The Master of Keys (Commander) - 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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Instants
Sorceries
Utility Artifacts
Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
Back to Top
Noggle the Mind
6.3%inclusion2 decks32 decks
6%synergy
Grave Venerations
2.9%inclusion1 decks34 decks
3%synergy
High Synergy Cards
Inquisitive Glimmer
76%inclusion294 decks385 decks
69%synergy
Mesa Enchantress
76%inclusion294 decks385 decks
67%synergy
Starfield Mystic
71%inclusion272 decks385 decks
64%synergy
Entity Tracker
66%inclusion254 decks385 decks
60%synergy
Demon of Fate's Design
63%inclusion243 decks385 decks
58%synergy
Doomwake Giant
62%inclusion240 decks385 decks
56%synergy
Fear of Sleep Paralysis
57%inclusion221 decks385 decks
52%synergy
Ripples of Undeath
54%inclusion207 decks385 decks
51%synergy
Gravebreaker Lamia
51%inclusion195 decks385 decks
50%synergy
Scrabbling Skullcrab
51%inclusion195 decks385 decks
50%synergy
Top Cards
Secret Arcade // Dusty Parlor
53%inclusion203 decks385 decks
48%synergy
Sigil of the Empty Throne
52%inclusion199 decks385 decks
46%synergy
Ondu Spiritdancer
52%inclusion199 decks385 decks
45%synergy
Swords to Plowshares
51%inclusion196 decks385 decks
-17%synergy
Mirrormade
50%inclusion194 decks385 decks
41%synergy
Sphere of Safety
49%inclusion190 decks385 decks
40%synergy
Redress Fate
46%inclusion178 decks385 decks
40%synergy
Victor, Valgavoth's Seneschal
45%inclusion173 decks385 decks
43%synergy
Fear of Impostors
42%inclusion161 decks385 decks
40%synergy
Dress Down
42%inclusion160 decks385 decks
39%synergy
Creatures
Soaring Lightbringer
39%inclusion151 decks385 decks
34%synergy
Overlord of the Floodpits
38%inclusion148 decks385 decks
35%synergy
Ghostly Dancers
37%inclusion143 decks385 decks
35%synergy
Overlord of the Balemurk
34%inclusion130 decks385 decks
32%synergy
Moon-Blessed Cleric
31%inclusion120 decks385 decks
26%synergy
Aminatou, Veil Piercer
31%inclusion120 decks385 decks
30%synergy
Heliod, the Radiant Dawn
30%inclusion115 decks385 decks
26%synergy
Zur, Eternal Schemer
29%inclusion112 decks385 decks
26%synergy
Silent Hallcreeper
29%inclusion111 decks385 decks
25%synergy
Archon of Sun's Grace
29%inclusion110 decks385 decks
24%synergy
Enduring Curiosity
28%inclusion107 decks385 decks
20%synergy
Grim Guardian
26%inclusion102 decks385 decks
24%synergy
Athreos, Shroud-Veiled
26%inclusion99 decks385 decks
21%synergy
Archetype of Imagination
22%inclusion85 decks385 decks
17%synergy
Skullsnap Nuisance
22%inclusion84 decks385 decks
21%synergy
Zur the Enchanter
21%inclusion80 decks385 decks
16%synergy
Mindwrack Harpy
21%inclusion79 decks385 decks
20%synergy
Sage of Mysteries
20%inclusion78 decks385 decks
20%synergy
Ancient Cellarspawn
19%inclusion74 decks385 decks
16%synergy
Alseid of Life's Bounty
18%inclusion69 decks385 decks
16%synergy
Overlord of the Mistmoors
16%inclusion63 decks385 decks
14%synergy
Balemurk Leech
16%inclusion63 decks385 decks
16%synergy
Nightmare Shepherd
15%inclusion59 decks385 decks
