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
4.5%inclusion25 decks554 decks
4%synergy
Twilight Diviner
2.9%inclusion16 decks554 decks
2%synergy
Mornsong Aria
2.8%inclusion17 decks600 decks
2%synergy
Thirst for Identity
1.3%inclusion7 decks554 decks
0%synergy
Grave Venerations
0.8%inclusion5 decks589 decks
1%synergy
High Synergy Cards
Animate Dead
68%inclusion4.69K decks6.89K decks
58%synergy
Ripples of Undeath
61%inclusion4.19K decks6.89K decks
58%synergy
Dress Down
58%inclusion3.99K decks6.89K decks
56%synergy
Necromancy
56%inclusion3.88K decks6.89K decks
52%synergy
Inquisitive Glimmer
57%inclusion3.91K decks6.89K decks
49%synergy
Mesa Enchantress
52%inclusion3.60K decks6.89K decks
43%synergy
Entity Tracker
49%inclusion3.37K decks6.89K decks
43%synergy
Starfield Mystic
49%inclusion3.38K decks6.89K decks
42%synergy
Gravebreaker Lamia
42%inclusion2.89K decks6.89K decks
41%synergy
Demon of Fate's Design
45%inclusion3.10K decks6.89K decks
40%synergy
Top Cards
Swords to Plowshares
62%inclusion4.27K decks6.89K decks
-6%synergy
Mystic Remora
60%inclusion4.13K decks6.89K decks
39%synergy
Sevinne's Reclamation
47%inclusion3.25K decks6.89K decks
38%synergy
Mirrormade
46%inclusion3.16K decks6.89K decks
36%synergy
Entomb
44%inclusion3.06K decks6.89K decks
38%synergy
Fear of Sleep Paralysis
42%inclusion2.87K decks6.89K decks
36%synergy
Blind Obedience
42%inclusion2.86K decks6.89K decks
29%synergy
Doomwake Giant
41%inclusion2.83K decks6.89K decks
35%synergy
Dark Ritual
41%inclusion2.80K decks6.89K decks
21%synergy
Sphere of Safety
40%inclusion2.74K decks6.89K decks
30%synergy
Game Changers
Smothering Tithe
52%inclusion3.55K decks6.89K decks
20%synergy
Rhystic Study
49%inclusion3.40K decks6.89K decks
17%synergy
Enlightened Tutor
39%inclusion2.67K decks6.89K decks
19%synergy
Demonic Tutor
33%inclusion2.27K decks6.89K decks
12%synergy
Vampiric Tutor
30%inclusion2.09K decks6.89K decks
13%synergy
Thassa's Oracle
30%inclusion2.08K decks6.89K decks
21%synergy
Ancient Tomb
27%inclusion1.85K decks6.89K decks
14%synergy
Mana Vault
26%inclusion1.80K decks6.89K decks
17%synergy
Force of Will
26%inclusion1.80K decks6.89K decks
13%synergy
Fierce Guardianship
26%inclusion1.79K decks6.89K decks
5%synergy
Creatures
Scrabbling Skullcrab
39%inclusion2.68K decks6.89K decks
38%synergy
Ondu Spiritdancer
37%inclusion2.52K decks6.89K decks
30%synergy
Abdel Adrian, Gorion's Ward
36%inclusion2.45K decks6.89K decks
34%synergy
Overlord of the Floodpits
35%inclusion2.39K decks6.89K decks
31%synergy
Esper Sentinel
34%inclusion2.35K decks6.89K decks
7%synergy
Overlord of the Balemurk
34%inclusion2.32K decks6.89K decks
32%synergy
Victor, Valgavoth's Seneschal
32%inclusion2.22K decks6.89K decks
30%synergy
Fear of Impostors
30%inclusion2.04K decks6.89K decks
28%synergy
Grand Abolisher
29%inclusion1.98K decks6.89K decks
14%synergy
Zur, Eternal Schemer
29%inclusion1.97K decks6.89K decks
25%synergy
Lotho, Corrupt Shirriff
27%inclusion1.89K decks6.89K decks
11%synergy
Ghostly Dancers
24%inclusion1.65K decks6.89K decks
