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%inclusion65 decks1.09K decks
5%synergy
Twilight Diviner
3.8%inclusion41 decks1.09K decks
2%synergy
Mornsong Aria
3.4%inclusion39 decks1.13K decks
3%synergy
Grave Venerations
1.8%inclusion20 decks1.12K decks
1%synergy
Thirst for Identity
1.6%inclusion17 decks1.09K decks
0%synergy
High Synergy Cards
Ripples of Undeath
61%inclusion4.44K decks7.29K decks
58%synergy
Animate Dead
68%inclusion4.93K decks7.29K decks
58%synergy
Dress Down
58%inclusion4.20K decks7.29K decks
55%synergy
Necromancy
56%inclusion4.07K decks7.29K decks
51%synergy
Inquisitive Glimmer
57%inclusion4.18K decks7.29K decks
50%synergy
Mesa Enchantress
53%inclusion3.84K decks7.29K decks
44%synergy
Entity Tracker
49%inclusion3.60K decks7.29K decks
43%synergy
Starfield Mystic
49%inclusion3.59K decks7.29K decks
43%synergy
Gravebreaker Lamia
43%inclusion3.11K decks7.29K decks
42%synergy
Demon of Fate's Design
45%inclusion3.31K decks7.29K decks
40%synergy
Top Cards
Swords to Plowshares
61%inclusion4.48K decks7.29K decks
-7%synergy
Mystic Remora
59%inclusion4.33K decks7.29K decks
39%synergy
Sevinne's Reclamation
47%inclusion3.44K decks7.29K decks
38%synergy
Mirrormade
46%inclusion3.35K decks7.29K decks
36%synergy
Entomb
44%inclusion3.20K decks7.29K decks
37%synergy
Fear of Sleep Paralysis
42%inclusion3.06K decks7.29K decks
37%synergy
Doomwake Giant
41%inclusion3K decks7.29K decks
35%synergy
Blind Obedience
41%inclusion2.99K decks7.29K decks
29%synergy
Dark Ritual
40%inclusion2.93K decks7.29K decks
21%synergy
Sphere of Safety
40%inclusion2.92K decks7.29K decks
31%synergy
Game Changers
Smothering Tithe
51%inclusion3.70K decks7.29K decks
20%synergy
Rhystic Study
49%inclusion3.54K decks7.29K decks
17%synergy
Enlightened Tutor
38%inclusion2.76K decks7.29K decks
18%synergy
Demonic Tutor
32%inclusion2.36K decks7.29K decks
12%synergy
Vampiric Tutor
30%inclusion2.16K decks7.29K decks
13%synergy
Thassa's Oracle
29%inclusion2.14K decks7.29K decks
20%synergy
Ancient Tomb
26%inclusion1.90K decks7.29K decks
13%synergy
Mana Vault
25%inclusion1.85K decks7.29K decks
16%synergy
Force of Will
25%inclusion1.85K decks7.29K decks
13%synergy
Fierce Guardianship
25%inclusion1.84K decks7.29K decks
5%synergy
Creatures
Scrabbling Skullcrab
39%inclusion2.88K decks7.29K decks
38%synergy
Ondu Spiritdancer
37%inclusion2.68K decks7.29K decks
31%synergy
Overlord of the Floodpits
35%inclusion2.56K decks7.29K decks
32%synergy
Abdel Adrian, Gorion's Ward
35%inclusion2.53K decks7.29K decks
33%synergy
Overlord of the Balemurk
34%inclusion2.48K decks7.29K decks
32%synergy
Esper Sentinel
34%inclusion2.46K decks7.29K decks
6%synergy
Victor, Valgavoth's Seneschal
33%inclusion2.38K decks7.29K decks
31%synergy
Fear of Impostors
30%inclusion2.18K decks7.29K decks
29%synergy
Zur, Eternal Schemer
29%inclusion2.11K decks7.29K decks
26%synergy
Grand Abolisher
28%inclusion2.04K decks7.29K decks
14%synergy
Lotho, Corrupt Shirriff
27%inclusion1.96K decks7.29K decks
10%synergy
Ghostly Dancers
24%inclusion1.76K decks7.29K decks
22%synergy
Orcish Bowmasters
23%inclusion1.69K decks7.29K decks
13%synergy
Valley Floodcaller
23%inclusion1.69K decks7.29K decks
19%synergy
Zur the Enchanter
