The Master of Keys (Commander) - Core

The Master of Keys
Rank #303
450decks
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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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Sorceries
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Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
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Super Intelligence
8.7%inclusion2 decks23 decks
8%synergy
Bilbo, Thief in the Night
4.1%inclusion2 decks49 decks
4%synergy
High Synergy Cards
Inquisitive Glimmer
76%inclusion344 decks450 decks
69%synergy
Mesa Enchantress
73%inclusion329 decks450 decks
65%synergy
Starfield Mystic
68%inclusion307 decks450 decks
62%synergy
Entity Tracker
65%inclusion293 decks450 decks
59%synergy
Demon of Fate's Design
62%inclusion280 decks450 decks
57%synergy
Doomwake Giant
60%inclusion268 decks450 decks
54%synergy
Ripples of Undeath
54%inclusion241 decks450 decks
51%synergy
Fear of Sleep Paralysis
55%inclusion248 decks450 decks
50%synergy
Gravebreaker Lamia
51%inclusion230 decks450 decks
50%synergy
Scrabbling Skullcrab
49%inclusion220 decks450 decks
48%synergy
Top Cards
Secret Arcade // Dusty Parlor
50%inclusion225 decks450 decks
46%synergy
Ondu Spiritdancer
50%inclusion224 decks450 decks
44%synergy
Sigil of the Empty Throne
49%inclusion221 decks450 decks
43%synergy
Mirrormade
49%inclusion219 decks450 decks
39%synergy
Swords to Plowshares
48%inclusion217 decks450 decks
-20%synergy
Sphere of Safety
47%inclusion212 decks450 decks
38%synergy
Victor, Valgavoth's Seneschal
47%inclusion210 decks450 decks
45%synergy
Redress Fate
42%inclusion190 decks450 decks
37%synergy
Fear of Impostors
42%inclusion188 decks450 decks
40%synergy
Animate Dead
41%inclusion186 decks450 decks
32%synergy
Creatures
Overlord of the Floodpits
40%inclusion179 decks450 decks
36%synergy
Soaring Lightbringer
37%inclusion167 decks450 decks
33%synergy
Ghostly Dancers
37%inclusion167 decks450 decks
35%synergy
Overlord of the Balemurk
35%inclusion157 decks450 decks
33%synergy
Zur, Eternal Schemer
31%inclusion138 decks450 decks
27%synergy
Silent Hallcreeper
30%inclusion136 decks450 decks
26%synergy
Moon-Blessed Cleric
30%inclusion135 decks450 decks
25%synergy
Aminatou, Veil Piercer
30%inclusion135 decks450 decks
29%synergy
Archon of Sun's Grace
28%inclusion125 decks450 decks
23%synergy
Heliod, the Radiant Dawn
28%inclusion125 decks450 decks
24%synergy
Grim Guardian
28%inclusion124 decks450 decks
25%synergy
Enduring Curiosity
27%inclusion120 decks450 decks
19%synergy
Athreos, Shroud-Veiled
24%inclusion108 decks450 decks
20%synergy
Zur the Enchanter
22%inclusion100 decks450 decks
17%synergy
Skullsnap Nuisance
21%inclusion96 decks450 decks
21%synergy
Archetype of Imagination
20%inclusion92 decks450 decks
16%synergy
Mindwrack Harpy
20%inclusion91 decks450 decks
20%synergy
Sage of Mysteries
20%inclusion89 decks450 decks
19%synergy
Ancient Cellarspawn
19%inclusion84 decks450 decks
16%synergy
Alseid of Life's Bounty
18%inclusion83 decks450 decks