21%synergy
Orcish Bowmasters
24%inclusion1.64K decks6.89K decks
13%synergy
Valley Floodcaller
24%inclusion1.64K decks6.89K decks
20%synergy
Zur the Enchanter
22%inclusion1.54K decks6.89K decks
17%synergy
Silent Hallcreeper
22%inclusion1.53K decks6.89K decks
18%synergy
Soaring Lightbringer
22%inclusion1.53K decks6.89K decks
17%synergy
Hullbreaker Horror
21%inclusion1.48K decks6.89K decks
15%synergy
Enduring Curiosity
21%inclusion1.44K decks6.89K decks
13%synergy
Ranger-Captain of Eos
20%inclusion1.41K decks6.89K decks
14%synergy
Heliod, the Radiant Dawn
20%inclusion1.38K decks6.89K decks
16%synergy
Moon-Blessed Cleric
20%inclusion1.38K decks6.89K decks
15%synergy
Grim Guardian
19%inclusion1.34K decks6.89K decks
17%synergy
Displacer Kitten
19%inclusion1.31K decks6.89K decks
12%synergy
Aminatou, Veil Piercer
19%inclusion1.28K decks6.89K decks
17%synergy
Archon of Sun's Grace
17%inclusion1.19K decks6.89K decks
13%synergy
Opposition Agent
16%inclusion1.10K decks6.89K decks
7%synergy
Ledger Shredder
14%inclusion949 decks6.89K decks
5%synergy
Athreos, Shroud-Veiled
14%inclusion939 decks6.89K decks
9%synergy
Lurrus of the Dream-Den
13%inclusion928 decks6.89K decks
12%synergy
Mindwrack Harpy
13%inclusion923 decks6.89K decks
13%synergy
Drannith Magistrate
13%inclusion892 decks6.89K decks
5%synergy
Archetype of Imagination
12%inclusion829 decks6.89K decks
7%synergy
Overlord of the Mistmoors
12%inclusion824 decks6.89K decks
10%synergy
Mockingbird
12%inclusion796 decks6.89K decks
7%synergy
Voice of Victory
11%inclusion431 decks3.78K decks
3%synergy
Ancient Cellarspawn
11%inclusion775 decks6.89K decks
8%synergy
Archivist of Oghma
11%inclusion774 decks6.89K decks
4%synergy
Sage of Mysteries
11%inclusion772 decks6.89K decks
11%synergy
Hedron Crab
11%inclusion771 decks6.89K decks
11%synergy
Alseid of Life's Bounty
11%inclusion758 decks6.89K decks
10%synergy
Talion, the Kindly Lord
11%inclusion753 decks6.89K decks
3%synergy
Balemurk Leech
10%inclusion704 decks6.89K decks
10%synergy
Skullsnap Nuisance
10%inclusion698 decks6.89K decks
10%synergy
Spirited Companion
10%inclusion658 decks6.89K decks
8%synergy
Auriok Salvagers
10%inclusion655 decks6.89K decks
9%synergy
Gremlin Tamer
9.1%inclusion628 decks6.89K decks
8%synergy
Phyrexian Metamorph
9.1%inclusion625 decks6.89K decks
0%synergy
Nashi, Searcher in the Dark
8.9%inclusion611 decks6.89K decks
8%synergy
Wan Shi Tong, Librarian
8.0%inclusion109 decks1.36K decks
3%synergy
Instants
An Offer You Can't Refuse
36%inclusion2.45K decks6.89K decks
9%synergy
Swan Song
33%inclusion2.24K decks6.89K decks
13%synergy
Path to Exile
30%inclusion2.08K decks6.89K decks
-12%synergy
Counterspell
29%inclusion2K decks6.89K decks
-12%synergy
Silence
27%inclusion1.87K decks6.89K decks
17%synergy
Arcane Denial
26%inclusion1.79K decks6.89K decks
6%synergy
Cyclonic Rift
25%inclusion1.70K decks6.89K decks
1%synergy
Force of Negation
24%inclusion1.66K decks6.89K decks
12%synergy
Flusterstorm
24%inclusion1.63K decks6.89K decks
15%synergy
Tainted Pact
23%inclusion1.60K decks6.89K decks
