The Master of Keys (Commander) - Core

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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
Utility Lands
Mana Artifacts
Lands
Back to Top
Noggle the Mind
6.8%inclusion4 decks59 decks
6%synergy
Grave Venerations
1.6%inclusion1 decks61 decks
1%synergy
Mornsong Aria
1.6%inclusion1 decks62 decks
1%synergy
Sygg, Wanderwine Wisdom
0.9%inclusion1 decks106 decks
0%synergy
Emptiness
0.9%inclusion1 decks106 decks
1%synergy
High Synergy Cards
Inquisitive Glimmer
76%inclusion309 decks404 decks
69%synergy
Mesa Enchantress
76%inclusion308 decks404 decks
67%synergy
Starfield Mystic
70%inclusion281 decks404 decks
63%synergy
Entity Tracker
65%inclusion263 decks404 decks
59%synergy
Demon of Fate's Design
62%inclusion252 decks404 decks
57%synergy
Doomwake Giant
61%inclusion248 decks404 decks
55%synergy
Fear of Sleep Paralysis
57%inclusion230 decks404 decks
52%synergy
Ripples of Undeath
53%inclusion216 decks404 decks
51%synergy
Gravebreaker Lamia
50%inclusion204 decks404 decks
50%synergy
Scrabbling Skullcrab
50%inclusion204 decks404 decks
49%synergy
Top Cards
Secret Arcade // Dusty Parlor
52%inclusion210 decks404 decks
47%synergy
Sigil of the Empty Throne
51%inclusion208 decks404 decks
46%synergy
Ondu Spiritdancer
50%inclusion202 decks404 decks
44%synergy
Swords to Plowshares
50%inclusion201 decks404 decks
-18%synergy
Mirrormade
49%inclusion199 decks404 decks
39%synergy
Sphere of Safety
49%inclusion196 decks404 decks
39%synergy
Victor, Valgavoth's Seneschal
46%inclusion186 decks404 decks
44%synergy
Redress Fate
45%inclusion183 decks404 decks
39%synergy
Fear of Impostors
42%inclusion168 decks404 decks
40%synergy
Grasp of Fate
41%inclusion164 decks404 decks
34%synergy
Creatures
Overlord of the Floodpits
40%inclusion160 decks404 decks
36%synergy
Soaring Lightbringer
38%inclusion155 decks404 decks
34%synergy
Ghostly Dancers
38%inclusion152 decks404 decks
35%synergy
Overlord of the Balemurk
34%inclusion138 decks404 decks
32%synergy
Moon-Blessed Cleric
32%inclusion128 decks404 decks
27%synergy
Aminatou, Veil Piercer
31%inclusion127 decks404 decks
30%synergy
Heliod, the Radiant Dawn
30%inclusion121 decks404 decks
26%synergy
Silent Hallcreeper
30%inclusion121 decks404 decks
26%synergy
Zur, Eternal Schemer
30%inclusion120 decks404 decks
26%synergy
Archon of Sun's Grace
28%inclusion115 decks404 decks
24%synergy
Enduring Curiosity
28%inclusion112 decks404 decks
20%synergy
Grim Guardian
27%inclusion111 decks404 decks
25%synergy
Athreos, Shroud-Veiled
25%inclusion102 decks404 decks
21%synergy
Archetype of Imagination
23%inclusion91 decks404 decks
18%synergy
Skullsnap Nuisance
22%inclusion90 decks404 decks
22%synergy
Zur the Enchanter
22%inclusion87 decks404 decks
16%synergy
Sage of Mysteries
21%inclusion84 decks404 decks
20%synergy
Mindwrack Harpy
20%inclusion81 decks404 decks
20%synergy
Ancient Cellarspawn
20%inclusion79 decks404 decks
16%synergy
Alseid of Life's Bounty
18%inclusion74 decks404 decks
17%synergy
Overlord of the Mistmoors
17%inclusion70 decks404 decks
