The Master of Keys (Commander) - Upgraded Control

The Master of Keys
Rank #307
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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
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Mornsong Aria
7.7%inclusion1 decks13 decks
7%synergy
High Synergy Cards
Ripples of Undeath
79%inclusion30 decks38 decks
76%synergy
Inquisitive Glimmer
79%inclusion30 decks38 decks
71%synergy
Entity Tracker
76%inclusion29 decks38 decks
70%synergy
Dress Down
68%inclusion26 decks38 decks
66%synergy
Animate Dead
74%inclusion28 decks38 decks
64%synergy
Starfield Mystic
68%inclusion26 decks38 decks
62%synergy
Gravebreaker Lamia
61%inclusion23 decks38 decks
60%synergy
Amphibian Downpour
61%inclusion23 decks38 decks
56%synergy
Necromancy
61%inclusion23 decks38 decks
56%synergy
Hall of Heliod's Generosity
68%inclusion26 decks38 decks
55%synergy
Top Cards
Mystic Remora
66%inclusion25 decks38 decks
45%synergy
Demon of Fate's Design
61%inclusion23 decks38 decks
55%synergy
Mesa Enchantress
58%inclusion22 decks38 decks
49%synergy
Scrabbling Skullcrab
55%inclusion21 decks38 decks
54%synergy
Doomwake Giant
55%inclusion21 decks38 decks
49%synergy
Fear of Impostors
53%inclusion20 decks38 decks
51%synergy
Swords to Plowshares
53%inclusion20 decks38 decks
-16%synergy
Sevinne's Reclamation
47%inclusion18 decks38 decks
38%synergy
Grasp of Fate
47%inclusion18 decks38 decks
41%synergy
Overlord of the Floodpits
47%inclusion18 decks38 decks
44%synergy
Game Changers
Smothering Tithe
37%inclusion14 decks38 decks
5%synergy
Rhystic Study
29%inclusion11 decks38 decks
-3%synergy
Gifts Ungiven
13%inclusion5 decks38 decks
11%synergy
Enlightened Tutor
11%inclusion4 decks38 decks
-9%synergy
Teferi's Protection
7.9%inclusion3 decks38 decks
-9%synergy
Consecrated Sphinx
7.9%inclusion3 decks38 decks
2%synergy
Serra's Sanctum
5.3%inclusion2 decks38 decks
3%synergy
Intuition
5.3%inclusion2 decks38 decks
4%synergy
Demonic Tutor
5.3%inclusion2 decks38 decks
-16%synergy
Cyclonic Rift
5.3%inclusion2 decks38 decks
-19%synergy
Creatures
Fear of Sleep Paralysis
47%inclusion18 decks38 decks
42%synergy
Zur, Eternal Schemer
47%inclusion18 decks38 decks
44%synergy
Overlord of the Balemurk
45%inclusion17 decks38 decks
43%synergy
Ondu Spiritdancer
42%inclusion16 decks38 decks
36%synergy
Heliod, the Radiant Dawn
37%inclusion14 decks38 decks
33%synergy
Victor, Valgavoth's Seneschal
34%inclusion13 decks38 decks
32%synergy
Silent Hallcreeper
32%inclusion12 decks38 decks
27%synergy
Grim Guardian
26%inclusion10 decks38 decks
24%synergy
Ghostly Dancers
26%inclusion10 decks38 decks
24%synergy
Zur the Enchanter
24%inclusion9 decks38 decks
18%synergy
Archon of Sun's Grace
21%inclusion8 decks38 decks
16%synergy
Abdel Adrian, Gorion's Ward
21%inclusion8 decks38 decks
19%synergy
Sage of Mysteries
18%inclusion7 decks38 decks
18%synergy
Ledger Shredder
18%inclusion7 decks38 decks
10%synergy
Stenn, Paranoid Partisan
16%inclusion6 decks38 decks
14%synergy
Lotho, Corrupt Shirriff
16%inclusion6 decks38 decks
-1%synergy
Ancient Cellarspawn
16%inclusion6 decks38 decks
13%synergy
Hullbreaker Horror
16%inclusion6 decks38 decks
10%synergy
Valley Floodcaller
13%inclusion5 decks38 decks
9%synergy
Overlord of the Mistmoors
13%inclusion5 decks38 decks
11%synergy
Moon-Blessed Cleric
13%inclusion5 decks38 decks