16%synergy
Demonic Consultation
23%inclusion1.59K decks6.89K decks
15%synergy
Mindbreak Trap
21%inclusion1.48K decks6.89K decks
15%synergy
Intuition
21%inclusion1.43K decks6.89K decks
19%synergy
Pact of Negation
21%inclusion1.42K decks6.89K decks
13%synergy
Mystical Tutor
21%inclusion1.41K decks6.89K decks
9%synergy
Borne Upon a Wind
20%inclusion1.36K decks6.89K decks
15%synergy
Mental Misstep
20%inclusion1.35K decks6.89K decks
13%synergy
Mana Drain
18%inclusion1.25K decks6.89K decks
1%synergy
Cabal Ritual
17%inclusion1.20K decks6.89K decks
14%synergy
Sink into Stupor
15%inclusion1.04K decks6.89K decks
2%synergy
Void Rend
15%inclusion1.03K decks6.89K decks
-19%synergy
Thirst for Meaning
15%inclusion1K decks6.89K decks
13%synergy
Dovin's Veto
14%inclusion991 decks6.89K decks
-11%synergy
Otherworldly Gaze
13%inclusion877 decks6.89K decks
11%synergy
Inkshield
13%inclusion871 decks6.89K decks
3%synergy
Frantic Search
12%inclusion850 decks6.89K decks
-5%synergy
Chain of Vapor
11%inclusion787 decks6.89K decks
8%synergy
Brainstorm
10%inclusion704 decks6.89K decks
-7%synergy
Into the Flood Maw
10%inclusion691 decks6.89K decks
6%synergy
Negate
10%inclusion691 decks6.89K decks
-6%synergy
Gifts Ungiven
8.8%inclusion608 decks6.89K decks
6%synergy
Anguished Unmaking
8.3%inclusion571 decks6.89K decks
-17%synergy
Teferi's Protection
6.9%inclusion477 decks6.89K decks
-10%synergy
Fell the Profane
6.4%inclusion442 decks6.89K decks
-2%synergy
Ad Nauseam
5.9%inclusion408 decks6.89K decks
4%synergy
Utter End
5.8%inclusion400 decks6.89K decks
-1%synergy
Retraction Helix
5.4%inclusion374 decks6.89K decks
5%synergy
Deadly Rollick
5.4%inclusion370 decks6.89K decks
-9%synergy
Brain Freeze
5.4%inclusion370 decks6.89K decks
5%synergy
Generous Gift
5.4%inclusion370 decks6.89K decks
-9%synergy
Sorceries
Redress Fate
30%inclusion2.04K decks6.89K decks
24%synergy
Windfall
28%inclusion1.90K decks6.89K decks
14%synergy
Reanimate
26%inclusion1.81K decks6.89K decks
10%synergy
Toxic Deluge
22%inclusion1.49K decks6.89K decks
2%synergy
Imperial Seal
19%inclusion1.29K decks6.89K decks
11%synergy
Singularity Rupture
15%inclusion359 decks2.43K decks
12%synergy
Extinguish All Hope
14%inclusion993 decks6.89K decks
13%synergy
Dance of the Manse
14%inclusion976 decks6.89K decks
11%synergy
Time Wipe
11%inclusion790 decks6.89K decks
5%synergy
Damn
10%inclusion722 decks6.89K decks
-10%synergy
Demonic Counsel
10%inclusion701 decks6.89K decks
9%synergy
Idyllic Tutor
9.2%inclusion632 decks6.89K decks
5%synergy
Lively Dirge
9.1%inclusion625 decks6.89K decks
8%synergy
Supreme Verdict
9.0%inclusion617 decks6.89K decks
-6%synergy
Resurgent Belief
8.6%inclusion591 decks6.89K decks
6%synergy
Beseech the Mirror
8.5%inclusion587 decks6.89K decks
5%synergy
Glimpse the Unthinkable
8.4%inclusion579 decks6.89K decks
8%synergy
Unmarked Grave
8.4%inclusion576 decks6.89K decks
7%synergy
Ponder
7.8%inclusion537 decks6.89K decks
-1%synergy
Space-Time Anomaly
7.5%inclusion177 decks2.37K decks
6%synergy
Replenish
7.4%inclusion512 decks6.89K decks