15%synergy
Balemurk Leech
17%inclusion68 decks404 decks
16%synergy
Spirited Companion
15%inclusion61 decks404 decks
13%synergy
Nightmare Shepherd
15%inclusion60 decks404 decks
12%synergy
Auramancer
15%inclusion59 decks404 decks
12%synergy
Gremlin Tamer
14%inclusion55 decks404 decks
13%synergy
Fear of Infinity
13%inclusion54 decks404 decks
13%synergy
Solemn Simulacrum
13%inclusion53 decks404 decks
-1%synergy
Nashi, Searcher in the Dark
13%inclusion52 decks404 decks
12%synergy
Summon: Yojimbo
11%inclusion19 decks172 decks
10%synergy
Starnheim Courser
9.4%inclusion38 decks404 decks
6%synergy
Metamorphosis Fanatic
8.9%inclusion36 decks404 decks
4%synergy
Arvinox, the Mind Flail
8.7%inclusion35 decks404 decks
7%synergy
Millikin
8.4%inclusion34 decks404 decks
8%synergy
Creeping Peeper
8.2%inclusion33 decks404 decks
8%synergy
Fear of Surveillance
7.9%inclusion32 decks404 decks
8%synergy
Sun Titan
7.2%inclusion29 decks404 decks
-1%synergy
Appendage Amalgam
6.9%inclusion28 decks404 decks
7%synergy
Stenn, Paranoid Partisan
6.9%inclusion28 decks404 decks
5%synergy
Fear of Failed Tests
6.4%inclusion26 decks404 decks
6%synergy
Burnished Hart
6.4%inclusion26 decks404 decks
3%synergy
Witch Enchanter
6.4%inclusion26 decks404 decks
0%synergy
Enduring Innocence
6.4%inclusion26 decks404 decks
5%synergy
Summon: Primal Odin
6.4%inclusion11 decks172 decks
2%synergy
Ghostly Keybearer
6.2%inclusion25 decks404 decks
6%synergy
Stitcher's Supplier
6.2%inclusion25 decks404 decks
5%synergy
Phenomenon Investigators
6.2%inclusion25 decks404 decks
6%synergy
Fear of the Dark
5.7%inclusion23 decks404 decks
5%synergy
Deranged Assistant
5.7%inclusion23 decks404 decks
5%synergy
Ashiok's Reaper
5.4%inclusion22 decks404 decks
5%synergy
Instants
Arcane Denial
35%inclusion143 decks404 decks
15%synergy
Thirst for Meaning
30%inclusion121 decks404 decks
28%synergy
Path to Exile
27%inclusion110 decks404 decks
-15%synergy
Otherworldly Gaze
24%inclusion98 decks404 decks
22%synergy
Counterspell
24%inclusion96 decks404 decks
-18%synergy
Inkshield
21%inclusion84 decks404 decks
11%synergy
Void Rend
20%inclusion81 decks404 decks
-14%synergy
An Offer You Can't Refuse
17%inclusion68 decks404 decks
-10%synergy
Frantic Search
16%inclusion64 decks404 decks
-2%synergy
Utter End
15%inclusion61 decks404 decks
8%synergy
Negate
15%inclusion60 decks404 decks
-2%synergy
Brainstorm
13%inclusion51 decks404 decks
-4%synergy
Dark Ritual
10%inclusion40 decks404 decks
-10%synergy
Return to Dust
9.4%inclusion38 decks404 decks
6%synergy
Dovin's Veto
9.2%inclusion37 decks404 decks
-16%synergy
Generous Gift
7.4%inclusion30 decks404 decks
-7%synergy
Fact or Fiction
7.2%inclusion29 decks404 decks
3%synergy
Sink into Stupor
6.9%inclusion28 decks404 decks
-6%synergy
Fell the Profane
6.9%inclusion28 decks404 decks
-2%synergy
Entomb
6.7%inclusion27 decks404 decks
0%synergy
Swan Song
5.9%inclusion24 decks404 decks
-14%synergy
Unwanted Remake
5.9%inclusion24 decks404 decks
5%synergy
Anguished Unmaking
5.7%inclusion23 decks404 decks
-20%synergy
Withering Torment
