6 decks43 decks
-20%synergy
Cephalid Coliseum
14%inclusion6 decks43 decks
10%synergy
Adagia, Windswept Bastion
13%inclusion3 decks23 decks
11%synergy
Urza's Saga
9.3%inclusion4 decks43 decks
-2%synergy
Ghost Quarter
7.0%inclusion3 decks43 decks
6%synergy
Halimar Depths
7.0%inclusion3 decks43 decks
2%synergy
Nephalia Drownyard
7.0%inclusion3 decks43 decks
7%synergy
Drownyard Temple
7.0%inclusion3 decks43 decks
7%synergy
Rogue's Passage
7.0%inclusion3 decks43 decks
-3%synergy
Mana Artifacts
Arcane Signet
70%inclusion30 decks43 decks
-18%synergy
Sol Ring
65%inclusion28 decks43 decks
-25%synergy
Talisman of Dominance
44%inclusion19 decks43 decks
-6%synergy
Talisman of Hierarchy
40%inclusion17 decks43 decks
-5%synergy
Talisman of Progress
37%inclusion16 decks43 decks
-7%synergy
Fellwar Stone
26%inclusion11 decks43 decks
-8%synergy
Orzhov Signet
21%inclusion9 decks43 decks
-11%synergy
Azorius Signet
19%inclusion8 decks43 decks
-11%synergy
Dimir Signet
16%inclusion7 decks43 decks
-14%synergy
Lotus Petal
7.0%inclusion3 decks43 decks
-3%synergy
Mind Stone
7.0%inclusion3 decks43 decks
-5%synergy
Lands
Command Tower
95%inclusion41 decks43 decks
3%synergy
Island
95%inclusion41 decks43 decks
2%synergy
Plains
95%inclusion41 decks43 decks
3%synergy
Swamp
88%inclusion38 decks43 decks
-3%synergy
Hallowed Fountain
86%inclusion37 decks43 decks
35%synergy
Polluted Delta
86%inclusion37 decks43 decks
48%synergy
Watery Grave
86%inclusion37 decks43 decks
35%synergy
Flooded Strand
84%inclusion36 decks43 decks
45%synergy
Godless Shrine
81%inclusion35 decks43 decks
30%synergy
Marsh Flats
81%inclusion35 decks43 decks
45%synergy
Shadowy Backstreet
70%inclusion30 decks43 decks
57%synergy
Morphic Pool
70%inclusion30 decks43 decks
36%synergy
Undercity Sewers
67%inclusion29 decks43 decks
53%synergy
Raffine's Tower
67%inclusion29 decks43 decks
27%synergy
Meticulous Archive
67%inclusion29 decks43 decks
53%synergy
Sea of Clouds
65%inclusion28 decks43 decks
30%synergy
Vault of Champions
65%inclusion28 decks43 decks
33%synergy
Adarkar Wastes
51%inclusion22 decks43 decks
19%synergy
Exotic Orchard
44%inclusion19 decks43 decks
-15%synergy
Caves of Koilos
44%inclusion19 decks43 decks
9%synergy
Underground River
44%inclusion19 decks43 decks
10%synergy
Drowned Catacomb
44%inclusion19 decks43 decks
6%synergy
Isolated Chapel
42%inclusion18 decks43 decks
0%synergy
Glacial Fortress
40%inclusion17 decks43 decks
-3%synergy
Arcane Sanctum
37%inclusion16 decks43 decks
-17%synergy
Gloomlake Verge
35%inclusion15 decks43 decks
24%synergy
Shipwreck Marsh
33%inclusion14 decks43 decks
12%synergy
Scrubland
33%inclusion14 decks43 decks
17%synergy
Tundra
30%inclusion13 decks43 decks
14%synergy
Underground Sea
30%inclusion13 decks43 decks
15%synergy
Valgavoth's Lair
30%inclusion13 decks43 decks
28%synergy
Floodfarm Verge
30%inclusion13 decks43 decks
19%synergy
Bleachbone Verge
30%inclusion11 decks37 decks
21%synergy
Deserted Beach
28%inclusion12 decks43 decks
7%synergy
Misty Rainforest
23%inclusion10 decks43 decks
13%synergy
Bloodstained Mire
23%inclusion10 decks43 decks
13%synergy
Verdant Catacombs
21%inclusion9 decks43 decks
11%synergy
Sunken Hollow
21%inclusion9 decks43 decks
-19%synergy
Fell the Profane
19%inclusion8 decks43 decks
10%synergy
Windswept Heath
19%inclusion8 decks43 decks
9%synergy
Scalding Tarn
19%inclusion8 decks43 decks
8%synergy
Arid Mesa
19%inclusion8 decks43 decks
9%synergy
Shattered Sanctum
19%inclusion8 decks43 decks
2%synergy
Azorius Chancery
16%inclusion7 decks43 decks
3%synergy
Dimir Aqueduct
16%inclusion7 decks43 decks
3%synergy
Prairie Stream
16%inclusion7 decks43 decks
-24%synergy
Witch Enchanter
14%inclusion6 decks43 decks
7%synergy
Fabled Passage
14%inclusion6 decks43 decks
6%synergy
Sink into Stupor
14%inclusion6 decks43 decks
1%synergy
Orzhov Basilica
14%inclusion6 decks43 decks
-1%synergy
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