13%synergy
Spirited Companion
15%inclusion57 decks385 decks
13%synergy
Auramancer
15%inclusion56 decks385 decks
12%synergy
Gremlin Tamer
14%inclusion52 decks385 decks
12%synergy
Solemn Simulacrum
13%inclusion51 decks385 decks
-1%synergy
Fear of Infinity
13%inclusion51 decks385 decks
13%synergy
Nashi, Searcher in the Dark
13%inclusion49 decks385 decks
12%synergy
Summon: Yojimbo
12%inclusion18 decks152 decks
11%synergy
Starnheim Courser
10%inclusion37 decks385 decks
6%synergy
Metamorphosis Fanatic
9.4%inclusion36 decks385 decks
5%synergy
Arvinox, the Mind Flail
8.8%inclusion34 decks385 decks
7%synergy
Creeping Peeper
8.3%inclusion32 decks385 decks
8%synergy
Millikin
8.1%inclusion31 decks385 decks
7%synergy
Sun Titan
7.5%inclusion29 decks385 decks
-1%synergy
Stenn, Paranoid Partisan
6.8%inclusion26 decks385 decks
5%synergy
Fear of Surveillance
6.8%inclusion26 decks385 decks
6%synergy
Burnished Hart
6.5%inclusion25 decks385 decks
3%synergy
Witch Enchanter
6.2%inclusion24 decks385 decks
-1%synergy
Enduring Innocence
6.2%inclusion24 decks385 decks
5%synergy
Phenomenon Investigators
6.2%inclusion24 decks385 decks
6%synergy
Stitcher's Supplier
6.0%inclusion23 decks385 decks
5%synergy
Appendage Amalgam
6.0%inclusion23 decks385 decks
6%synergy
Summon: Primal Odin
5.9%inclusion9 decks152 decks
2%synergy
Braids, Arisen Nightmare
5.7%inclusion22 decks385 decks
5%synergy
Ashiok's Reaper
5.5%inclusion21 decks385 decks
5%synergy
Fear of the Dark
5.5%inclusion21 decks385 decks
5%synergy
Enduring Tenacity
5.5%inclusion21 decks385 decks
-2%synergy
Deranged Assistant
5.5%inclusion21 decks385 decks
5%synergy
Instants
Arcane Denial
36%inclusion139 decks385 decks
16%synergy
Thirst for Meaning
30%inclusion117 decks385 decks
29%synergy
Path to Exile
28%inclusion106 decks385 decks
-15%synergy
Counterspell
24%inclusion91 decks385 decks
-18%synergy
Otherworldly Gaze
24%inclusion91 decks385 decks
21%synergy
Inkshield
22%inclusion83 decks385 decks
12%synergy
Void Rend
19%inclusion75 decks385 decks
-15%synergy
An Offer You Can't Refuse
17%inclusion67 decks385 decks
-9%synergy
Frantic Search
16%inclusion62 decks385 decks
-1%synergy
Negate
15%inclusion57 decks385 decks
-2%synergy
Utter End
15%inclusion57 decks385 decks
8%synergy
Brainstorm
13%inclusion50 decks385 decks
-4%synergy
Dark Ritual
10%inclusion39 decks385 decks
-9%synergy
Return to Dust
10%inclusion38 decks385 decks
6%synergy
Dovin's Veto
9.4%inclusion36 decks385 decks
-16%synergy
Generous Gift
7.8%inclusion30 decks385 decks
-7%synergy
Fact or Fiction
7.0%inclusion27 decks385 decks
3%synergy
Fell the Profane
6.8%inclusion26 decks385 decks
-2%synergy
Entomb
6.8%inclusion26 decks385 decks
0%synergy
Sink into Stupor
6.5%inclusion25 decks385 decks
-6%synergy
Swan Song
6.0%inclusion23 decks385 decks
-14%synergy
Anguished Unmaking
6.0%inclusion23 decks385 decks
-19%synergy
Unwanted Remake
5.7%inclusion22 decks385 decks
5%synergy
Withering Torment
5.5%inclusion21 decks385 decks
4%synergy
Telling Time
5.5%inclusion21 decks385 decks
3%synergy
Sorceries