5.4%inclusion22 decks404 decks
4%synergy
Telling Time
5.2%inclusion21 decks404 decks
3%synergy
Sorceries
Sevinne's Reclamation
31%inclusion127 decks404 decks
23%synergy
Time Wipe
26%inclusion104 decks404 decks
19%synergy
Extinguish All Hope
25%inclusion100 decks404 decks
23%synergy
Dance of the Manse
24%inclusion95 decks404 decks
20%synergy
Singularity Rupture
16%inclusion23 decks141 decks
14%synergy
Windfall
16%inclusion65 decks404 decks
3%synergy
Damn
12%inclusion50 decks404 decks
-8%synergy
Resurgent Belief
12%inclusion49 decks404 decks
10%synergy
Glimpse the Unthinkable
11%inclusion44 decks404 decks
10%synergy
Terminus
10%inclusion42 decks404 decks
6%synergy
Reanimate
10%inclusion42 decks404 decks
-6%synergy
Space-Time Anomaly
10%inclusion14 decks139 decks
8%synergy
Ponder
10%inclusion39 decks404 decks
1%synergy
Read the Bones
7.9%inclusion32 decks404 decks
4%synergy
Brilliant Restoration
7.9%inclusion32 decks404 decks
6%synergy
Toxic Deluge
7.2%inclusion29 decks404 decks
-12%synergy
Commune with Evil
5.7%inclusion23 decks404 decks
6%synergy
Austere Command
5.7%inclusion23 decks404 decks
-3%synergy
Diabolic Vision
5.7%inclusion23 decks404 decks
3%synergy
Idyllic Tutor
5.4%inclusion22 decks404 decks
1%synergy
Open the Vaults
5.4%inclusion22 decks404 decks
4%synergy
Portent
5.4%inclusion22 decks404 decks
2%synergy
Utility Artifacts
Cloud Key
12%inclusion49 decks404 decks
9%synergy
Keys to the House
9.4%inclusion38 decks403 decks
9%synergy
Wayfarer's Bauble
8.7%inclusion35 decks404 decks
1%synergy
Lightning Greaves
8.4%inclusion34 decks404 decks
-14%synergy
Mesmeric Orb
7.4%inclusion30 decks404 decks
6%synergy
Perpetual Timepiece
5.4%inclusion22 decks404 decks
5%synergy
Swiftfoot Boots
5.4%inclusion22 decks404 decks
-19%synergy
Whip of Erebos
5.2%inclusion21 decks404 decks
3%synergy
Enchantments
Animate Dead
40%inclusion163 decks404 decks
31%synergy
Dress Down
40%inclusion163 decks404 decks
38%synergy
Seal of Cleansing
40%inclusion162 decks404 decks
39%synergy
Defiled Crypt // Cadaver Lab
38%inclusion155 decks403 decks
38%synergy
Cemetery Tampering
38%inclusion153 decks404 decks
37%synergy
Monologue Tax
38%inclusion153 decks404 decks
32%synergy
Cacophony Unleashed
34%inclusion139 decks404 decks
33%synergy
Propaganda
33%inclusion135 decks404 decks
6%synergy
Shark Typhoon
32%inclusion131 decks404 decks
27%synergy
Bottomless Pool // Locker Room
31%inclusion127 decks404 decks
29%synergy
Timely Ward
31%inclusion124 decks404 decks
26%synergy
Estrid's Invocation
30%inclusion122 decks404 decks
26%synergy
Amphibian Downpour
30%inclusion122 decks404 decks
26%synergy
Ethereal Armor
29%inclusion118 decks404 decks
25%synergy
Extravagant Replication
28%inclusion113 decks404 decks
23%synergy
Polluted Cistern // Dim Oubliette
27%inclusion111 decks404 decks
27%synergy
All That Glitters
27%inclusion109 decks404 decks
18%synergy
Ghostly Prison
26%inclusion106 decks404 decks
4%synergy
Cramped Vents // Access Maze
26%inclusion105 decks404 decks
24%synergy
Stillness in Motion
26%inclusion51 decks200 decks
25%synergy