6%synergy
Buried Alive
7.1%inclusion487 decks6.89K decks
3%synergy
Mnemonic Betrayal
6.9%inclusion473 decks6.89K decks
4%synergy
Farewell
5.4%inclusion371 decks6.89K decks
-8%synergy
Utility Artifacts
The One Ring
24%inclusion1.68K decks6.89K decks
11%synergy
Wishclaw Talisman
21%inclusion1.43K decks6.89K decks
13%synergy
Mesmeric Orb
15%inclusion1.06K decks6.89K decks
14%synergy
Cloud Key
10%inclusion655 decks6.89K decks
6%synergy
Lightning Greaves
8.2%inclusion563 decks6.89K decks
-14%synergy
Swiftfoot Boots
5.5%inclusion376 decks6.89K decks
-19%synergy
Keys to the House
5.4%inclusion373 decks6.86K decks
5%synergy
Enchantments
Dance of the Dead
40%inclusion2.72K decks6.89K decks
37%synergy
Secret Arcade // Dusty Parlor
37%inclusion2.54K decks6.89K decks
32%synergy
Amphibian Downpour
36%inclusion2.49K decks6.89K decks
32%synergy
Propaganda
34%inclusion2.35K decks6.89K decks
7%synergy
Sigil of the Empty Throne
33%inclusion2.29K decks6.89K decks
27%synergy
Grasp of Fate
30%inclusion2.06K decks6.89K decks
24%synergy
Seal of Cleansing
29%inclusion1.99K decks6.89K decks
27%synergy
Ghostly Prison
29%inclusion1.98K decks6.89K decks
7%synergy
Cemetery Tampering
28%inclusion1.92K decks6.89K decks
27%synergy
Monologue Tax
25%inclusion1.74K decks6.89K decks
19%synergy
Starfield of Nyx
25%inclusion1.73K decks6.89K decks
21%synergy
Necropotence
24%inclusion1.69K decks6.89K decks
18%synergy
Estrid's Invocation
23%inclusion1.58K decks6.89K decks
18%synergy
The Meathook Massacre
22%inclusion1.49K decks6.89K decks
18%synergy
Touch the Spirit Realm
21%inclusion1.47K decks6.89K decks
19%synergy
Cacophony Unleashed
21%inclusion1.44K decks6.89K decks
19%synergy
Shark Typhoon
21%inclusion1.42K decks6.89K decks
15%synergy
Defiled Crypt // Cadaver Lab
20%inclusion1.40K decks6.86K decks
20%synergy
Darksteel Mutation
20%inclusion1.39K decks6.89K decks
14%synergy
Tinybones Joins Up
20%inclusion1.35K decks6.89K decks
18%synergy
Stillness in Motion
18%inclusion648 decks3.67K decks
17%synergy
All That Glitters
17%inclusion1.16K decks6.89K decks
8%synergy
Static Prison
17%inclusion1.15K decks6.89K decks
16%synergy
Polluted Cistern // Dim Oubliette
16%inclusion1.13K decks6.88K decks
16%synergy
Extravagant Replication
16%inclusion1.13K decks6.89K decks
11%synergy
Timely Ward
16%inclusion1.12K decks6.89K decks
11%synergy
The Tale of Tamiyo
16%inclusion1.09K decks6.89K decks
15%synergy
Seal of Removal
16%inclusion1.08K decks6.89K decks
15%synergy
Copy Enchantment
16%inclusion1.08K decks6.89K decks
11%synergy
Phyrexian Arena
16%inclusion1.07K decks6.89K decks
2%synergy
Ethereal Armor
15%inclusion1.05K decks6.89K decks
11%synergy
Black Market Connections
15%inclusion1.02K decks6.89K decks
1%synergy
Out of the Tombs
15%inclusion1.02K decks6.89K decks
14%synergy
Greater Auramancy
15%inclusion1.02K decks6.89K decks
10%synergy
Imprisoned in the Moon
14%inclusion990 decks6.89K decks
8%synergy
Bottomless Pool // Locker Room
14%inclusion934 decks6.89K decks
12%synergy
Hallowed Haunting
13%inclusion923 decks6.89K decks
11%synergy
