The Master of Keys (Commander) - Core

The Master of Keys
Rank #301
445decks
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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
7.9%inclusion5 decks63 decks
8%synergy
Super Intelligence
6.7%inclusion1 decks15 decks
6%synergy
Grave Researcher
3.2%inclusion2 decks63 decks
1%synergy
Bilbo, Thief in the Night
2.3%inclusion1 decks43 decks
2%synergy
Emeritus of Truce
1.8%inclusion1 decks57 decks
1%synergy
High Synergy Cards
Inquisitive Glimmer
77%inclusion342 decks445 decks
70%synergy
Mesa Enchantress
73%inclusion327 decks445 decks
65%synergy
Starfield Mystic
69%inclusion306 decks445 decks
62%synergy
Entity Tracker
65%inclusion290 decks445 decks
59%synergy
Demon of Fate's Design
63%inclusion279 decks445 decks
57%synergy
Doomwake Giant
60%inclusion266 decks445 decks
54%synergy
Fear of Sleep Paralysis
56%inclusion247 decks445 decks
51%synergy
Ripples of Undeath
53%inclusion237 decks445 decks
51%synergy
Gravebreaker Lamia
51%inclusion227 decks445 decks
50%synergy
Scrabbling Skullcrab
49%inclusion218 decks445 decks
48%synergy
Top Cards
Secret Arcade // Dusty Parlor
50%inclusion224 decks445 decks
46%synergy
Ondu Spiritdancer
50%inclusion222 decks445 decks
44%synergy
Sigil of the Empty Throne
49%inclusion220 decks445 decks
44%synergy
Mirrormade
49%inclusion216 decks445 decks
39%synergy
Swords to Plowshares
49%inclusion216 decks445 decks
-19%synergy
Sphere of Safety
47%inclusion211 decks445 decks
38%synergy
Victor, Valgavoth's Seneschal
47%inclusion209 decks445 decks
45%synergy
Redress Fate
42%inclusion189 decks445 decks
37%synergy
Fear of Impostors
42%inclusion187 decks445 decks
41%synergy
Animate Dead
41%inclusion184 decks445 decks
32%synergy
Creatures
Overlord of the Floodpits
40%inclusion177 decks445 decks
36%synergy
Soaring Lightbringer
38%inclusion167 decks445 decks
33%synergy
Ghostly Dancers
37%inclusion166 decks445 decks
35%synergy
Overlord of the Balemurk
35%inclusion156 decks445 decks
33%synergy
Zur, Eternal Schemer
31%inclusion137 decks445 decks
28%synergy
Silent Hallcreeper
30%inclusion135 decks445 decks
26%synergy
Aminatou, Veil Piercer
30%inclusion135 decks445 decks
29%synergy
Moon-Blessed Cleric
30%inclusion134 decks445 decks
25%synergy
Heliod, the Radiant Dawn
28%inclusion125 decks445 decks
25%synergy
Archon of Sun's Grace
28%inclusion124 decks445 decks
24%synergy
Grim Guardian
28%inclusion124 decks445 decks
25%synergy
Enduring Curiosity
27%inclusion120 decks445 decks
19%synergy
Athreos, Shroud-Veiled
24%inclusion108 decks445 decks
20%synergy
Zur the Enchanter
22%inclusion99 decks445 decks
17%synergy
Skullsnap Nuisance
22%inclusion96 decks445 decks
21%synergy
Archetype of Imagination
21%inclusion92 decks445 decks
16%synergy
Mindwrack Harpy
20%inclusion90 decks445 decks
20%synergy
Sage of Mysteries
20%inclusion89 decks445 decks
20%synergy
Ancient Cellarspawn
19%inclusion84 decks445 decks
16%synergy
Alseid of Life's Bounty
18%inclusion82 decks445 decks
17%synergy
Overlord of the Mistmoors
18%inclusion78 decks445 decks