The Eldest Reborn
25%inclusion103 decks404 decks
23%synergy
Mystic Remora
25%inclusion102 decks404 decks
4%synergy
Necromancy
25%inclusion100 decks404 decks
20%synergy
The Tale of Tamiyo
24%inclusion96 decks404 decks
23%synergy
Darksteel Mutation
23%inclusion91 decks404 decks
16%synergy
Restricted Office // Lecture Hall
23%inclusion91 decks404 decks
20%synergy
Mirror Room // Fractured Realm
23%inclusion91 decks404 decks
20%synergy
Starfield of Nyx
22%inclusion88 decks404 decks
18%synergy
Central Elevator // Promising Stairs
20%inclusion80 decks404 decks
19%synergy
Imprisoned in the Moon
19%inclusion78 decks404 decks
13%synergy
Sheltered by Ghosts
19%inclusion76 decks404 decks
16%synergy
Seal of Removal
18%inclusion74 decks404 decks
18%synergy
Derelict Attic // Widow's Walk
18%inclusion73 decks402 decks
18%synergy
Blind Obedience
18%inclusion73 decks404 decks
6%synergy
Hallowed Haunting
18%inclusion73 decks404 decks
16%synergy
Dazzling Theater // Prop Room
18%inclusion72 decks403 decks
16%synergy
Secrets of the Dead
18%inclusion72 decks404 decks
18%synergy
Phyrexian Arena
18%inclusion71 decks404 decks
4%synergy
Meat Locker // Drowned Diner
17%inclusion70 decks402 decks
17%synergy
One with the Multiverse
17%inclusion70 decks404 decks
13%synergy
Cast Out
17%inclusion67 decks404 decks
14%synergy
Underwater Tunnel // Slimy Aquarium
15%inclusion61 decks403 decks
15%synergy
Unable to Scream
15%inclusion60 decks404 decks
14%synergy
Copy Enchantment
15%inclusion59 decks404 decks
10%synergy
Spirit-Sister's Call
14%inclusion57 decks404 decks
13%synergy
Surgical Suite // Hospital Room
14%inclusion56 decks404 decks
13%synergy
Funeral Room // Awakening Hall
14%inclusion56 decks404 decks
13%synergy
Nowhere to Run
14%inclusion55 decks404 decks
12%synergy
Court of Cunning
13%inclusion53 decks404 decks
12%synergy
Teval's Judgment
12%inclusion25 decks203 decks
12%synergy
Battles
Invasion of Theros
11%inclusion43 decks404 decks
9%synergy
Utility Lands
Hall of Heliod's Generosity
59%inclusion240 decks404 decks
46%synergy
Bojuka Bog
48%inclusion195 decks404 decks
21%synergy
Halimar Depths
20%inclusion81 decks404 decks
15%synergy
Reliquary Tower
10%inclusion41 decks404 decks
-24%synergy
Cephalid Coliseum
8.7%inclusion35 decks404 decks
5%synergy
Takenuma, Abandoned Mire
6.2%inclusion25 decks404 decks
0%synergy
Nephalia Drownyard
5.9%inclusion24 decks404 decks
5%synergy
Otawara, Soaring City
5.7%inclusion23 decks404 decks
-13%synergy
Mana Artifacts
Arcane Signet
88%inclusion354 decks404 decks
0%synergy
Sol Ring
80%inclusion325 decks404 decks
-9%synergy
Azorius Signet
54%inclusion218 decks404 decks
23%synergy
Orzhov Signet
50%inclusion204 decks404 decks
17%synergy
Talisman of Dominance
41%inclusion166 decks404 decks
-8%synergy
Talisman of Progress
39%inclusion158 decks404 decks
-4%synergy
Talisman of Hierarchy
35%inclusion141 decks404 decks
-9%synergy
Dimir Signet
34%inclusion137 decks404 decks
2%synergy
Fellwar Stone
25%inclusion99 decks404 decks
-9%synergy
Commander's Sphere
25%inclusion99 decks404 decks