17%synergy
Overlord of the Mistmoors
17%inclusion78 decks450 decks
15%synergy
Balemurk Leech
16%inclusion74 decks450 decks
16%synergy
Nightmare Shepherd
15%inclusion66 decks450 decks
12%synergy
Gremlin Tamer
14%inclusion62 decks450 decks
13%synergy
Spirited Companion
14%inclusion62 decks450 decks
12%synergy
Auramancer
13%inclusion59 decks450 decks
10%synergy
Fear of Infinity
13%inclusion58 decks450 decks
12%synergy
Nashi, Searcher in the Dark
13%inclusion57 decks450 decks
12%synergy
Solemn Simulacrum
12%inclusion54 decks450 decks
-1%synergy
Summon: Yojimbo
12%inclusion26 decks222 decks
11%synergy
Eiganjo Dynastorian
10%inclusion7 decks69 decks
9%synergy
Starnheim Courser
10%inclusion45 decks450 decks
6%synergy
Millikin
9.3%inclusion42 decks450 decks
9%synergy
Metamorphosis Fanatic
8.4%inclusion38 decks450 decks
4%synergy
Fear of Surveillance
8.4%inclusion38 decks450 decks
8%synergy
Creeping Peeper
8.4%inclusion38 decks450 decks
8%synergy
Arvinox, the Mind Flail
8.0%inclusion36 decks450 decks
6%synergy
Hedron Crab
7.3%inclusion33 decks450 decks
7%synergy
Sun Titan
7.3%inclusion33 decks450 decks
-1%synergy
Enduring Innocence
7.1%inclusion32 decks450 decks
6%synergy
Deranged Assistant
6.9%inclusion31 decks450 decks
7%synergy
Appendage Amalgam
6.9%inclusion31 decks450 decks
7%synergy
Stenn, Paranoid Partisan
6.7%inclusion30 decks450 decks
5%synergy
Witch Enchanter
6.7%inclusion30 decks450 decks
-0%synergy
Fear of Failed Tests
6.7%inclusion30 decks450 decks
6%synergy
Stitcher's Supplier
6.4%inclusion29 decks450 decks
6%synergy
Ghostly Keybearer
6.2%inclusion28 decks450 decks
6%synergy
Burnished Hart
6.0%inclusion27 decks450 decks
3%synergy
Enduring Tenacity
6.0%inclusion27 decks450 decks
-2%synergy
Phenomenon Investigators
6.0%inclusion27 decks450 decks
5%synergy
Instants
Arcane Denial
34%inclusion151 decks450 decks
13%synergy
Thirst for Meaning
28%inclusion125 decks450 decks
26%synergy
Path to Exile
27%inclusion122 decks450 decks
-15%synergy
Otherworldly Gaze
24%inclusion108 decks450 decks
22%synergy
Counterspell
24%inclusion107 decks450 decks
-18%synergy
Void Rend
20%inclusion92 decks450 decks
-14%synergy
Inkshield
20%inclusion88 decks450 decks
10%synergy
Frantic Search
18%inclusion81 decks450 decks
-1%synergy
An Offer You Can't Refuse
16%inclusion71 decks450 decks
-12%synergy
Utter End
14%inclusion63 decks450 decks
8%synergy
Negate
14%inclusion61 decks450 decks
-3%synergy
Brainstorm
12%inclusion54 decks450 decks
-5%synergy
Dovin's Veto
10%inclusion45 decks450 decks
-16%synergy
Dark Ritual
10%inclusion44 decks450 decks
-10%synergy
Return to Dust
8.9%inclusion40 decks450 decks
6%synergy
Generous Gift
7.8%inclusion35 decks450 decks
-6%synergy
Fell the Profane
7.6%inclusion34 decks450 decks
-2%synergy
Entomb
7.3%inclusion33 decks450 decks
1%synergy
Sink into Stupor
7.1%inclusion32 decks450 decks
-6%synergy
Swan Song
6.9%inclusion31 decks450 decks
-13%synergy
Fact or Fiction
6.7%inclusion30 decks450 decks
3%synergy
Anguished Unmaking
5.8%inclusion26 decks450 decks
-20%synergy