16%synergy
Balemurk Leech
17%inclusion74 decks445 decks
16%synergy
Nightmare Shepherd
15%inclusion66 decks445 decks
12%synergy
Spirited Companion
14%inclusion62 decks445 decks
12%synergy
Gremlin Tamer
14%inclusion62 decks445 decks
13%synergy
Auramancer
13%inclusion59 decks445 decks
10%synergy
Fear of Infinity
13%inclusion58 decks445 decks
12%synergy
Nashi, Searcher in the Dark
13%inclusion56 decks445 decks
12%synergy
Solemn Simulacrum
12%inclusion54 decks445 decks
-1%synergy
Summon: Yojimbo
12%inclusion26 decks216 decks
11%synergy
Eiganjo Dynastorian
11%inclusion7 decks63 decks
10%synergy
Starnheim Courser
10%inclusion45 decks445 decks
7%synergy
Millikin
9.4%inclusion42 decks445 decks
9%synergy
Fear of Surveillance
8.5%inclusion38 decks445 decks
8%synergy
Creeping Peeper
8.5%inclusion38 decks445 decks
8%synergy
Metamorphosis Fanatic
8.3%inclusion37 decks445 decks
4%synergy
Arvinox, the Mind Flail
8.1%inclusion36 decks445 decks
6%synergy
Enduring Innocence
7.2%inclusion32 decks445 decks
6%synergy
Sun Titan
7.2%inclusion32 decks445 decks
-1%synergy
Appendage Amalgam
7.0%inclusion31 decks445 decks
7%synergy
Deranged Assistant
7.0%inclusion31 decks445 decks
7%synergy
Stenn, Paranoid Partisan
6.7%inclusion30 decks445 decks
5%synergy
Fear of Failed Tests
6.7%inclusion30 decks445 decks
6%synergy
Hedron Crab
6.7%inclusion30 decks445 decks
6%synergy
Witch Enchanter
6.5%inclusion29 decks445 decks
-1%synergy
Ghostly Keybearer
6.3%inclusion28 decks445 decks
6%synergy
Stitcher's Supplier
6.3%inclusion28 decks445 decks
6%synergy
Burnished Hart
6.1%inclusion27 decks445 decks
3%synergy
Enduring Tenacity
6.1%inclusion27 decks445 decks
-2%synergy
Phenomenon Investigators
6.1%inclusion27 decks445 decks
6%synergy
Instants
Arcane Denial
34%inclusion151 decks445 decks
14%synergy
Thirst for Meaning
28%inclusion125 decks445 decks
27%synergy
Path to Exile
27%inclusion119 decks445 decks
-16%synergy
Counterspell
24%inclusion107 decks445 decks
-18%synergy
Otherworldly Gaze
24%inclusion106 decks445 decks
22%synergy
Void Rend
20%inclusion91 decks445 decks
-14%synergy
Inkshield
20%inclusion88 decks445 decks
10%synergy
Frantic Search
18%inclusion79 decks445 decks
-1%synergy
An Offer You Can't Refuse
16%inclusion70 decks445 decks
-12%synergy
Utter End
14%inclusion63 decks445 decks
8%synergy
Negate
14%inclusion61 decks445 decks
-3%synergy
Brainstorm
12%inclusion54 decks445 decks
-5%synergy
Dovin's Veto
10%inclusion44 decks445 decks
-16%synergy
Dark Ritual
10%inclusion43 decks445 decks
-11%synergy
Return to Dust
9.0%inclusion40 decks445 decks
6%synergy
Generous Gift
7.6%inclusion34 decks445 decks
-6%synergy
Fell the Profane
7.2%inclusion32 decks445 decks
-2%synergy
Entomb
7.2%inclusion32 decks445 decks
0%synergy
Sink into Stupor
7.0%inclusion31 decks445 decks
-6%synergy
Swan Song
6.7%inclusion30 decks445 decks
-13%synergy
Fact or Fiction
6.5%inclusion29 decks445 decks
3%synergy
Anguished Unmaking
5.8%inclusion26 decks445 decks
-20%synergy
Unwanted Remake
5.6%inclusion25 decks445 decks
5%synergy
Telling Time