8%synergy
Enduring Curiosity
13%inclusion5 decks38 decks
5%synergy
Balemurk Leech
13%inclusion5 decks38 decks
12%synergy
Lurrus of the Dream-Den
11%inclusion4 decks38 decks
9%synergy
Mindwrack Harpy
11%inclusion4 decks38 decks
10%synergy
Athreos, Shroud-Veiled
11%inclusion4 decks38 decks
6%synergy
Nashi, Searcher in the Dark
11%inclusion4 decks38 decks
10%synergy
Aminatou, Veil Piercer
11%inclusion4 decks38 decks
9%synergy
Toxrill, the Corrosive
11%inclusion4 decks38 decks
8%synergy
Emet-Selch of the Third Seat
9.1%inclusion3 decks33 decks
-1%synergy
Starnheim Courser
7.9%inclusion3 decks38 decks
4%synergy
Fear of Infinity
7.9%inclusion3 decks38 decks
7%synergy
Witch Enchanter
7.9%inclusion3 decks38 decks
1%synergy
Soaring Lightbringer
7.9%inclusion3 decks38 decks
3%synergy
Angel of Suffering
7.9%inclusion3 decks38 decks
8%synergy
Doom Whisperer
7.9%inclusion3 decks38 decks
6%synergy
Esper Sentinel
7.9%inclusion3 decks38 decks
-20%synergy
Alseid of Life's Bounty
7.9%inclusion3 decks38 decks
6%synergy
Hedron Crab
7.9%inclusion3 decks38 decks
7%synergy
Skullsnap Nuisance
7.9%inclusion3 decks38 decks
7%synergy
Spirited Companion
7.9%inclusion3 decks38 decks
6%synergy
Archetype of Imagination
7.9%inclusion3 decks38 decks
3%synergy
Neerdiv, Devious Diver
7.9%inclusion3 decks38 decks
8%synergy
Summon: Bahamut
6.1%inclusion2 decks33 decks
5%synergy
Eidolon of Rhetoric
5.3%inclusion2 decks38 decks
4%synergy
Gray Merchant of Asphodel
5.3%inclusion2 decks38 decks
1%synergy
Deranged Assistant
5.3%inclusion2 decks38 decks
5%synergy
Dream Eater
5.3%inclusion2 decks38 decks
5%synergy
Nezahal, Primal Tide
5.3%inclusion2 decks38 decks
1%synergy
Horrid Shadowspinner
5.3%inclusion2 decks38 decks
5%synergy
Instants
An Offer You Can't Refuse
42%inclusion16 decks38 decks
15%synergy
Arcane Denial
39%inclusion15 decks38 decks
19%synergy
Entomb
32%inclusion12 decks38 decks
25%synergy
Counterspell
32%inclusion12 decks38 decks
-10%synergy
Swan Song
29%inclusion11 decks38 decks
9%synergy
Void Rend
24%inclusion9 decks38 decks
-10%synergy
Path to Exile
24%inclusion9 decks38 decks
-18%synergy
Mana Drain
21%inclusion8 decks38 decks
4%synergy
Sink into Stupor
18%inclusion7 decks38 decks
6%synergy
Negate
16%inclusion6 decks38 decks
-1%synergy
Thirst for Meaning
16%inclusion6 decks38 decks
14%synergy
Dark Ritual
16%inclusion6 decks38 decks
-4%synergy
Inkshield
16%inclusion6 decks38 decks
6%synergy
Dovin's Veto
13%inclusion5 decks38 decks
-12%synergy
Fact or Fiction
13%inclusion5 decks38 decks
9%synergy
Anguished Unmaking
11%inclusion4 decks38 decks
-15%synergy
Generous Gift
11%inclusion4 decks38 decks
-4%synergy
Fell the Profane
7.9%inclusion3 decks38 decks
-1%synergy
Strix Serenade
7.9%inclusion3 decks38 decks
4%synergy
Faithful Mending
7.9%inclusion3 decks38 decks
4%synergy
Frantic Search
5.3%inclusion2 decks38 decks
-12%synergy
Dawn's Truce
5.3%inclusion2 decks38 decks
1%synergy
Brainstorm
5.3%inclusion2 decks38 decks
-12%synergy
Lim-Dûl's Vault
5.3%inclusion2 decks38 decks
2%synergy
Flare of Fortitude
5.3%inclusion2 decks38 decks
3%synergy
Darkblast
5.3%inclusion2 decks38 decks
5%synergy
Jwari Disruption
5.3%inclusion2 decks38 decks
5%synergy
Delay
5.3%inclusion2 decks38 decks
3%synergy
Otherworldly Gaze
5.3%inclusion2 decks38 decks
3%synergy
Utter End
5.3%inclusion2 decks38 decks
