The Master of Keys (Commander)

Background image for What if Thassa's Oracle Were Banned?
Harvey McGuinness
Sep 23, 2025
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.
Deck Filters
Cardsphere
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Noggle the Mind
6.0%inclusion69 decks1.14K decks
5%synergy
Twilight Diviner
3.7%inclusion42 decks1.14K decks
2%synergy
Mornsong Aria
3.6%inclusion43 decks1.18K decks
3%synergy
Grave Venerations
1.9%inclusion22 decks1.17K decks
2%synergy
Thirst for Identity
1.6%inclusion18 decks1.14K decks
0%synergy
High Synergy Cards
Ripples of Undeath
61%inclusion4.47K decks7.33K decks
58%synergy
Animate Dead
68%inclusion4.95K decks7.33K decks
58%synergy
Dress Down
58%inclusion4.22K decks7.33K decks
55%synergy
Necromancy
56%inclusion4.09K decks7.33K decks
51%synergy
Inquisitive Glimmer
57%inclusion4.21K decks7.33K decks
50%synergy
Mesa Enchantress
53%inclusion3.87K decks7.33K decks
44%synergy
Entity Tracker
49%inclusion3.62K decks7.33K decks
43%synergy
Starfield Mystic
49%inclusion3.62K decks7.33K decks
43%synergy
Gravebreaker Lamia
43%inclusion3.13K decks7.33K decks
42%synergy
Demon of Fate's Design
46%inclusion3.34K decks7.33K decks
40%synergy
Top Cards
Swords to Plowshares
61%inclusion4.50K decks7.33K decks
-7%synergy
Mystic Remora
59%inclusion4.35K decks7.33K decks
39%synergy
Sevinne's Reclamation
47%inclusion3.45K decks7.33K decks
38%synergy
Mirrormade
46%inclusion3.37K decks7.33K decks
36%synergy
Entomb
44%inclusion3.22K decks7.33K decks
37%synergy
Fear of Sleep Paralysis
42%inclusion3.08K decks7.33K decks
37%synergy
Doomwake Giant
41%inclusion3.02K decks7.33K decks
35%synergy
Blind Obedience
41%inclusion3K decks7.33K decks
29%synergy
Dark Ritual
40%inclusion2.94K decks7.33K decks
21%synergy
Sphere of Safety
40%inclusion2.94K decks7.33K decks
31%synergy
Game Changers
Smothering Tithe
51%inclusion3.72K decks7.33K decks
20%synergy
Rhystic Study
49%inclusion3.55K decks7.33K decks
17%synergy
Enlightened Tutor
38%inclusion2.77K decks7.33K decks
18%synergy
Demonic Tutor
32%inclusion2.37K decks7.33K decks
12%synergy
Vampiric Tutor
30%inclusion2.16K decks7.33K decks
12%synergy
Thassa's Oracle
29%inclusion2.15K decks7.33K decks
20%synergy
Ancient Tomb
26%inclusion1.91K decks7.33K decks
13%synergy
Mana Vault
25%inclusion1.85K decks7.33K decks
16%synergy
Force of Will
25%inclusion1.85K decks7.33K decks
13%synergy
Fierce Guardianship
25%inclusion1.84K decks7.33K decks
5%synergy
Creatures
Scrabbling Skullcrab
40%inclusion2.90K decks7.33K decks
39%synergy
Ondu Spiritdancer
37%inclusion2.70K decks7.33K decks
31%synergy
Overlord of the Floodpits
35%inclusion2.58K decks7.33K decks
32%synergy
Abdel Adrian, Gorion's Ward
35%inclusion2.55K decks7.33K decks
33%synergy
Overlord of the Balemurk
34%inclusion2.50K decks7.33K decks
32%synergy
Esper Sentinel
34%inclusion2.46K decks7.33K decks
6%synergy
Victor, Valgavoth's Seneschal
33%inclusion2.40K decks7.33K decks
31%synergy
Fear of Impostors
30%inclusion2.20K decks7.33K decks
29%synergy
Zur, Eternal Schemer
29%inclusion2.13K decks7.33K decks
26%synergy