Leyline of Anticipation
13%inclusion908 decks6.89K decks
9%synergy
The Eldest Reborn
13%inclusion906 decks6.89K decks
11%synergy
Restricted Office // Lecture Hall
13%inclusion893 decks6.89K decks
11%synergy
Mirror Room // Fractured Realm
13%inclusion878 decks6.89K decks
10%synergy
Cramped Vents // Access Maze
13%inclusion871 decks6.89K decks
10%synergy
Trouble in Pairs
13%inclusion867 decks6.89K decks
7%synergy
Court of Cunning
12%inclusion827 decks6.89K decks
11%synergy
Copy Artifact
11%inclusion777 decks6.89K decks
10%synergy
Sheltered by Ghosts
11%inclusion774 decks6.89K decks
9%synergy
Central Elevator // Promising Stairs
11%inclusion727 decks6.89K decks
10%synergy
Dazzling Theater // Prop Room
11%inclusion722 decks6.86K decks
9%synergy
One with the Multiverse
10%inclusion716 decks6.89K decks
6%synergy
Teval's Judgment
10%inclusion388 decks3.75K decks
10%synergy
Battles
Invasion of Theros
6.1%inclusion417 decks6.89K decks
4%synergy
Planeswalkers
Teferi, Time Raveler
19%inclusion1.28K decks6.89K decks
10%synergy
Utility Lands
Hall of Heliod's Generosity
48%inclusion3.30K decks6.89K decks
35%synergy
Otawara, Soaring City
34%inclusion2.31K decks6.89K decks
14%synergy
Bojuka Bog
32%inclusion2.18K decks6.89K decks
4%synergy
Urza's Saga
15%inclusion1.06K decks6.89K decks
3%synergy
Cephalid Coliseum
14%inclusion982 decks6.89K decks
11%synergy
Reliquary Tower
13%inclusion899 decks6.89K decks
-21%synergy
Takenuma, Abandoned Mire
13%inclusion875 decks6.89K decks
6%synergy
Halimar Depths
10%inclusion705 decks6.89K decks
5%synergy
Emergence Zone
10%inclusion666 decks6.89K decks
8%synergy
Urborg, Tomb of Yawgmoth
10%inclusion666 decks6.89K decks
-3%synergy
Serra's Sanctum
9.1%inclusion626 decks6.89K decks
7%synergy
Minamo, School at Water's Edge
9.0%inclusion622 decks6.89K decks
5%synergy
Mana Artifacts
Sol Ring
91%inclusion6.25K decks6.89K decks
1%synergy
Arcane Signet
90%inclusion6.22K decks6.89K decks
2%synergy
Talisman of Dominance
58%inclusion4.01K decks6.89K decks
9%synergy
Talisman of Progress
51%inclusion3.48K decks6.89K decks
7%synergy
Talisman of Hierarchy
44%inclusion3.02K decks6.89K decks
0%synergy
Fellwar Stone
44%inclusion3K decks6.89K decks
10%synergy
Azorius Signet
34%inclusion2.31K decks6.89K decks
2%synergy
Orzhov Signet
32%inclusion2.20K decks6.89K decks
-2%synergy
Lotus Petal
27%inclusion1.84K decks6.89K decks
16%synergy
Chrome Mox
24%inclusion1.65K decks6.89K decks
14%synergy
Dimir Signet
24%inclusion1.64K decks6.89K decks
-8%synergy
Mox Diamond
20%inclusion1.39K decks6.89K decks
13%synergy
Mox Opal
20%inclusion1.35K decks6.89K decks
11%synergy
Lion's Eye Diamond
15%inclusion1.06K decks6.89K decks
13%synergy
Mind Stone
15%inclusion1.02K decks6.89K decks
2%synergy
Commander's Sphere
12%inclusion827 decks6.89K decks
-7%synergy
Mox Amber
11%inclusion748 decks6.89K decks
5%synergy
Grim Monolith
8.9%inclusion611 decks6.89K decks
5%synergy
Thought Vessel
6.5%inclusion446 decks6.89K decks
-18%synergy
Chromatic Lantern
6.0%inclusion411 decks6.89K decks
-7%synergy
Lands