Sevinne's Reclamation
32%inclusion122 decks385 decks
23%synergy
Time Wipe
26%inclusion101 decks385 decks
19%synergy
Extinguish All Hope
24%inclusion94 decks385 decks
23%synergy
Dance of the Manse
23%inclusion90 decks385 decks
20%synergy
Windfall
16%inclusion63 decks385 decks
3%synergy
Singularity Rupture
16%inclusion19 decks120 decks
13%synergy
Resurgent Belief
13%inclusion49 decks385 decks
11%synergy
Damn
13%inclusion49 decks385 decks
-8%synergy
Space-Time Anomaly
12%inclusion14 decks118 decks
10%synergy
Glimpse the Unthinkable
11%inclusion43 decks385 decks
11%synergy
Reanimate
11%inclusion41 decks385 decks
-5%synergy
Terminus
10%inclusion40 decks385 decks
6%synergy
Ponder
10%inclusion39 decks385 decks
1%synergy
Read the Bones
8.6%inclusion33 decks385 decks
4%synergy
Brilliant Restoration
8.3%inclusion32 decks385 decks
6%synergy
Toxic Deluge
7.3%inclusion28 decks385 decks
-12%synergy
Diabolic Vision
6.0%inclusion23 decks385 decks
4%synergy
Portent
6.0%inclusion23 decks385 decks
3%synergy
Austere Command
6.0%inclusion23 decks385 decks
-3%synergy
Commune with Evil
5.7%inclusion22 decks385 decks
6%synergy
Open the Vaults
5.5%inclusion21 decks385 decks
4%synergy
Aminatou's Augury
5.2%inclusion20 decks385 decks
4%synergy
Utility Artifacts
Cloud Key
12%inclusion47 decks385 decks
9%synergy
Keys to the House
8.9%inclusion34 decks384 decks
9%synergy
Lightning Greaves
8.8%inclusion34 decks385 decks
-14%synergy
Wayfarer's Bauble
8.8%inclusion34 decks385 decks
1%synergy
Mesmeric Orb
7.8%inclusion30 decks385 decks
7%synergy
Perpetual Timepiece
5.7%inclusion22 decks385 decks
5%synergy
Whip of Erebos
5.5%inclusion21 decks385 decks
3%synergy
Swiftfoot Boots
5.5%inclusion21 decks385 decks
-19%synergy
Enchantments
Animate Dead
41%inclusion157 decks385 decks
31%synergy
Grasp of Fate
41%inclusion157 decks385 decks
35%synergy
Seal of Cleansing
41%inclusion157 decks385 decks
39%synergy
Cemetery Tampering
38%inclusion146 decks385 decks
37%synergy
Monologue Tax
38%inclusion146 decks385 decks
32%synergy
Defiled Crypt // Cadaver Lab
38%inclusion145 decks384 decks
37%synergy
Cacophony Unleashed
35%inclusion134 decks385 decks
33%synergy
Propaganda
33%inclusion128 decks385 decks
6%synergy
Shark Typhoon
33%inclusion127 decks385 decks
27%synergy
Timely Ward
31%inclusion120 decks385 decks
26%synergy
Estrid's Invocation
31%inclusion118 decks385 decks
26%synergy
Amphibian Downpour
31%inclusion118 decks385 decks
26%synergy
Bottomless Pool // Locker Room
31%inclusion118 decks385 decks
29%synergy
Ethereal Armor
29%inclusion111 decks385 decks
24%synergy
Extravagant Replication
28%inclusion109 decks385 decks
23%synergy
Polluted Cistern // Dim Oubliette
28%inclusion106 decks385 decks
27%synergy
Ghostly Prison
27%inclusion104 decks385 decks
5%synergy
All That Glitters
27%inclusion104 decks385 decks
18%synergy
The Eldest Reborn
26%inclusion100 decks385 decks
23%synergy
Cramped Vents // Access Maze
26%inclusion100 decks385 decks
23%synergy
Mystic Remora
26%inclusion100 decks385 decks
5%synergy
Necromancy