Grand Abolisher
28%inclusion2.05K decks7.33K decks
13%synergy
Lotho, Corrupt Shirriff
27%inclusion1.97K decks7.33K decks
10%synergy
Ghostly Dancers
24%inclusion1.77K decks7.33K decks
22%synergy
Valley Floodcaller
23%inclusion1.69K decks7.33K decks
19%synergy
Orcish Bowmasters
23%inclusion1.69K decks7.33K decks
13%synergy
Zur the Enchanter
23%inclusion1.67K decks7.33K decks
18%synergy
Silent Hallcreeper
23%inclusion1.65K decks7.33K decks
18%synergy
Soaring Lightbringer
22%inclusion1.63K decks7.33K decks
17%synergy
Hullbreaker Horror
21%inclusion1.53K decks7.33K decks
15%synergy
Enduring Curiosity
21%inclusion1.52K decks7.33K decks
13%synergy
Moon-Blessed Cleric
20%inclusion1.47K decks7.33K decks
15%synergy
Heliod, the Radiant Dawn
20%inclusion1.47K decks7.33K decks
16%synergy
Ranger-Captain of Eos
20%inclusion1.44K decks7.33K decks
13%synergy
Grim Guardian
20%inclusion1.44K decks7.33K decks
17%synergy
Aminatou, Veil Piercer
19%inclusion1.36K decks7.33K decks
17%synergy
Displacer Kitten
18%inclusion1.35K decks7.33K decks
11%synergy
Archon of Sun's Grace
17%inclusion1.27K decks7.33K decks
13%synergy
Opposition Agent
15%inclusion1.13K decks7.33K decks
7%synergy
Athreos, Shroud-Veiled
14%inclusion992 decks7.33K decks
9%synergy
Ledger Shredder
13%inclusion986 decks7.33K decks
5%synergy
Mindwrack Harpy
13%inclusion983 decks7.33K decks
13%synergy
Lurrus of the Dream-Den
13%inclusion959 decks7.33K decks
12%synergy
Drannith Magistrate
12%inclusion911 decks7.33K decks
5%synergy
Archetype of Imagination
12%inclusion882 decks7.33K decks
7%synergy
Overlord of the Mistmoors
12%inclusion882 decks7.33K decks
10%synergy
Sage of Mysteries
12%inclusion844 decks7.33K decks
11%synergy
Hedron Crab
11%inclusion838 decks7.33K decks
11%synergy
Mockingbird
11%inclusion835 decks7.33K decks
7%synergy
Voice of Victory
11%inclusion468 decks4.23K decks
3%synergy
Alseid of Life's Bounty
11%inclusion807 decks7.33K decks
10%synergy
Ancient Cellarspawn
11%inclusion802 decks7.33K decks
8%synergy
Archivist of Oghma
11%inclusion794 decks7.33K decks
4%synergy
Talion, the Kindly Lord
10%inclusion766 decks7.33K decks
3%synergy
Balemurk Leech
10%inclusion755 decks7.33K decks
10%synergy
Skullsnap Nuisance
10%inclusion743 decks7.33K decks
10%synergy
Spirited Companion
9.5%inclusion694 decks7.33K decks
8%synergy
Auriok Salvagers
9.2%inclusion676 decks7.33K decks
9%synergy
Gremlin Tamer
9.2%inclusion671 decks7.33K decks
8%synergy
Nashi, Searcher in the Dark
8.8%inclusion642 decks7.33K decks
8%synergy
Phyrexian Metamorph
8.7%inclusion635 decks7.33K decks
0%synergy
Wan Shi Tong, Librarian
8.6%inclusion160 decks1.86K decks
3%synergy
Instants
An Offer You Can't Refuse
36%inclusion2.61K decks7.33K decks
8%synergy
Swan Song
32%inclusion2.36K decks7.33K decks
12%synergy
Path to Exile
30%inclusion2.22K decks7.33K decks
-12%synergy
Counterspell
30%inclusion2.17K decks7.33K decks
-12%synergy
Silence
26%inclusion1.94K decks7.33K decks
16%synergy
Arcane Denial
26%inclusion1.93K decks7.33K decks
6%synergy
Cyclonic Rift
24%inclusion1.75K decks7.33K decks
0%synergy
Force of Negation