Command Tower
94%inclusion6.46K decks6.89K decks
1%synergy
Island
85%inclusion5.86K decks6.89K decks
-8%synergy
Swamp
83%inclusion5.69K decks6.89K decks
-9%synergy
Plains
81%inclusion5.57K decks6.89K decks
-11%synergy
Watery Grave
59%inclusion4.03K decks6.89K decks
8%synergy
Godless Shrine
58%inclusion4.02K decks6.89K decks
8%synergy
Hallowed Fountain
58%inclusion4K decks6.89K decks
9%synergy
Exotic Orchard
55%inclusion3.81K decks6.89K decks
-3%synergy
Flooded Strand
52%inclusion3.60K decks6.89K decks
14%synergy
Polluted Delta
52%inclusion3.58K decks6.89K decks
14%synergy
Marsh Flats
49%inclusion3.39K decks6.89K decks
13%synergy
Arcane Sanctum
46%inclusion3.18K decks6.89K decks
-8%synergy
Caves of Koilos
45%inclusion3.07K decks6.89K decks
9%synergy
Adarkar Wastes
44%inclusion3K decks6.89K decks
12%synergy
Underground River
42%inclusion2.86K decks6.89K decks
8%synergy
Morphic Pool
40%inclusion2.78K decks6.89K decks
6%synergy
Sea of Clouds
40%inclusion2.73K decks6.89K decks
4%synergy
Vault of Champions
37%inclusion2.52K decks6.89K decks
4%synergy
Undercity Sewers
35%inclusion2.40K decks6.89K decks
21%synergy
Raffine's Tower
34%inclusion2.34K decks6.89K decks
-7%synergy
Glacial Fortress
29%inclusion2.02K decks6.89K decks
-12%synergy
City of Brass
28%inclusion1.95K decks6.89K decks
13%synergy
Isolated Chapel
28%inclusion1.93K decks6.89K decks
-12%synergy
Meticulous Archive
28%inclusion1.90K decks6.89K decks
14%synergy
Scrubland
28%inclusion1.90K decks6.89K decks
12%synergy
Tundra
27%inclusion1.89K decks6.89K decks
12%synergy
Underground Sea
27%inclusion1.86K decks6.89K decks
11%synergy
Mana Confluence
26%inclusion1.82K decks6.89K decks
13%synergy
Bloodstained Mire
26%inclusion1.78K decks6.89K decks
15%synergy
Shadowy Backstreet
26%inclusion1.77K decks6.89K decks
13%synergy
Misty Rainforest
26%inclusion1.76K decks6.89K decks
14%synergy
Drowned Catacomb
24%inclusion1.67K decks6.89K decks
-12%synergy
Verdant Catacombs
24%inclusion1.65K decks6.89K decks
14%synergy
Scalding Tarn
23%inclusion1.59K decks6.89K decks
12%synergy
Prairie Stream
23%inclusion1.59K decks6.89K decks
-18%synergy
Valgavoth's Lair
22%inclusion1.55K decks6.89K decks
20%synergy
Windswept Heath
22%inclusion1.54K decks6.89K decks
13%synergy
Evolving Wilds
22%inclusion1.53K decks6.89K decks
-3%synergy
Gemstone Caverns
22%inclusion1.53K decks6.89K decks
14%synergy
Sunken Hollow
22%inclusion1.49K decks6.89K decks
-18%synergy
Terramorphic Expanse
21%inclusion1.47K decks6.89K decks
5%synergy
Temple of Enlightenment
21%inclusion1.45K decks6.89K decks
5%synergy
Temple of Silence
21%inclusion1.42K decks6.89K decks
1%synergy
Arid Mesa
20%inclusion1.39K decks6.89K decks
10%synergy
Temple of Deceit
20%inclusion1.38K decks6.89K decks
2%synergy
Obscura Storefront
19%inclusion1.34K decks6.89K decks
9%synergy
Tainted Field
19%inclusion1.28K decks6.89K decks
12%synergy
Azorius Chancery
18%inclusion1.25K decks6.89K decks
4%synergy
Tainted Isle
18%inclusion1.25K decks6.89K decks
12%synergy
Dimir Aqueduct
18%inclusion1.21K decks6.89K decks
4%synergy