25%inclusion98 decks385 decks
21%synergy
Stillness in Motion
25%inclusion46 decks181 decks
25%synergy
The Tale of Tamiyo
24%inclusion92 decks385 decks
23%synergy
Darksteel Mutation
23%inclusion89 decks385 decks
17%synergy
Starfield of Nyx
22%inclusion85 decks385 decks
18%synergy
Mirror Room // Fractured Realm
22%inclusion84 decks385 decks
20%synergy
Restricted Office // Lecture Hall
21%inclusion82 decks385 decks
19%synergy
Imprisoned in the Moon
19%inclusion74 decks385 decks
13%synergy
Central Elevator // Promising Stairs
19%inclusion74 decks385 decks
19%synergy
Seal of Removal
19%inclusion72 decks385 decks
18%synergy
Blind Obedience
19%inclusion72 decks385 decks
6%synergy
Sheltered by Ghosts
18%inclusion71 decks385 decks
16%synergy
Hallowed Haunting
18%inclusion70 decks385 decks
16%synergy
One with the Multiverse
18%inclusion69 decks385 decks
13%synergy
Secrets of the Dead
18%inclusion69 decks385 decks
18%synergy
Cast Out
18%inclusion68 decks385 decks
15%synergy
Derelict Attic // Widow's Walk
17%inclusion67 decks383 decks
17%synergy
Dazzling Theater // Prop Room
17%inclusion67 decks384 decks
16%synergy
Phyrexian Arena
17%inclusion67 decks385 decks
3%synergy
Meat Locker // Drowned Diner
16%inclusion63 decks383 decks
16%synergy
Underwater Tunnel // Slimy Aquarium
15%inclusion59 decks384 decks
15%synergy
Copy Enchantment
15%inclusion58 decks385 decks
10%synergy
Unable to Scream
15%inclusion58 decks385 decks
14%synergy
Spirit-Sister's Call
15%inclusion57 decks385 decks
14%synergy
Nowhere to Run
14%inclusion53 decks385 decks
13%synergy
Teval's Judgment
14%inclusion25 decks184 decks
13%synergy
Surgical Suite // Hospital Room
14%inclusion52 decks385 decks
13%synergy
Funeral Room // Awakening Hall
14%inclusion52 decks385 decks
13%synergy
Court of Cunning
13%inclusion50 decks385 decks
12%synergy
Battles
Invasion of Theros
10%inclusion39 decks385 decks
8%synergy
Utility Lands
Hall of Heliod's Generosity
60%inclusion230 decks385 decks
47%synergy
Bojuka Bog
49%inclusion189 decks385 decks
22%synergy
Halimar Depths
21%inclusion79 decks385 decks
16%synergy
Reliquary Tower
10%inclusion40 decks385 decks
-23%synergy
Cephalid Coliseum
8.3%inclusion32 decks385 decks
5%synergy
Takenuma, Abandoned Mire
6.5%inclusion25 decks385 decks
0%synergy
Nephalia Drownyard
6.0%inclusion23 decks385 decks
5%synergy
Adagia, Windswept Bastion
5.8%inclusion7 decks120 decks
3%synergy
Otawara, Soaring City
5.7%inclusion22 decks385 decks
-13%synergy
Mana Artifacts
Arcane Signet
88%inclusion340 decks385 decks
0%synergy
Sol Ring
81%inclusion313 decks385 decks
-9%synergy
Azorius Signet
55%inclusion210 decks385 decks
23%synergy
Orzhov Signet
52%inclusion200 decks385 decks
18%synergy
Talisman of Dominance
42%inclusion163 decks385 decks
-7%synergy
Talisman of Progress
40%inclusion154 decks385 decks
-3%synergy
Talisman of Hierarchy
36%inclusion138 decks385 decks
-8%synergy
Dimir Signet
35%inclusion134 decks385 decks
3%synergy
Commander's Sphere
25%inclusion95 decks385 decks
6%synergy
Fellwar Stone
25%inclusion95 decks385 decks
-9%synergy