23%inclusion1.71K decks7.33K decks
12%synergy
Flusterstorm
23%inclusion1.68K decks7.33K decks
15%synergy
Demonic Consultation
22%inclusion1.64K decks7.33K decks
14%synergy
Tainted Pact
22%inclusion1.64K decks7.33K decks
15%synergy
Mindbreak Trap
21%inclusion1.53K decks7.33K decks
14%synergy
Intuition
20%inclusion1.47K decks7.33K decks
18%synergy
Pact of Negation
20%inclusion1.46K decks7.33K decks
12%synergy
Mystical Tutor
20%inclusion1.45K decks7.33K decks
9%synergy
Borne Upon a Wind
19%inclusion1.41K decks7.33K decks
14%synergy
Mental Misstep
19%inclusion1.40K decks7.33K decks
12%synergy
Mana Drain
18%inclusion1.30K decks7.33K decks
0%synergy
Cabal Ritual
17%inclusion1.25K decks7.33K decks
14%synergy
Void Rend
15%inclusion1.12K decks7.33K decks
-19%synergy
Sink into Stupor
15%inclusion1.11K decks7.33K decks
2%synergy
Thirst for Meaning
15%inclusion1.07K decks7.33K decks
13%synergy
Dovin's Veto
15%inclusion1.06K decks7.33K decks
-11%synergy
Otherworldly Gaze
13%inclusion941 decks7.33K decks
11%synergy
Inkshield
13%inclusion933 decks7.33K decks
3%synergy
Frantic Search
13%inclusion926 decks7.33K decks
-5%synergy
Chain of Vapor
11%inclusion814 decks7.33K decks
8%synergy
Brainstorm
10%inclusion743 decks7.33K decks
-7%synergy
Negate
10%inclusion739 decks7.33K decks
-6%synergy
Into the Flood Maw
10%inclusion723 decks7.33K decks
6%synergy
Gifts Ungiven
9.0%inclusion663 decks7.33K decks
7%synergy
Anguished Unmaking
8.3%inclusion607 decks7.33K decks
-17%synergy
Teferi's Protection
6.7%inclusion490 decks7.33K decks
-10%synergy
Fell the Profane
6.5%inclusion473 decks7.33K decks
-2%synergy
Utter End
5.9%inclusion430 decks7.33K decks
-1%synergy
Ad Nauseam
5.8%inclusion425 decks7.33K decks
4%synergy
Deadly Rollick
5.4%inclusion393 decks7.33K decks
-10%synergy
Retraction Helix
5.3%inclusion385 decks7.33K decks
5%synergy
Generous Gift
5.3%inclusion385 decks7.33K decks
-9%synergy
Brain Freeze
5.2%inclusion383 decks7.33K decks
5%synergy
Sorceries
Redress Fate
30%inclusion2.17K decks7.33K decks
24%synergy
Windfall
28%inclusion2.02K decks7.33K decks
14%synergy
Reanimate
27%inclusion1.94K decks7.33K decks
10%synergy
Toxic Deluge
21%inclusion1.52K decks7.33K decks
1%synergy
Imperial Seal
18%inclusion1.33K decks7.33K decks
11%synergy
Singularity Rupture
15%inclusion439 decks2.90K decks
13%synergy
Extinguish All Hope
15%inclusion1.08K decks7.33K decks
13%synergy
Dance of the Manse
14%inclusion1.04K decks7.33K decks
11%synergy
Time Wipe
11%inclusion823 decks7.33K decks
5%synergy
Damn
10%inclusion761 decks7.33K decks
-10%synergy
Demonic Counsel
10%inclusion723 decks7.33K decks
9%synergy
Idyllic Tutor
9.1%inclusion669 decks7.33K decks
5%synergy
Lively Dirge
8.9%inclusion652 decks7.33K decks
8%synergy
Supreme Verdict
8.8%inclusion647 decks7.33K decks
-6%synergy
Glimpse the Unthinkable
8.8%inclusion642 decks7.33K decks
8%synergy
Resurgent Belief
8.6%inclusion629 decks7.33K decks
7%synergy
Beseech the Mirror
8.4%inclusion616 decks7.33K decks
4%synergy
Unmarked Grave
8.2%inclusion598 decks7.33K decks
7%synergy
Ponder
7.8%inclusion568 decks7.33K decks
-1%synergy