-1%synergy
Drown in Dreams
5.3%inclusion2 decks38 decks
5%synergy
Pact of Negation
5.3%inclusion2 decks38 decks
-3%synergy
Sorceries
Extinguish All Hope
21%inclusion8 decks38 decks
19%synergy
Redress Fate
21%inclusion8 decks38 decks
15%synergy
Dance of the Manse
21%inclusion8 decks38 decks
18%synergy
Supreme Verdict
18%inclusion7 decks38 decks
4%synergy
Windfall
18%inclusion7 decks38 decks
5%synergy
Glimpse the Unthinkable
18%inclusion7 decks38 decks
18%synergy
Reanimate
18%inclusion7 decks38 decks
2%synergy
Singularity Rupture
17%inclusion5 decks30 decks
14%synergy
Toxic Deluge
16%inclusion6 decks38 decks
-4%synergy
Damn
16%inclusion6 decks38 decks
-5%synergy
Resurgent Belief
13%inclusion5 decks38 decks
11%synergy
Idyllic Tutor
13%inclusion5 decks38 decks
9%synergy
Wrath of God
13%inclusion5 decks38 decks
9%synergy
Farewell
11%inclusion4 decks38 decks
-3%synergy
Traumatize
11%inclusion4 decks38 decks
10%synergy
Buried Alive
11%inclusion4 decks38 decks
6%synergy
Space-Time Anomaly
10%inclusion3 decks30 decks
8%synergy
Open the Vaults
7.9%inclusion3 decks38 decks
7%synergy
Time Wipe
7.9%inclusion3 decks38 decks
1%synergy
Cut Your Losses
7.9%inclusion3 decks38 decks
8%synergy
Demonic Counsel
7.9%inclusion3 decks38 decks
7%synergy
Breach the Multiverse
7.9%inclusion3 decks38 decks
6%synergy
Ponder
5.3%inclusion2 decks38 decks
-4%synergy
Incarnation Technique
5.3%inclusion2 decks38 decks
5%synergy
Ondu Inversion
5.3%inclusion2 decks38 decks
4%synergy
Slaughter the Strong
5.3%inclusion2 decks38 decks
5%synergy
Replenish
5.3%inclusion2 decks38 decks
4%synergy
Night's Whisper
5.3%inclusion2 decks38 decks
3%synergy
Brilliant Restoration
5.3%inclusion2 decks38 decks
3%synergy
Compulsive Research
5.3%inclusion2 decks38 decks
5%synergy
Utility Artifacts
Mesmeric Orb
29%inclusion11 decks38 decks
28%synergy
Lightning Greaves
24%inclusion9 decks38 decks
1%synergy
Cloud Key
11%inclusion4 decks38 decks
7%synergy
Crucible of Worlds
7.9%inclusion3 decks38 decks
7%synergy
Whip of Erebos
7.9%inclusion3 decks38 decks
6%synergy
Swiftfoot Boots
7.9%inclusion3 decks38 decks
-16%synergy
Perpetual Timepiece
5.3%inclusion2 decks38 decks
5%synergy
Mask of the Schemer
5.3%inclusion2 decks38 decks
4%synergy
Palantír of Orthanc
5.3%inclusion2 decks38 decks
4%synergy
Wishclaw Talisman
5.3%inclusion2 decks38 decks
-3%synergy
Expedition Map
5.3%inclusion2 decks38 decks
4%synergy
Enchantments
Blind Obedience
47%inclusion18 decks38 decks
35%synergy
Sphere of Safety
47%inclusion18 decks38 decks
38%synergy
Cemetery Tampering
47%inclusion18 decks38 decks
47%synergy
Ghostly Prison
45%inclusion17 decks38 decks
23%synergy
Mirrormade
45%inclusion17 decks38 decks
35%synergy
Dance of the Dead
42%inclusion16 decks38 decks
40%synergy
Sigil of the Empty Throne
42%inclusion16 decks38 decks
36%synergy
Seal of Cleansing
42%inclusion16 decks38 decks
41%synergy
Secret Arcade // Dusty Parlor
42%inclusion16 decks38 decks
37%synergy
Propaganda
42%inclusion16 decks38 decks
15%synergy
Out of the Tombs
39%inclusion15 decks38 decks
39%synergy
Estrid's Invocation
39%inclusion15 decks38 decks
35%synergy
The Meathook Massacre
34%inclusion13 decks38 decks
31%synergy
Starfield of Nyx
34%inclusion13 decks38 decks
30%synergy
Cacophony Unleashed
32%inclusion12 decks38 decks
30%synergy
The Tale of Tamiyo
32%inclusion12 decks38 decks
