The Master of Keys (Commander) - Core

The Master of Keys
Rank #300
426decks
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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
Utility Lands
Mana Artifacts
Lands
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Primary Research
10%inclusion3 decks29 decks
10%synergy
Emeritus of Truce
4.5%inclusion1 decks22 decks
4%synergy
Umbral Expanse
3.4%inclusion1 decks29 decks
3%synergy
Coercive Impetus
3.4%inclusion1 decks29 decks
3%synergy
Emeritus of Ideation
3.4%inclusion1 decks29 decks
2%synergy
High Synergy Cards
Inquisitive Glimmer
77%inclusion328 decks426 decks
70%synergy
Mesa Enchantress
74%inclusion316 decks426 decks
65%synergy
Starfield Mystic
69%inclusion293 decks426 decks
62%synergy
Entity Tracker
65%inclusion276 decks426 decks
59%synergy
Demon of Fate's Design
62%inclusion264 decks426 decks
57%synergy
Doomwake Giant
60%inclusion255 decks426 decks
54%synergy
Gravebreaker Lamia
52%inclusion221 decks426 decks
51%synergy
Ripples of Undeath
54%inclusion228 decks426 decks
51%synergy
Fear of Sleep Paralysis
55%inclusion235 decks426 decks
50%synergy
Scrabbling Skullcrab
49%inclusion208 decks426 decks
48%synergy
Top Cards
Sigil of the Empty Throne
51%inclusion217 decks426 decks
45%synergy
Secret Arcade // Dusty Parlor
50%inclusion215 decks426 decks
46%synergy
Ondu Spiritdancer
50%inclusion211 decks426 decks
43%synergy
Swords to Plowshares
49%inclusion209 decks426 decks
-19%synergy
Mirrormade
48%inclusion205 decks426 decks
38%synergy
Sphere of Safety
47%inclusion202 decks426 decks
38%synergy
Victor, Valgavoth's Seneschal
46%inclusion198 decks426 decks
45%synergy
Redress Fate
44%inclusion186 decks426 decks
38%synergy
Fear of Impostors
42%inclusion178 decks426 decks
40%synergy
Grasp of Fate
41%inclusion175 decks426 decks
35%synergy
Creatures
Overlord of the Floodpits
39%inclusion166 decks426 decks
35%synergy
Ghostly Dancers
37%inclusion157 decks426 decks
34%synergy
Soaring Lightbringer
37%inclusion156 decks426 decks
32%synergy
Overlord of the Balemurk
35%inclusion147 decks426 decks
33%synergy
Aminatou, Veil Piercer
31%inclusion132 decks426 decks
30%synergy
Moon-Blessed Cleric
31%inclusion131 decks426 decks
26%synergy
Zur, Eternal Schemer
31%inclusion130 decks426 decks
27%synergy
Silent Hallcreeper
30%inclusion128 decks426 decks
26%synergy
Heliod, the Radiant Dawn
29%inclusion124 decks426 decks
26%synergy
Archon of Sun's Grace
28%inclusion119 decks426 decks
23%synergy
Grim Guardian
27%inclusion116 decks426 decks
25%synergy
Enduring Curiosity
27%inclusion114 decks426 decks
19%synergy
Athreos, Shroud-Veiled
24%inclusion103 decks426 decks
20%synergy
Zur the Enchanter
23%inclusion98 decks426 decks
18%synergy
Skullsnap Nuisance
22%inclusion92 decks426 decks
21%synergy
Archetype of Imagination
21%inclusion90 decks426 decks
16%synergy
Mindwrack Harpy
21%inclusion90 decks426 decks
21%synergy
Sage of Mysteries
20%inclusion86 decks426 decks
20%synergy
Alseid of Life's Bounty
19%inclusion80 decks426 decks
17%synergy
Ancient Cellarspawn