Replenish
7.5%inclusion547 decks7.33K decks
6%synergy
Space-Time Anomaly
7.4%inclusion211 decks2.84K decks
6%synergy
Buried Alive
7.1%inclusion517 decks7.33K decks
3%synergy
Mnemonic Betrayal
6.7%inclusion494 decks7.33K decks
4%synergy
Farewell
5.3%inclusion391 decks7.33K decks
-7%synergy
Utility Artifacts
The One Ring
23%inclusion1.70K decks7.33K decks
10%synergy
Wishclaw Talisman
20%inclusion1.49K decks7.33K decks
12%synergy
Mesmeric Orb
15%inclusion1.13K decks7.33K decks
14%synergy
Cloud Key
10%inclusion707 decks7.33K decks
6%synergy
Lightning Greaves
8.1%inclusion595 decks7.33K decks
-14%synergy
Swiftfoot Boots
5.6%inclusion408 decks7.33K decks
-19%synergy
Keys to the House
5.5%inclusion405 decks7.30K decks
5%synergy
Enchantments
Dance of the Dead
39%inclusion2.86K decks7.33K decks
37%synergy
Secret Arcade // Dusty Parlor
37%inclusion2.73K decks7.33K decks
33%synergy
Amphibian Downpour
37%inclusion2.68K decks7.33K decks
32%synergy
Propaganda
35%inclusion2.53K decks7.33K decks
7%synergy
Sigil of the Empty Throne
33%inclusion2.45K decks7.33K decks
28%synergy
Grasp of Fate
30%inclusion2.23K decks7.33K decks
24%synergy
Seal of Cleansing
29%inclusion2.15K decks7.33K decks
28%synergy
Ghostly Prison
29%inclusion2.12K decks7.33K decks
7%synergy
Cemetery Tampering
29%inclusion2.09K decks7.33K decks
28%synergy
Monologue Tax
26%inclusion1.87K decks7.33K decks
19%synergy
Starfield of Nyx
25%inclusion1.85K decks7.33K decks
21%synergy
Necropotence
24%inclusion1.75K decks7.33K decks
17%synergy
Estrid's Invocation
24%inclusion1.73K decks7.33K decks
19%synergy
The Meathook Massacre
21%inclusion1.57K decks7.33K decks
18%synergy
Cacophony Unleashed
21%inclusion1.56K decks7.33K decks
20%synergy
Touch the Spirit Realm
21%inclusion1.54K decks7.33K decks
19%synergy
Shark Typhoon
21%inclusion1.51K decks7.33K decks
15%synergy
Defiled Crypt // Cadaver Lab
20%inclusion1.50K decks7.30K decks
20%synergy
Darksteel Mutation
20%inclusion1.49K decks7.33K decks
14%synergy
Tinybones Joins Up
19%inclusion1.41K decks7.33K decks
18%synergy
Stillness in Motion
18%inclusion748 decks4.12K decks
18%synergy
All That Glitters
17%inclusion1.24K decks7.33K decks
8%synergy
Polluted Cistern // Dim Oubliette
17%inclusion1.22K decks7.32K decks
16%synergy
Extravagant Replication
16%inclusion1.20K decks7.33K decks
11%synergy
Static Prison
16%inclusion1.20K decks7.33K decks
16%synergy
Copy Enchantment
16%inclusion1.20K decks7.33K decks
12%synergy
Timely Ward
16%inclusion1.19K decks7.33K decks
11%synergy
The Tale of Tamiyo
16%inclusion1.18K decks7.33K decks
16%synergy
Seal of Removal
16%inclusion1.15K decks7.33K decks
15%synergy
Ethereal Armor
16%inclusion1.15K decks7.33K decks
11%synergy
Phyrexian Arena
16%inclusion1.14K decks7.33K decks
2%synergy
Black Market Connections
15%inclusion1.09K decks7.33K decks
0%synergy
Greater Auramancy
15%inclusion1.08K decks7.33K decks
10%synergy
Out of the Tombs
15%inclusion1.08K decks7.33K decks
14%synergy
Imprisoned in the Moon
15%inclusion1.07K decks7.33K decks
8%synergy
Hallowed Haunting
14%inclusion1K decks7.33K decks
11%synergy