Unwanted Remake
5.6%inclusion25 decks450 decks
5%synergy
Telling Time
5.1%inclusion23 decks450 decks
3%synergy
Sorceries
Sevinne's Reclamation
31%inclusion138 decks450 decks
22%synergy
Extinguish All Hope
24%inclusion109 decks450 decks
23%synergy
Time Wipe
23%inclusion105 decks450 decks
17%synergy
Dance of the Manse
22%inclusion97 decks450 decks
18%synergy
Singularity Rupture
17%inclusion33 decks193 decks
15%synergy
Windfall
16%inclusion71 decks450 decks
3%synergy
Resurgent Belief
12%inclusion56 decks450 decks
11%synergy
Reanimate
12%inclusion52 decks450 decks
-5%synergy
Damn
12%inclusion52 decks450 decks
-9%synergy
Glimpse the Unthinkable
11%inclusion51 decks450 decks
11%synergy
Space-Time Anomaly
9.4%inclusion18 decks191 decks
8%synergy
Terminus
9.3%inclusion42 decks450 decks
5%synergy
Ponder
9.1%inclusion41 decks450 decks
0%synergy
Brilliant Restoration
8.0%inclusion36 decks450 decks
6%synergy
Read the Bones
7.6%inclusion34 decks450 decks
4%synergy
Toxic Deluge
6.7%inclusion30 decks450 decks
-13%synergy
Commune with Evil
5.6%inclusion25 decks450 decks
5%synergy
Open the Vaults
5.6%inclusion25 decks450 decks
4%synergy
Idyllic Tutor
5.6%inclusion25 decks450 decks
1%synergy
Portent
5.6%inclusion25 decks450 decks
2%synergy
Diabolic Vision
5.1%inclusion23 decks450 decks
3%synergy
Utility Artifacts
Cloud Key
12%inclusion52 decks450 decks
8%synergy
Keys to the House
10%inclusion43 decks450 decks
9%synergy
Wayfarer's Bauble
9.1%inclusion41 decks450 decks
2%synergy
Lightning Greaves
8.7%inclusion39 decks450 decks
-14%synergy
Mesmeric Orb
8.2%inclusion37 decks450 decks
7%synergy
Swiftfoot Boots
5.6%inclusion25 decks450 decks
-19%synergy
Perpetual Timepiece
5.3%inclusion24 decks450 decks
5%synergy
Whip of Erebos
5.3%inclusion24 decks450 decks
3%synergy
Enchantments
Grasp of Fate
40%inclusion182 decks450 decks
34%synergy
Seal of Cleansing
40%inclusion181 decks450 decks
39%synergy
Dress Down
40%inclusion179 decks450 decks
38%synergy
Cemetery Tampering
38%inclusion171 decks450 decks
37%synergy
Defiled Crypt // Cadaver Lab
36%inclusion164 decks450 decks
36%synergy
Cacophony Unleashed
36%inclusion160 decks450 decks
34%synergy
Monologue Tax
35%inclusion159 decks450 decks
29%synergy
Propaganda
34%inclusion151 decks450 decks
4%synergy
Shark Typhoon
32%inclusion144 decks450 decks
26%synergy
Estrid's Invocation
31%inclusion141 decks450 decks
27%synergy
Ethereal Armor
30%inclusion134 decks450 decks
25%synergy
Bottomless Pool // Locker Room
30%inclusion133 decks450 decks
28%synergy
Amphibian Downpour
29%inclusion132 decks450 decks
25%synergy
Timely Ward
28%inclusion128 decks450 decks
24%synergy
Extravagant Replication
27%inclusion123 decks450 decks
22%synergy
All That Glitters
27%inclusion123 decks450 decks
19%synergy
Ghostly Prison
26%inclusion119 decks450 decks
4%synergy
Necromancy
26%inclusion117 decks450 decks
22%synergy
Polluted Cistern // Dim Oubliette
26%inclusion115 decks450 decks
25%synergy
Cramped Vents // Access Maze
25%inclusion113 decks450 decks
23%synergy
The Eldest Reborn
24%inclusion110 decks450 decks