19%inclusion79 decks426 decks
16%synergy
Overlord of the Mistmoors
17%inclusion72 decks426 decks
15%synergy
Balemurk Leech
16%inclusion68 decks426 decks
15%synergy
Spirited Companion
15%inclusion64 decks426 decks
13%synergy
Nightmare Shepherd
14%inclusion61 decks426 decks
12%synergy
Gremlin Tamer
14%inclusion59 decks426 decks
13%synergy
Auramancer
14%inclusion59 decks426 decks
11%synergy
Summon: Yojimbo
13%inclusion25 decks195 decks
12%synergy
Fear of Infinity
13%inclusion54 decks426 decks
12%synergy
Nashi, Searcher in the Dark
13%inclusion54 decks426 decks
12%synergy
Solemn Simulacrum
12%inclusion53 decks426 decks
-1%synergy
Starnheim Courser
10%inclusion44 decks426 decks
7%synergy
Millikin
9.4%inclusion40 decks426 decks
9%synergy
Metamorphosis Fanatic
8.2%inclusion35 decks426 decks
4%synergy
Arvinox, the Mind Flail
8.2%inclusion35 decks426 decks
7%synergy
Creeping Peeper
8.2%inclusion35 decks426 decks
8%synergy
Fear of Surveillance
8.0%inclusion34 decks426 decks
8%synergy
Sun Titan
7.3%inclusion31 decks426 decks
-1%synergy
Summon: Primal Odin
7.2%inclusion14 decks195 decks
3%synergy
Stenn, Paranoid Partisan
7.0%inclusion30 decks426 decks
6%synergy
Appendage Amalgam
6.8%inclusion29 decks426 decks
7%synergy
Deranged Assistant
6.8%inclusion29 decks426 decks
7%synergy
Hedron Crab
6.6%inclusion28 decks426 decks
6%synergy
Enduring Innocence
6.6%inclusion28 decks426 decks
5%synergy
Stitcher's Supplier
6.3%inclusion27 decks426 decks
6%synergy
Witch Enchanter
6.1%inclusion26 decks426 decks
-1%synergy
Burnished Hart
6.1%inclusion26 decks426 decks
3%synergy
Fear of Failed Tests
5.9%inclusion25 decks426 decks
5%synergy
Phenomenon Investigators
5.9%inclusion25 decks426 decks
5%synergy
Emet-Selch of the Third Seat
5.6%inclusion11 decks195 decks
-4%synergy
Braids, Arisen Nightmare
5.4%inclusion23 decks426 decks
4%synergy
Instants
Arcane Denial
34%inclusion144 decks426 decks
14%synergy
Thirst for Meaning
29%inclusion122 decks426 decks
27%synergy
Path to Exile
27%inclusion117 decks426 decks
-15%synergy
Counterspell
25%inclusion105 decks426 decks
-17%synergy
Otherworldly Gaze
24%inclusion103 decks426 decks
22%synergy
Void Rend
21%inclusion89 decks426 decks
-14%synergy
Inkshield
20%inclusion84 decks426 decks
10%synergy
Frantic Search
17%inclusion71 decks426 decks
-1%synergy
An Offer You Can't Refuse
16%inclusion68 decks426 decks
-11%synergy
Negate
15%inclusion62 decks426 decks
-2%synergy
Utter End
14%inclusion61 decks426 decks
8%synergy
Brainstorm
12%inclusion50 decks426 decks
-5%synergy
Dovin's Veto
10%inclusion43 decks426 decks
-16%synergy
Dark Ritual
10%inclusion42 decks426 decks
-10%synergy
Return to Dust
8.7%inclusion37 decks426 decks
5%synergy
Generous Gift
7.7%inclusion33 decks426 decks
-6%synergy
Fact or Fiction
7.3%inclusion31 decks426 decks
4%synergy
Sink into Stupor
7.0%inclusion30 decks426 decks
-6%synergy
Fell the Profane
6.8%inclusion29 decks426 decks
-2%synergy
Entomb
6.8%inclusion29 decks426 decks
0%synergy
Swan Song
6.8%inclusion29 decks426 decks
-13%synergy
Unwanted Remake
5.6%inclusion24 decks426 decks