6%synergy
Mind Stone
24%inclusion97 decks404 decks
11%synergy
Chromatic Lantern
7.2%inclusion29 decks404 decks
-6%synergy
Lands
Island
99%inclusion399 decks404 decks
6%synergy
Plains
98%inclusion395 decks404 decks
6%synergy
Swamp
97%inclusion392 decks404 decks
6%synergy
Command Tower
93%inclusion376 decks404 decks
1%synergy
Arcane Sanctum
72%inclusion292 decks404 decks
18%synergy
Caves of Koilos
63%inclusion253 decks404 decks
27%synergy
Adarkar Wastes
62%inclusion251 decks404 decks
31%synergy
Underground River
54%inclusion219 decks404 decks
21%synergy
Exotic Orchard
49%inclusion199 decks404 decks
-9%synergy
Obscura Storefront
45%inclusion180 decks404 decks
35%synergy
Evolving Wilds
43%inclusion172 decks404 decks
18%synergy
Terramorphic Expanse
43%inclusion172 decks404 decks
26%synergy
Temple of Enlightenment
43%inclusion172 decks404 decks
26%synergy
Temple of Silence
42%inclusion169 decks404 decks
23%synergy
Temple of Deceit
41%inclusion164 decks404 decks
23%synergy
Dimir Aqueduct
38%inclusion153 decks404 decks
24%synergy
Azorius Chancery
38%inclusion152 decks404 decks
24%synergy
Prairie Stream
37%inclusion151 decks404 decks
-3%synergy
Glacial Fortress
37%inclusion149 decks404 decks
-4%synergy
Tainted Field
36%inclusion145 decks404 decks
29%synergy
Contaminated Landscape
35%inclusion140 decks404 decks
21%synergy
Isolated Chapel
34%inclusion138 decks404 decks
-6%synergy
Orzhov Basilica
34%inclusion138 decks404 decks
19%synergy
Tainted Isle
33%inclusion135 decks404 decks
27%synergy
Sunken Hollow
33%inclusion133 decks404 decks
-7%synergy
Drowned Catacomb
32%inclusion128 decks404 decks
-5%synergy
Valgavoth's Lair
31%inclusion124 decks404 decks
28%synergy
Ash Barrens
26%inclusion107 decks404 decks
16%synergy
Godless Shrine
25%inclusion103 decks404 decks
-25%synergy
Raffine's Tower
25%inclusion101 decks404 decks
-16%synergy
Watery Grave
25%inclusion99 decks404 decks
-26%synergy
Hallowed Fountain
24%inclusion97 decks404 decks
-26%synergy
Flooded Strand
19%inclusion75 decks404 decks
-20%synergy
Sea of Clouds
18%inclusion74 decks404 decks
-17%synergy
Shadowy Backstreet
18%inclusion73 decks404 decks
6%synergy
Meticulous Archive
18%inclusion73 decks404 decks
4%synergy
Undercity Sewers
18%inclusion71 decks404 decks
3%synergy
Polluted Delta
18%inclusion71 decks404 decks
-20%synergy
Vault of Champions
17%inclusion69 decks404 decks
-16%synergy
Floodfarm Verge
17%inclusion68 decks404 decks
6%synergy
Gloomlake Verge
16%inclusion65 decks404 decks
5%synergy
Marsh Flats
16%inclusion65 decks404 decks
-20%synergy
Shipwreck Marsh
15%inclusion62 decks404 decks
-5%synergy
Deserted Beach
15%inclusion60 decks404 decks
-6%synergy
Thriving Isle
15%inclusion59 decks404 decks
10%synergy
Thriving Moor
15%inclusion59 decks404 decks
10%synergy
Morphic Pool
15%inclusion59 decks404 decks
-19%synergy
Skycloud Expanse
15%inclusion59 decks404 decks
0%synergy
Thriving Heath
14%inclusion58 decks404 decks
10%synergy
Darkwater Catacombs
14%inclusion55 decks404 decks
-1%synergy
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