22%synergy
Mystic Remora
24%inclusion110 decks450 decks
4%synergy
Stillness in Motion
24%inclusion60 decks248 decks
24%synergy
Darksteel Mutation
23%inclusion104 decks450 decks
17%synergy
The Tale of Tamiyo
23%inclusion103 decks450 decks
22%synergy
Restricted Office // Lecture Hall
23%inclusion103 decks450 decks
21%synergy
Starfield of Nyx
22%inclusion101 decks450 decks
18%synergy
Mirror Room // Fractured Realm
22%inclusion100 decks450 decks
20%synergy
Sheltered by Ghosts
21%inclusion96 decks450 decks
19%synergy
Central Elevator // Promising Stairs
20%inclusion88 decks450 decks
19%synergy
Imprisoned in the Moon
19%inclusion84 decks450 decks
12%synergy
Secrets of the Dead
19%inclusion84 decks450 decks
18%synergy
Seal of Removal
18%inclusion83 decks450 decks
18%synergy
Derelict Attic // Widow's Walk
18%inclusion79 decks449 decks
17%synergy
Hallowed Haunting
18%inclusion79 decks450 decks
15%synergy
Blind Obedience
17%inclusion78 decks450 decks
5%synergy
Phyrexian Arena
17%inclusion78 decks450 decks
3%synergy
Dazzling Theater // Prop Room
17%inclusion77 decks450 decks
16%synergy
One with the Multiverse
17%inclusion76 decks450 decks
12%synergy
Copy Enchantment
17%inclusion76 decks450 decks
12%synergy
Meat Locker // Drowned Diner
16%inclusion72 decks449 decks
16%synergy
Underwater Tunnel // Slimy Aquarium
16%inclusion70 decks450 decks
15%synergy
Cast Out
15%inclusion69 decks450 decks
13%synergy
Unable to Scream
15%inclusion67 decks450 decks
14%synergy
Surgical Suite // Hospital Room
14%inclusion64 decks450 decks
14%synergy
Nowhere to Run
14%inclusion63 decks450 decks
13%synergy
Teval's Judgment
14%inclusion35 decks251 decks
13%synergy
Court of Cunning
14%inclusion61 decks450 decks
13%synergy
Funeral Room // Awakening Hall
13%inclusion60 decks450 decks
12%synergy
Spirit-Sister's Call
13%inclusion58 decks450 decks
12%synergy
Battles
Invasion of Theros
10%inclusion47 decks450 decks
9%synergy
Utility Lands
Hall of Heliod's Generosity
57%inclusion255 decks450 decks
44%synergy
Bojuka Bog
46%inclusion209 decks450 decks
20%synergy
Halimar Depths
18%inclusion80 decks450 decks
13%synergy
Reliquary Tower
10%inclusion45 decks450 decks
-24%synergy
Cephalid Coliseum
8.7%inclusion39 decks450 decks
5%synergy
Nephalia Drownyard
6.4%inclusion29 decks450 decks
6%synergy
Takenuma, Abandoned Mire
6.4%inclusion29 decks450 decks
0%synergy
Otawara, Soaring City
6.4%inclusion29 decks450 decks
-13%synergy
Mana Artifacts
Arcane Signet
86%inclusion387 decks450 decks
-2%synergy
Sol Ring
78%inclusion352 decks450 decks
-11%synergy
Azorius Signet
52%inclusion236 decks450 decks
23%synergy
Orzhov Signet
49%inclusion219 decks450 decks
17%synergy
Talisman of Dominance
40%inclusion181 decks450 decks
-10%synergy
Talisman of Progress
39%inclusion176 decks450 decks
-5%synergy
Talisman of Hierarchy
34%inclusion154 decks450 decks
-11%synergy
Dimir Signet
34%inclusion153 decks450 decks
4%synergy
Fellwar Stone
24%inclusion108 decks450 decks
-9%synergy
Commander's Sphere
23%inclusion105 decks450 decks
6%synergy