5%synergy
Anguished Unmaking
5.6%inclusion24 decks426 decks
-20%synergy
Sorceries
Sevinne's Reclamation
31%inclusion133 decks426 decks
22%synergy
Extinguish All Hope
25%inclusion107 decks426 decks
24%synergy
Time Wipe
24%inclusion102 decks426 decks
17%synergy
Dance of the Manse
23%inclusion99 decks426 decks
20%synergy
Singularity Rupture
19%inclusion31 decks165 decks
17%synergy
Windfall
16%inclusion67 decks426 decks
3%synergy
Resurgent Belief
12%inclusion53 decks426 decks
10%synergy
Damn
12%inclusion51 decks426 decks
-8%synergy
Reanimate
11%inclusion48 decks426 decks
-5%synergy
Glimpse the Unthinkable
11%inclusion47 decks426 decks
11%synergy
Space-Time Anomaly
10%inclusion17 decks163 decks
9%synergy
Terminus
10%inclusion41 decks426 decks
6%synergy
Ponder
8.9%inclusion38 decks426 decks
0%synergy
Brilliant Restoration
8.0%inclusion34 decks426 decks
6%synergy
Read the Bones
7.5%inclusion32 decks426 decks
3%synergy
Toxic Deluge
7.0%inclusion30 decks426 decks
-13%synergy
Austere Command
5.6%inclusion24 decks426 decks
-3%synergy
Idyllic Tutor
5.6%inclusion24 decks426 decks
1%synergy
Commune with Evil
5.2%inclusion22 decks426 decks
5%synergy
Open the Vaults
5.2%inclusion22 decks426 decks
4%synergy
Diabolic Vision
5.2%inclusion22 decks426 decks
3%synergy
Portent
5.2%inclusion22 decks426 decks
2%synergy
Utility Artifacts
Cloud Key
12%inclusion51 decks426 decks
9%synergy
Wayfarer's Bauble
8.9%inclusion38 decks426 decks
1%synergy
Keys to the House
8.7%inclusion37 decks425 decks
8%synergy
Lightning Greaves
8.2%inclusion35 decks426 decks
-15%synergy
Mesmeric Orb
7.7%inclusion33 decks426 decks
7%synergy
Swiftfoot Boots
5.6%inclusion24 decks426 decks
-19%synergy
Perpetual Timepiece
5.4%inclusion23 decks426 decks
5%synergy
Whip of Erebos
5.2%inclusion22 decks426 decks
3%synergy
Enchantments
Dress Down
41%inclusion173 decks426 decks
38%synergy
Animate Dead
40%inclusion172 decks426 decks
31%synergy
Seal of Cleansing
40%inclusion171 decks426 decks
39%synergy
Cemetery Tampering
38%inclusion162 decks426 decks
37%synergy
Defiled Crypt // Cadaver Lab
36%inclusion155 decks425 decks
36%synergy
Monologue Tax
36%inclusion154 decks426 decks
30%synergy
Cacophony Unleashed
36%inclusion152 decks426 decks
34%synergy
Propaganda
34%inclusion146 decks426 decks
6%synergy
Shark Typhoon
32%inclusion136 decks426 decks
26%synergy
Estrid's Invocation
31%inclusion131 decks426 decks
26%synergy
Ethereal Armor
30%inclusion128 decks426 decks
25%synergy
Amphibian Downpour
30%inclusion128 decks426 decks
26%synergy
Timely Ward
30%inclusion126 decks426 decks
25%synergy
Bottomless Pool // Locker Room
29%inclusion125 decks426 decks
27%synergy
All That Glitters
28%inclusion121 decks426 decks
20%synergy
Extravagant Replication
27%inclusion115 decks426 decks
22%synergy
Ghostly Prison
27%inclusion114 decks426 decks
4%synergy
Polluted Cistern // Dim Oubliette
26%inclusion110 decks426 decks
25%synergy
Necromancy
25%inclusion108 decks426 decks
21%synergy
Stillness in Motion
25%inclusion56 decks222 decks
25%synergy
The Eldest Reborn