5.2%inclusion23 decks445 decks
3%synergy
Faithful Mending
5.2%inclusion23 decks445 decks
1%synergy
Sorceries
Sevinne's Reclamation
31%inclusion136 decks445 decks
22%synergy
Extinguish All Hope
24%inclusion109 decks445 decks
23%synergy
Time Wipe
24%inclusion105 decks445 decks
17%synergy
Dance of the Manse
22%inclusion97 decks445 decks
19%synergy
Singularity Rupture
18%inclusion33 decks187 decks
15%synergy
Windfall
16%inclusion70 decks445 decks
3%synergy
Resurgent Belief
12%inclusion55 decks445 decks
10%synergy
Damn
12%inclusion52 decks445 decks
-9%synergy
Glimpse the Unthinkable
11%inclusion51 decks445 decks
11%synergy
Reanimate
11%inclusion50 decks445 decks
-5%synergy
Space-Time Anomaly
10%inclusion19 decks185 decks
9%synergy
Terminus
9.4%inclusion42 decks445 decks
6%synergy
Ponder
9.2%inclusion41 decks445 decks
0%synergy
Brilliant Restoration
8.1%inclusion36 decks445 decks
6%synergy
Read the Bones
7.6%inclusion34 decks445 decks
4%synergy
Toxic Deluge
6.7%inclusion30 decks445 decks
-13%synergy
Open the Vaults
5.6%inclusion25 decks445 decks
4%synergy
Idyllic Tutor
5.6%inclusion25 decks445 decks
1%synergy
Portent
5.6%inclusion25 decks445 decks
2%synergy
Commune with Evil
5.4%inclusion24 decks445 decks
5%synergy
Diabolic Vision
5.2%inclusion23 decks445 decks
3%synergy
Utility Artifacts
Cloud Key
12%inclusion52 decks445 decks
8%synergy
Keys to the House
10%inclusion43 decks445 decks
9%synergy
Wayfarer's Bauble
8.8%inclusion39 decks445 decks
2%synergy
Lightning Greaves
8.5%inclusion38 decks445 decks
-14%synergy
Mesmeric Orb
7.9%inclusion35 decks445 decks
7%synergy
Swiftfoot Boots
5.6%inclusion25 decks445 decks
-19%synergy
Perpetual Timepiece
5.4%inclusion24 decks445 decks
5%synergy
Whip of Erebos
5.4%inclusion24 decks445 decks
3%synergy
Enchantments
Grasp of Fate
40%inclusion179 decks445 decks
34%synergy
Seal of Cleansing
40%inclusion179 decks445 decks
39%synergy
Dress Down
40%inclusion176 decks445 decks
37%synergy
Cemetery Tampering
38%inclusion170 decks445 decks
37%synergy
Defiled Crypt // Cadaver Lab
37%inclusion163 decks445 decks
36%synergy
Cacophony Unleashed
36%inclusion159 decks445 decks
34%synergy
Monologue Tax
36%inclusion159 decks445 decks
29%synergy
Propaganda
34%inclusion150 decks445 decks
5%synergy
Shark Typhoon
32%inclusion143 decks445 decks
26%synergy
Estrid's Invocation
31%inclusion138 decks445 decks
26%synergy
Ethereal Armor
30%inclusion133 decks445 decks
25%synergy
Bottomless Pool // Locker Room
30%inclusion132 decks445 decks
28%synergy
Amphibian Downpour
29%inclusion131 decks445 decks
25%synergy
Timely Ward
29%inclusion128 decks445 decks
24%synergy
Extravagant Replication
28%inclusion123 decks445 decks
23%synergy
All That Glitters
28%inclusion123 decks445 decks
19%synergy
Ghostly Prison
27%inclusion118 decks445 decks
4%synergy
Necromancy
26%inclusion115 decks445 decks
21%synergy
Polluted Cistern // Dim Oubliette
26%inclusion114 decks445 decks
25%synergy
Cramped Vents // Access Maze
25%inclusion112 decks445 decks
23%synergy
The Eldest Reborn
25%inclusion110 decks445 decks