31%synergy
Touch the Spirit Realm
32%inclusion12 decks38 decks
29%synergy
Darksteel Mutation
29%inclusion11 decks38 decks
23%synergy
Ethereal Armor
29%inclusion11 decks38 decks
24%synergy
Seal of Removal
29%inclusion11 decks38 decks
28%synergy
Imprisoned in the Moon
26%inclusion10 decks38 decks
20%synergy
Timely Ward
26%inclusion10 decks38 decks
21%synergy
Defiled Crypt // Cadaver Lab
26%inclusion10 decks38 decks
26%synergy
Sheltered by Ghosts
26%inclusion10 decks38 decks
24%synergy
Authority of the Consuls
24%inclusion9 decks38 decks
12%synergy
Copy Enchantment
24%inclusion9 decks38 decks
19%synergy
Oubliette
24%inclusion9 decks38 decks
22%synergy
Black Market Connections
24%inclusion9 decks38 decks
9%synergy
Land Tax
24%inclusion9 decks38 decks
18%synergy
Solitary Confinement
24%inclusion9 decks38 decks
22%synergy
Hallowed Haunting
24%inclusion9 decks38 decks
21%synergy
Aura of Silence
24%inclusion9 decks38 decks
20%synergy
Trouble in Pairs
24%inclusion9 decks38 decks
18%synergy
Extravagant Replication
21%inclusion8 decks38 decks
16%synergy
Static Prison
21%inclusion8 decks38 decks
21%synergy
Monologue Tax
21%inclusion8 decks38 decks
15%synergy
Greater Auramancy
21%inclusion8 decks38 decks
17%synergy
Stillness in Motion
20%inclusion7 decks35 decks
20%synergy
Leyline of Anticipation
18%inclusion7 decks38 decks
14%synergy
Phyrexian Arena
18%inclusion7 decks38 decks
4%synergy
Nowhere to Run
18%inclusion7 decks38 decks
17%synergy
One with the Multiverse
16%inclusion6 decks38 decks
11%synergy
Shark Typhoon
16%inclusion6 decks38 decks
10%synergy
Secrets of the Dead
16%inclusion6 decks38 decks
15%synergy
Teval's Judgment
14%inclusion5 decks35 decks
13%synergy
Unable to Scream
13%inclusion5 decks38 decks
12%synergy
Tinybones Joins Up
13%inclusion5 decks38 decks
12%synergy
Utter Insignificance
13%inclusion5 decks38 decks
13%synergy
Chronic Flooding
13%inclusion5 decks38 decks
13%synergy
Virtue of Persistence
13%inclusion5 decks38 decks
11%synergy
Planeswalkers
Ashiok, Dream Render
7.9%inclusion3 decks38 decks
6%synergy
Utility Lands
Bojuka Bog
45%inclusion17 decks38 decks
18%synergy
Cephalid Coliseum
29%inclusion11 decks38 decks
25%synergy
Otawara, Soaring City
26%inclusion10 decks38 decks
7%synergy
Takenuma, Abandoned Mire
13%inclusion5 decks38 decks
7%synergy
Geier Reach Sanitarium
11%inclusion4 decks38 decks
6%synergy
Ishgard, the Holy See
9.1%inclusion3 decks33 decks
6%synergy
Urza's Saga
7.9%inclusion3 decks38 decks
-4%synergy
Rogue's Passage
7.9%inclusion3 decks38 decks
-2%synergy
Eiganjo, Seat of the Empire
7.9%inclusion3 decks38 decks
3%synergy
Urborg, Tomb of Yawgmoth
7.9%inclusion3 decks38 decks
-5%synergy
Adagia, Windswept Bastion
6.7%inclusion2 decks30 decks
4%synergy
Minamo, School at Water's Edge
5.3%inclusion2 decks38 decks
1%synergy
Mystic Sanctuary
5.3%inclusion2 decks38 decks
1%synergy
Nephalia Drownyard
5.3%inclusion2 decks38 decks
5%synergy
Emergence Zone
5.3%inclusion2 decks38 decks
3%synergy
Vault of the Archangel
5.3%inclusion2 decks38 decks
-1%synergy
Reliquary Tower
5.3%inclusion2 decks38 decks
-29%synergy
Temple of the False God
5.3%inclusion2 decks38 decks
-3%synergy
Mana Artifacts
Arcane Signet
87%inclusion33 decks38 decks
-1%synergy
Sol Ring
87%inclusion33 decks38 decks
-3%synergy
Talisman of Progress
61%inclusion23 decks38 decks