25%inclusion106 decks426 decks
22%synergy
Mystic Remora
25%inclusion105 decks426 decks
4%synergy
Cramped Vents // Access Maze
24%inclusion102 decks426 decks
22%synergy
The Tale of Tamiyo
23%inclusion98 decks426 decks
23%synergy
Darksteel Mutation
23%inclusion97 decks426 decks
17%synergy
Restricted Office // Lecture Hall
22%inclusion93 decks426 decks
20%synergy
Starfield of Nyx
22%inclusion93 decks426 decks
18%synergy
Mirror Room // Fractured Realm
21%inclusion91 decks426 decks
19%synergy
Sheltered by Ghosts
20%inclusion86 decks426 decks
18%synergy
Imprisoned in the Moon
19%inclusion81 decks426 decks
12%synergy
Central Elevator // Promising Stairs
19%inclusion80 decks426 decks
18%synergy
Seal of Removal
19%inclusion80 decks426 decks
18%synergy
Secrets of the Dead
19%inclusion79 decks426 decks
18%synergy
Phyrexian Arena
18%inclusion78 decks426 decks
4%synergy
Hallowed Haunting
18%inclusion77 decks426 decks
16%synergy
Blind Obedience
18%inclusion76 decks426 decks
6%synergy
One with the Multiverse
17%inclusion73 decks426 decks
12%synergy
Derelict Attic // Widow's Walk
17%inclusion70 decks424 decks
16%synergy
Dazzling Theater // Prop Room
16%inclusion69 decks425 decks
15%synergy
Cast Out
16%inclusion68 decks426 decks
13%synergy
Meat Locker // Drowned Diner
16%inclusion67 decks424 decks
15%synergy
Copy Enchantment
16%inclusion67 decks426 decks
11%synergy
Unable to Scream
15%inclusion64 decks426 decks
14%synergy
Underwater Tunnel // Slimy Aquarium
14%inclusion61 decks425 decks
14%synergy
Nowhere to Run
14%inclusion59 decks426 decks
13%synergy
Teval's Judgment
14%inclusion31 decks225 decks
13%synergy
Court of Cunning
14%inclusion58 decks426 decks
13%synergy
Surgical Suite // Hospital Room
13%inclusion55 decks426 decks
13%synergy
Spirit-Sister's Call
13%inclusion55 decks426 decks
12%synergy
Funeral Room // Awakening Hall
13%inclusion54 decks426 decks
12%synergy
Battles
Invasion of Theros
11%inclusion46 decks426 decks
9%synergy
Utility Lands
Hall of Heliod's Generosity
57%inclusion243 decks426 decks
44%synergy
Bojuka Bog
47%inclusion202 decks426 decks
21%synergy
Halimar Depths
19%inclusion79 decks426 decks
14%synergy
Reliquary Tower
10%inclusion44 decks426 decks
-24%synergy
Cephalid Coliseum
8.9%inclusion38 decks426 decks
5%synergy
Takenuma, Abandoned Mire
6.3%inclusion27 decks426 decks
0%synergy
Otawara, Soaring City
6.3%inclusion27 decks426 decks
-13%synergy
Nephalia Drownyard
6.1%inclusion26 decks426 decks
6%synergy
Mana Artifacts
Arcane Signet
88%inclusion373 decks426 decks
0%synergy
Sol Ring
79%inclusion338 decks426 decks
-10%synergy
Azorius Signet
53%inclusion227 decks426 decks
23%synergy
Orzhov Signet
50%inclusion212 decks426 decks
17%synergy
Talisman of Dominance
41%inclusion173 decks426 decks
-9%synergy
Talisman of Progress
39%inclusion167 decks426 decks
-5%synergy
Talisman of Hierarchy
35%inclusion149 decks426 decks
-9%synergy
Dimir Signet
35%inclusion148 decks426 decks
4%synergy
Fellwar Stone
24%inclusion104 decks426 decks
-9%synergy
Commander's Sphere
24%inclusion101 decks426 decks