22%synergy
Stillness in Motion
24%inclusion59 decks242 decks
24%synergy
Mystic Remora
24%inclusion108 decks445 decks
4%synergy
Darksteel Mutation
23%inclusion103 decks445 decks
17%synergy
The Tale of Tamiyo
23%inclusion101 decks445 decks
22%synergy
Restricted Office // Lecture Hall
23%inclusion101 decks445 decks
21%synergy
Starfield of Nyx
22%inclusion99 decks445 decks
18%synergy
Mirror Room // Fractured Realm
22%inclusion98 decks445 decks
20%synergy
Sheltered by Ghosts
21%inclusion95 decks445 decks
19%synergy
Central Elevator // Promising Stairs
19%inclusion86 decks445 decks
19%synergy
Imprisoned in the Moon
19%inclusion83 decks445 decks
12%synergy
Secrets of the Dead
19%inclusion83 decks445 decks
18%synergy
Seal of Removal
19%inclusion83 decks445 decks
18%synergy
Blind Obedience
18%inclusion78 decks445 decks
6%synergy
Hallowed Haunting
18%inclusion78 decks445 decks
15%synergy
Derelict Attic // Widow's Walk
17%inclusion77 decks444 decks
17%synergy
Phyrexian Arena
17%inclusion77 decks445 decks
3%synergy
One with the Multiverse
17%inclusion76 decks445 decks
12%synergy
Dazzling Theater // Prop Room
17%inclusion76 decks445 decks
16%synergy
Copy Enchantment
17%inclusion74 decks445 decks
12%synergy
Meat Locker // Drowned Diner
16%inclusion71 decks444 decks
16%synergy
Underwater Tunnel // Slimy Aquarium
16%inclusion69 decks445 decks
15%synergy
Cast Out
16%inclusion69 decks445 decks
13%synergy
Unable to Scream
15%inclusion67 decks445 decks
14%synergy
Teval's Judgment
14%inclusion35 decks245 decks
13%synergy
Surgical Suite // Hospital Room
14%inclusion63 decks445 decks
14%synergy
Court of Cunning
14%inclusion61 decks445 decks
13%synergy
Nowhere to Run
14%inclusion61 decks445 decks
13%synergy
Funeral Room // Awakening Hall
13%inclusion59 decks445 decks
12%synergy
Spirit-Sister's Call
13%inclusion58 decks445 decks
12%synergy
Battles
Invasion of Theros
11%inclusion47 decks445 decks
9%synergy
Utility Lands
Hall of Heliod's Generosity
57%inclusion255 decks445 decks
44%synergy
Bojuka Bog
47%inclusion209 decks445 decks
20%synergy
Halimar Depths
18%inclusion79 decks445 decks
13%synergy
Reliquary Tower
10%inclusion46 decks445 decks
-24%synergy
Cephalid Coliseum
8.5%inclusion38 decks445 decks
5%synergy
Nephalia Drownyard
6.5%inclusion29 decks445 decks
6%synergy
Otawara, Soaring City
6.3%inclusion28 decks445 decks
-13%synergy
Takenuma, Abandoned Mire
6.3%inclusion28 decks445 decks
-0%synergy
Mana Artifacts
Arcane Signet
87%inclusion386 decks445 decks
-1%synergy
Sol Ring
78%inclusion349 decks445 decks
-11%synergy
Azorius Signet
53%inclusion235 decks445 decks
23%synergy
Orzhov Signet
49%inclusion218 decks445 decks
17%synergy
Talisman of Dominance
40%inclusion180 decks445 decks
-10%synergy
Talisman of Progress
39%inclusion175 decks445 decks
-5%synergy
Talisman of Hierarchy
34%inclusion153 decks445 decks
-10%synergy
Dimir Signet
34%inclusion152 decks445 decks
4%synergy
Fellwar Stone
24%inclusion108 decks445 decks
-9%synergy
Commander's Sphere
24%inclusion105 decks445 decks
6%synergy
Mind Stone