17%synergy
Talisman of Dominance
53%inclusion20 decks38 decks
3%synergy
Talisman of Hierarchy
53%inclusion20 decks38 decks
9%synergy
Orzhov Signet
34%inclusion13 decks38 decks
1%synergy
Fellwar Stone
29%inclusion11 decks38 decks
-5%synergy
Azorius Signet
29%inclusion11 decks38 decks
-3%synergy
Dimir Signet
21%inclusion8 decks38 decks
-11%synergy
Chromatic Lantern
11%inclusion4 decks38 decks
-3%synergy
Mind Stone
7.9%inclusion3 decks38 decks
-5%synergy
Bender's Waterskin
7.7%inclusion2 decks26 decks
3%synergy
Lands
Command Tower
100%inclusion38 decks38 decks
7%synergy
Swamp
92%inclusion35 decks38 decks
1%synergy
Plains
92%inclusion35 decks38 decks
1%synergy
Island
92%inclusion35 decks38 decks
-1%synergy
Caves of Koilos
66%inclusion25 decks38 decks
30%synergy
Adarkar Wastes
63%inclusion24 decks38 decks
32%synergy
Exotic Orchard
61%inclusion23 decks38 decks
2%synergy
Underground River
61%inclusion23 decks38 decks
27%synergy
Hallowed Fountain
61%inclusion23 decks38 decks
11%synergy
Watery Grave
61%inclusion23 decks38 decks
10%synergy
Godless Shrine
58%inclusion22 decks38 decks
7%synergy
Flooded Strand
58%inclusion22 decks38 decks
20%synergy
Polluted Delta
53%inclusion20 decks38 decks
15%synergy
Arcane Sanctum
50%inclusion19 decks38 decks
-4%synergy
Undercity Sewers
45%inclusion17 decks38 decks
30%synergy
Meticulous Archive
45%inclusion17 decks38 decks
31%synergy
Marsh Flats
45%inclusion17 decks38 decks
9%synergy
Isolated Chapel
42%inclusion16 decks38 decks
3%synergy
Shadowy Backstreet
39%inclusion15 decks38 decks
27%synergy
Vault of Champions
39%inclusion15 decks38 decks
7%synergy
Morphic Pool
39%inclusion15 decks38 decks
5%synergy
Glacial Fortress
37%inclusion14 decks38 decks
-4%synergy
Sea of Clouds
37%inclusion14 decks38 decks
1%synergy
Raffine's Tower
34%inclusion13 decks38 decks
-7%synergy
Prairie Stream
34%inclusion13 decks38 decks
-7%synergy
Drowned Catacomb
34%inclusion13 decks38 decks
-2%synergy
Sunken Hollow
32%inclusion12 decks38 decks
-8%synergy
Gloomlake Verge
32%inclusion12 decks38 decks
21%synergy
Temple of Silence
32%inclusion12 decks38 decks
12%synergy
Deserted Beach
32%inclusion12 decks38 decks
11%synergy
Terramorphic Expanse
29%inclusion11 decks38 decks
12%synergy
Valgavoth's Lair
29%inclusion11 decks38 decks
26%synergy
Evolving Wilds
29%inclusion11 decks38 decks
4%synergy
Temple of Deceit
26%inclusion10 decks38 decks
8%synergy
Temple of Enlightenment
26%inclusion10 decks38 decks
10%synergy
Obscura Storefront
26%inclusion10 decks38 decks
16%synergy
Floodfarm Verge
26%inclusion10 decks38 decks
15%synergy
Shipwreck Marsh
24%inclusion9 decks38 decks
3%synergy
Contaminated Landscape
21%inclusion8 decks38 decks
7%synergy
Ash Barrens
21%inclusion8 decks38 decks
10%synergy
City of Brass
21%inclusion8 decks38 decks
6%synergy
Tainted Isle
18%inclusion7 decks38 decks
12%synergy
Tundra
18%inclusion7 decks38 decks
2%synergy
Misty Rainforest
18%inclusion7 decks38 decks
7%synergy
Azorius Chancery
18%inclusion7 decks38 decks
4%synergy
Underground Sea
18%inclusion7 decks38 decks
3%synergy
Bleachbone Verge
18%inclusion7 decks38 decks
10%synergy
Tainted Field
18%inclusion7 decks38 decks
11%synergy
Sink into Stupor
18%inclusion7 decks38 decks
6%synergy
Shattered Sanctum
18%inclusion7 decks38 decks
2%synergy
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