Mind Stone
25%inclusion95 decks385 decks
12%synergy
Chromatic Lantern
7.3%inclusion28 decks385 decks
-6%synergy
Lands
Island
99%inclusion380 decks385 decks
6%synergy
Plains
98%inclusion376 decks385 decks
6%synergy
Swamp
97%inclusion373 decks385 decks
6%synergy
Command Tower
94%inclusion360 decks385 decks
1%synergy
Arcane Sanctum
73%inclusion281 decks385 decks
18%synergy
Caves of Koilos
63%inclusion244 decks385 decks
28%synergy
Adarkar Wastes
63%inclusion243 decks385 decks
32%synergy
Underground River
55%inclusion212 decks385 decks
22%synergy
Exotic Orchard
49%inclusion188 decks385 decks
-10%synergy
Obscura Storefront
45%inclusion175 decks385 decks
35%synergy
Terramorphic Expanse
44%inclusion168 decks385 decks
27%synergy
Evolving Wilds
43%inclusion167 decks385 decks
18%synergy
Temple of Enlightenment
43%inclusion166 decks385 decks
27%synergy
Temple of Silence
42%inclusion162 decks385 decks
23%synergy
Temple of Deceit
41%inclusion158 decks385 decks
23%synergy
Azorius Chancery
39%inclusion150 decks385 decks
25%synergy
Dimir Aqueduct
39%inclusion150 decks385 decks
25%synergy
Prairie Stream
38%inclusion146 decks385 decks
-3%synergy
Glacial Fortress
37%inclusion142 decks385 decks
-4%synergy
Tainted Field
36%inclusion139 decks385 decks
29%synergy
Orzhov Basilica
35%inclusion135 decks385 decks
19%synergy
Contaminated Landscape
35%inclusion133 decks385 decks
20%synergy
Isolated Chapel
35%inclusion133 decks385 decks
-5%synergy
Tainted Isle
34%inclusion130 decks385 decks
27%synergy
Sunken Hollow
33%inclusion127 decks385 decks
-7%synergy
Drowned Catacomb
32%inclusion123 decks385 decks
-4%synergy
Valgavoth's Lair
31%inclusion120 decks385 decks
28%synergy
Ash Barrens
28%inclusion106 decks385 decks
17%synergy
Raffine's Tower
25%inclusion96 decks385 decks
-16%synergy
Godless Shrine
25%inclusion96 decks385 decks
-26%synergy
Watery Grave
24%inclusion92 decks385 decks
-26%synergy
Hallowed Fountain
23%inclusion88 decks385 decks
-27%synergy
Flooded Strand
19%inclusion73 decks385 decks
-19%synergy
Sea of Clouds
19%inclusion72 decks385 decks
-17%synergy
Shadowy Backstreet
18%inclusion70 decks385 decks
6%synergy
Meticulous Archive
18%inclusion69 decks385 decks
4%synergy
Undercity Sewers
18%inclusion69 decks385 decks
4%synergy
Polluted Delta
18%inclusion68 decks385 decks
-20%synergy
Vault of Champions
17%inclusion66 decks385 decks
-16%synergy
Floodfarm Verge
17%inclusion66 decks385 decks
6%synergy
Marsh Flats
17%inclusion64 decks385 decks
-20%synergy
Gloomlake Verge
16%inclusion63 decks385 decks
5%synergy
Shipwreck Marsh
16%inclusion60 decks385 decks
-5%synergy
Thriving Isle
15%inclusion59 decks385 decks
11%synergy
Thriving Moor
15%inclusion58 decks385 decks
11%synergy
Deserted Beach
15%inclusion57 decks385 decks
-6%synergy
Thriving Heath
15%inclusion57 decks385 decks
10%synergy
Skycloud Expanse
15%inclusion56 decks385 decks
0%synergy
Morphic Pool
15%inclusion56 decks385 decks
-20%synergy
Darkwater Catacombs
14%inclusion52 decks385 decks
-1%synergy
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