23%inclusion104 decks445 decks
12%synergy
Chromatic Lantern
7.6%inclusion34 decks445 decks
-5%synergy
Lands
Island
99%inclusion440 decks445 decks
6%synergy
Plains
97%inclusion433 decks445 decks
5%synergy
Swamp
97%inclusion430 decks445 decks
5%synergy
Command Tower
93%inclusion415 decks445 decks
1%synergy
Arcane Sanctum
71%inclusion315 decks445 decks
17%synergy
Adarkar Wastes
62%inclusion274 decks445 decks
29%synergy
Caves of Koilos
61%inclusion272 decks445 decks
25%synergy
Underground River
54%inclusion241 decks445 decks
19%synergy
Exotic Orchard
49%inclusion218 decks445 decks
-10%synergy
Obscura Storefront
42%inclusion189 decks445 decks
33%synergy
Terramorphic Expanse
41%inclusion184 decks445 decks
26%synergy
Evolving Wilds
41%inclusion183 decks445 decks
17%synergy
Temple of Enlightenment
41%inclusion181 decks445 decks
25%synergy
Temple of Silence
39%inclusion175 decks445 decks
21%synergy
Glacial Fortress
39%inclusion172 decks445 decks
-5%synergy
Temple of Deceit
38%inclusion170 decks445 decks
21%synergy
Prairie Stream
37%inclusion163 decks445 decks
-4%synergy
Isolated Chapel
36%inclusion162 decks445 decks
-6%synergy
Dimir Aqueduct
35%inclusion157 decks445 decks
23%synergy
Azorius Chancery
35%inclusion156 decks445 decks
22%synergy
Sunken Hollow
33%inclusion149 decks445 decks
-6%synergy
Tainted Field
33%inclusion148 decks445 decks
26%synergy
Contaminated Landscape
33%inclusion145 decks445 decks
19%synergy
Drowned Catacomb
32%inclusion144 decks445 decks
-6%synergy
Tainted Isle
31%inclusion139 decks445 decks
25%synergy
Orzhov Basilica
31%inclusion137 decks445 decks
16%synergy
Valgavoth's Lair
31%inclusion136 decks445 decks
28%synergy
Godless Shrine
28%inclusion123 decks445 decks
-24%synergy
Watery Grave
27%inclusion122 decks445 decks
-24%synergy
Hallowed Fountain
27%inclusion121 decks445 decks
-24%synergy
Raffine's Tower
26%inclusion117 decks445 decks
-14%synergy
Ash Barrens
26%inclusion114 decks445 decks
15%synergy
Flooded Strand
20%inclusion90 decks445 decks
-18%synergy
Meticulous Archive
20%inclusion89 decks445 decks
6%synergy
Shadowy Backstreet
19%inclusion86 decks445 decks
7%synergy
Undercity Sewers
19%inclusion85 decks445 decks
4%synergy
Polluted Delta
19%inclusion85 decks445 decks
-19%synergy
Sea of Clouds
18%inclusion81 decks445 decks
-17%synergy
Gloomlake Verge
18%inclusion78 decks445 decks
7%synergy
Floodfarm Verge
18%inclusion78 decks445 decks
6%synergy
Marsh Flats
17%inclusion77 decks445 decks
-19%synergy
Vault of Champions
17%inclusion76 decks445 decks
-15%synergy
Shipwreck Marsh
16%inclusion69 decks445 decks
-5%synergy
Morphic Pool
15%inclusion67 decks445 decks
-18%synergy
Skycloud Expanse
15%inclusion66 decks445 decks
-0%synergy
Darkwater Catacombs
14%inclusion64 decks445 decks
-0%synergy
Deserted Beach
14%inclusion64 decks445 decks
-6%synergy
Thriving Isle
14%inclusion61 decks445 decks
9%synergy
Thriving Moor
14%inclusion61 decks445 decks
10%synergy
Thriving Heath
13%inclusion60 decks445 decks
9%synergy
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