Bottomless Pool // Locker Room
14%inclusion1K decks7.33K decks
12%synergy
Restricted Office // Lecture Hall
13%inclusion973 decks7.33K decks
11%synergy
Leyline of Anticipation
13%inclusion961 decks7.33K decks
9%synergy
The Eldest Reborn
13%inclusion957 decks7.33K decks
11%synergy
Mirror Room // Fractured Realm
13%inclusion940 decks7.33K decks
11%synergy
Cramped Vents // Access Maze
13%inclusion931 decks7.33K decks
10%synergy
Trouble in Pairs
12%inclusion907 decks7.33K decks
7%synergy
Court of Cunning
12%inclusion888 decks7.33K decks
11%synergy
Sheltered by Ghosts
11%inclusion827 decks7.33K decks
9%synergy
Copy Artifact
11%inclusion798 decks7.33K decks
10%synergy
Central Elevator // Promising Stairs
11%inclusion787 decks7.33K decks
10%synergy
Dazzling Theater // Prop Room
10%inclusion763 decks7.30K decks
9%synergy
One with the Multiverse
10%inclusion759 decks7.33K decks
6%synergy
Teval's Judgment
10%inclusion432 decks4.20K decks
9%synergy
Battles
Invasion of Theros
6.0%inclusion442 decks7.33K decks
4%synergy
Planeswalkers
Teferi, Time Raveler
18%inclusion1.31K decks7.33K decks
10%synergy
Utility Lands
Hall of Heliod's Generosity
48%inclusion3.52K decks7.33K decks
35%synergy
Otawara, Soaring City
33%inclusion2.43K decks7.33K decks
14%synergy
Bojuka Bog
32%inclusion2.33K decks7.33K decks
5%synergy
Urza's Saga
15%inclusion1.11K decks7.33K decks
3%synergy
Cephalid Coliseum
14%inclusion1.04K decks7.33K decks
11%synergy
Reliquary Tower
13%inclusion950 decks7.33K decks
-21%synergy
Takenuma, Abandoned Mire
13%inclusion924 decks7.33K decks
6%synergy
Halimar Depths
10%inclusion745 decks7.33K decks
5%synergy
Urborg, Tomb of Yawgmoth
10%inclusion711 decks7.33K decks
-3%synergy
Emergence Zone
9.5%inclusion695 decks7.33K decks
7%synergy
Serra's Sanctum
9.0%inclusion661 decks7.33K decks
7%synergy
Minamo, School at Water's Edge
8.7%inclusion634 decks7.33K decks
5%synergy
Mana Artifacts
Sol Ring
91%inclusion6.63K decks7.33K decks
1%synergy
Arcane Signet
90%inclusion6.62K decks7.33K decks
2%synergy
Talisman of Dominance
58%inclusion4.24K decks7.33K decks
8%synergy
Talisman of Progress
50%inclusion3.70K decks7.33K decks
7%synergy
Talisman of Hierarchy
44%inclusion3.22K decks7.33K decks
0%synergy
Fellwar Stone
43%inclusion3.17K decks7.33K decks
10%synergy
Azorius Signet
34%inclusion2.47K decks7.33K decks
3%synergy
Orzhov Signet
32%inclusion2.36K decks7.33K decks
-1%synergy
Lotus Petal
26%inclusion1.91K decks7.33K decks
16%synergy
Dimir Signet
24%inclusion1.76K decks7.33K decks
-7%synergy
Chrome Mox
23%inclusion1.70K decks7.33K decks
14%synergy
Mox Diamond
19%inclusion1.43K decks7.33K decks
12%synergy
Mox Opal
19%inclusion1.39K decks7.33K decks
10%synergy
Lion's Eye Diamond
15%inclusion1.09K decks7.33K decks
13%synergy
Mind Stone
15%inclusion1.07K decks7.33K decks
2%synergy
Commander's Sphere
12%inclusion881 decks7.33K decks
-6%synergy
Mox Amber
10%inclusion764 decks7.33K decks
4%synergy
Grim Monolith
8.6%inclusion633 decks7.33K decks
5%synergy
Thought Vessel
6.4%inclusion468 decks7.33K decks
-18%synergy
Chromatic Lantern
5.9%inclusion429 decks7.33K decks