6%synergy
Mind Stone
23%inclusion98 decks426 decks
11%synergy
Chromatic Lantern
7.5%inclusion32 decks426 decks
-5%synergy
Lands
Island
99%inclusion421 decks426 decks
6%synergy
Plains
97%inclusion415 decks426 decks
6%synergy
Swamp
97%inclusion412 decks426 decks
5%synergy
Command Tower
94%inclusion399 decks426 decks
1%synergy
Arcane Sanctum
70%inclusion300 decks426 decks
16%synergy
Adarkar Wastes
62%inclusion263 decks426 decks
30%synergy
Caves of Koilos
61%inclusion260 decks426 decks
25%synergy
Underground River
54%inclusion231 decks426 decks
20%synergy
Exotic Orchard
49%inclusion210 decks426 decks
-9%synergy
Obscura Storefront
43%inclusion185 decks426 decks
34%synergy
Evolving Wilds
42%inclusion177 decks426 decks
17%synergy
Temple of Enlightenment
41%inclusion176 decks426 decks
25%synergy
Terramorphic Expanse
41%inclusion175 decks426 decks
25%synergy
Temple of Silence
40%inclusion170 decks426 decks
21%synergy
Temple of Deceit
38%inclusion164 decks426 decks
21%synergy
Glacial Fortress
38%inclusion162 decks426 decks
-4%synergy
Prairie Stream
38%inclusion161 decks426 decks
-3%synergy
Azorius Chancery
36%inclusion154 decks426 decks
23%synergy
Dimir Aqueduct
36%inclusion153 decks426 decks
23%synergy
Isolated Chapel
35%inclusion150 decks426 decks
-6%synergy
Tainted Field
35%inclusion147 decks426 decks
28%synergy
Contaminated Landscape
34%inclusion145 decks426 decks
20%synergy
Sunken Hollow
34%inclusion144 decks426 decks
-6%synergy
Tainted Isle
32%inclusion136 decks426 decks
26%synergy
Drowned Catacomb
32%inclusion136 decks426 decks
-6%synergy
Orzhov Basilica
32%inclusion136 decks426 decks
17%synergy
Valgavoth's Lair
31%inclusion130 decks426 decks
28%synergy
Godless Shrine
27%inclusion115 decks426 decks
-24%synergy
Watery Grave
27%inclusion113 decks426 decks
-24%synergy
Hallowed Fountain
27%inclusion113 decks426 decks
-24%synergy
Ash Barrens
26%inclusion111 decks426 decks
15%synergy
Raffine's Tower
26%inclusion110 decks426 decks
-15%synergy
Flooded Strand
20%inclusion86 decks426 decks
-18%synergy
Meticulous Archive
20%inclusion84 decks426 decks
6%synergy
Shadowy Backstreet
19%inclusion83 decks426 decks
7%synergy
Polluted Delta
19%inclusion83 decks426 decks
-18%synergy
Undercity Sewers
19%inclusion82 decks426 decks
5%synergy
Sea of Clouds
18%inclusion78 decks426 decks
-17%synergy
Marsh Flats
17%inclusion73 decks426 decks
-19%synergy
Gloomlake Verge
17%inclusion72 decks426 decks
6%synergy
Floodfarm Verge
17%inclusion72 decks426 decks
6%synergy
Vault of Champions
17%inclusion71 decks426 decks
-16%synergy
Shipwreck Marsh
15%inclusion65 decks426 decks
-5%synergy
Skycloud Expanse
15%inclusion65 decks426 decks
0%synergy
Morphic Pool
15%inclusion63 decks426 decks
-19%synergy
Deserted Beach
15%inclusion63 decks426 decks
-6%synergy
Darkwater Catacombs
14%inclusion60 decks426 decks
-1%synergy
Thriving Isle
14%inclusion60 decks426 decks
10%synergy
Thriving Moor
14%inclusion60 decks426 decks
10%synergy
Thriving Heath
14%inclusion59 decks426 decks
10%synergy
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