Mind Stone
23%inclusion105 decks450 decks
12%synergy
Chromatic Lantern
7.6%inclusion34 decks450 decks
-5%synergy
Lands
Island
99%inclusion445 decks450 decks
6%synergy
Plains
97%inclusion438 decks450 decks
5%synergy
Swamp
97%inclusion435 decks450 decks
5%synergy
Command Tower
93%inclusion418 decks450 decks
0%synergy
Arcane Sanctum
70%inclusion316 decks450 decks
16%synergy
Adarkar Wastes
62%inclusion277 decks450 decks
29%synergy
Caves of Koilos
61%inclusion275 decks450 decks
25%synergy
Underground River
54%inclusion244 decks450 decks
19%synergy
Exotic Orchard
49%inclusion220 decks450 decks
-10%synergy
Obscura Storefront
42%inclusion189 decks450 decks
33%synergy
Terramorphic Expanse
41%inclusion186 decks450 decks
26%synergy
Evolving Wilds
41%inclusion184 decks450 decks
17%synergy
Temple of Enlightenment
40%inclusion182 decks450 decks
25%synergy
Temple of Silence
39%inclusion176 decks450 decks
21%synergy
Glacial Fortress
38%inclusion173 decks450 decks
-5%synergy
Temple of Deceit
38%inclusion171 decks450 decks
21%synergy
Prairie Stream
36%inclusion164 decks450 decks
-4%synergy
Isolated Chapel
36%inclusion163 decks450 decks
-6%synergy
Dimir Aqueduct
35%inclusion159 decks450 decks
23%synergy
Azorius Chancery
35%inclusion158 decks450 decks
22%synergy
Sunken Hollow
33%inclusion150 decks450 decks
-6%synergy
Tainted Field
33%inclusion149 decks450 decks
26%synergy
Contaminated Landscape
32%inclusion146 decks450 decks
19%synergy
Drowned Catacomb
32%inclusion144 decks450 decks
-6%synergy
Tainted Isle
31%inclusion141 decks450 decks
25%synergy
Orzhov Basilica
31%inclusion139 decks450 decks
16%synergy
Valgavoth's Lair
31%inclusion138 decks450 decks
28%synergy
Godless Shrine
28%inclusion124 decks450 decks
-24%synergy
Watery Grave
27%inclusion123 decks450 decks
-24%synergy
Hallowed Fountain
27%inclusion122 decks450 decks
-24%synergy
Raffine's Tower
26%inclusion118 decks450 decks
-14%synergy
Ash Barrens
25%inclusion114 decks450 decks
15%synergy
Flooded Strand
20%inclusion92 decks450 decks
-18%synergy
Meticulous Archive
20%inclusion91 decks450 decks
6%synergy
Shadowy Backstreet
19%inclusion87 decks450 decks
7%synergy
Polluted Delta
19%inclusion87 decks450 decks
-19%synergy
Undercity Sewers
19%inclusion86 decks450 decks
4%synergy
Sea of Clouds
18%inclusion83 decks450 decks
-16%synergy
Gloomlake Verge
18%inclusion80 decks450 decks
7%synergy
Floodfarm Verge
18%inclusion79 decks450 decks
6%synergy
Vault of Champions
17%inclusion78 decks450 decks
-15%synergy
Marsh Flats
17%inclusion78 decks450 decks
-19%synergy
Shipwreck Marsh
16%inclusion70 decks450 decks
-5%synergy
Morphic Pool
15%inclusion69 decks450 decks
-18%synergy
Skycloud Expanse
15%inclusion67 decks450 decks
-0%synergy
Darkwater Catacombs
14%inclusion65 decks450 decks
-0%synergy
Deserted Beach
14%inclusion65 decks450 decks
-6%synergy
Thriving Isle
14%inclusion62 decks450 decks
10%synergy
Thriving Moor
14%inclusion62 decks450 decks
10%synergy
Thriving Heath
14%inclusion61 decks450 decks
9%synergy
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