-7%synergy
Lands
Command Tower
94%inclusion6.87K decks7.33K decks
1%synergy
Island
85%inclusion6.25K decks7.33K decks
-8%synergy
Swamp
83%inclusion6.07K decks7.33K decks
-9%synergy
Plains
81%inclusion5.96K decks7.33K decks
-10%synergy
Godless Shrine
59%inclusion4.30K decks7.33K decks
8%synergy
Watery Grave
58%inclusion4.28K decks7.33K decks
8%synergy
Hallowed Fountain
58%inclusion4.27K decks7.33K decks
8%synergy
Exotic Orchard
56%inclusion4.07K decks7.33K decks
-3%synergy
Flooded Strand
52%inclusion3.80K decks7.33K decks
14%synergy
Polluted Delta
52%inclusion3.78K decks7.33K decks
14%synergy
Marsh Flats
49%inclusion3.57K decks7.33K decks
13%synergy
Arcane Sanctum
47%inclusion3.41K decks7.33K decks
-8%synergy
Caves of Koilos
45%inclusion3.27K decks7.33K decks
9%synergy
Adarkar Wastes
44%inclusion3.21K decks7.33K decks
12%synergy
Underground River
42%inclusion3.06K decks7.33K decks
8%synergy
Morphic Pool
40%inclusion2.94K decks7.33K decks
6%synergy
Sea of Clouds
39%inclusion2.88K decks7.33K decks
4%synergy
Vault of Champions
36%inclusion2.67K decks7.33K decks
4%synergy
Undercity Sewers
35%inclusion2.54K decks7.33K decks
20%synergy
Raffine's Tower
34%inclusion2.52K decks7.33K decks
-7%synergy
Glacial Fortress
30%inclusion2.19K decks7.33K decks
-12%synergy
Isolated Chapel
29%inclusion2.09K decks7.33K decks
-12%synergy
City of Brass
28%inclusion2.04K decks7.33K decks
13%synergy
Meticulous Archive
28%inclusion2.03K decks7.33K decks
14%synergy
Scrubland
27%inclusion1.98K decks7.33K decks
11%synergy
Tundra
27%inclusion1.97K decks7.33K decks
11%synergy
Underground Sea
26%inclusion1.94K decks7.33K decks
11%synergy
Shadowy Backstreet
26%inclusion1.90K decks7.33K decks
13%synergy
Mana Confluence
26%inclusion1.90K decks7.33K decks
12%synergy
Bloodstained Mire
25%inclusion1.85K decks7.33K decks
14%synergy
Misty Rainforest
25%inclusion1.83K decks7.33K decks
14%synergy
Drowned Catacomb
25%inclusion1.81K decks7.33K decks
-12%synergy
Prairie Stream
23%inclusion1.71K decks7.33K decks
-17%synergy
Verdant Catacombs
23%inclusion1.71K decks7.33K decks
13%synergy
Scalding Tarn
23%inclusion1.65K decks7.33K decks
12%synergy
Valgavoth's Lair
22%inclusion1.65K decks7.33K decks
20%synergy
Evolving Wilds
22%inclusion1.62K decks7.33K decks
-3%synergy
Sunken Hollow
22%inclusion1.61K decks7.33K decks
-18%synergy
Windswept Heath
22%inclusion1.60K decks7.33K decks
12%synergy
Gemstone Caverns
21%inclusion1.57K decks7.33K decks
14%synergy
Terramorphic Expanse
21%inclusion1.56K decks7.33K decks
5%synergy
Temple of Enlightenment
21%inclusion1.53K decks7.33K decks
5%synergy
Temple of Silence
20%inclusion1.50K decks7.33K decks
2%synergy
Arid Mesa
20%inclusion1.45K decks7.33K decks
10%synergy
Temple of Deceit
20%inclusion1.44K decks7.33K decks
2%synergy
Obscura Storefront
19%inclusion1.41K decks7.33K decks
10%synergy
Tainted Field
18%inclusion1.35K decks7.33K decks
12%synergy
Tainted Isle
18%inclusion1.33K decks7.33K decks
12%synergy
Azorius Chancery
18%inclusion1.32K decks7.33K decks
4%synergy
Dimir Aqueduct
17%inclusion1.27K decks7.33K decks
4%synergy