23%inclusion1.66K decks7.29K decks
18%synergy
Silent Hallcreeper
23%inclusion1.64K decks7.29K decks
18%synergy
Soaring Lightbringer
22%inclusion1.62K decks7.29K decks
17%synergy
Hullbreaker Horror
21%inclusion1.53K decks7.29K decks
15%synergy
Enduring Curiosity
21%inclusion1.51K decks7.29K decks
13%synergy
Moon-Blessed Cleric
20%inclusion1.46K decks7.29K decks
15%synergy
Heliod, the Radiant Dawn
20%inclusion1.46K decks7.29K decks
16%synergy
Ranger-Captain of Eos
20%inclusion1.44K decks7.29K decks
14%synergy
Grim Guardian
20%inclusion1.43K decks7.29K decks
17%synergy
Aminatou, Veil Piercer
19%inclusion1.35K decks7.29K decks
17%synergy
Displacer Kitten
18%inclusion1.34K decks7.29K decks
12%synergy
Archon of Sun's Grace
17%inclusion1.26K decks7.29K decks
13%synergy
Opposition Agent
15%inclusion1.13K decks7.29K decks
7%synergy
Athreos, Shroud-Veiled
14%inclusion985 decks7.29K decks
9%synergy
Ledger Shredder
13%inclusion983 decks7.29K decks
5%synergy
Mindwrack Harpy
13%inclusion975 decks7.29K decks
13%synergy
Lurrus of the Dream-Den
13%inclusion957 decks7.29K decks
12%synergy
Drannith Magistrate
13%inclusion911 decks7.29K decks
5%synergy
Archetype of Imagination
12%inclusion880 decks7.29K decks
7%synergy
Overlord of the Mistmoors
12%inclusion879 decks7.29K decks
10%synergy
Sage of Mysteries
11%inclusion835 decks7.29K decks
11%synergy
Mockingbird
11%inclusion831 decks7.29K decks
7%synergy
Hedron Crab
11%inclusion830 decks7.29K decks
11%synergy
Voice of Victory
11%inclusion465 decks4.19K decks
3%synergy
Alseid of Life's Bounty
11%inclusion799 decks7.29K decks
10%synergy
Ancient Cellarspawn
11%inclusion797 decks7.29K decks
8%synergy
Archivist of Oghma
11%inclusion796 decks7.29K decks
4%synergy
Talion, the Kindly Lord
10%inclusion763 decks7.29K decks
3%synergy
Balemurk Leech
10%inclusion745 decks7.29K decks
10%synergy
Skullsnap Nuisance
10%inclusion739 decks7.29K decks
10%synergy
Spirited Companion
9.5%inclusion692 decks7.29K decks
8%synergy
Auriok Salvagers
9.3%inclusion675 decks7.29K decks
9%synergy
Gremlin Tamer
9.1%inclusion664 decks7.29K decks
8%synergy
Nashi, Searcher in the Dark
8.7%inclusion634 decks7.29K decks
8%synergy
Phyrexian Metamorph
8.7%inclusion633 decks7.29K decks
0%synergy
Wan Shi Tong, Librarian
8.6%inclusion157 decks1.82K decks
3%synergy
Instants
An Offer You Can't Refuse
36%inclusion2.60K decks7.29K decks
9%synergy
Swan Song
32%inclusion2.35K decks7.29K decks
12%synergy
Path to Exile
30%inclusion2.21K decks7.29K decks
-12%synergy
Counterspell
30%inclusion2.16K decks7.29K decks
-12%synergy
Silence
27%inclusion1.94K decks7.29K decks
16%synergy
Arcane Denial
26%inclusion1.92K decks7.29K decks
6%synergy
Cyclonic Rift
24%inclusion1.75K decks7.29K decks
0%synergy
Force of Negation
23%inclusion1.71K decks7.29K decks
12%synergy
Flusterstorm
23%inclusion1.68K decks7.29K decks
15%synergy
Demonic Consultation
23%inclusion1.64K decks7.29K decks
15%synergy
Tainted Pact
22%inclusion1.64K decks7.29K decks
15%synergy
Mindbreak Trap
21%inclusion1.52K decks7.29K decks
14%synergy
Intuition
20%inclusion1.47K decks7.29K decks
19%synergy
Pact of Negation
20%inclusion1.45K decks7.29K decks
12%synergy
Mystical Tutor
20%inclusion1.45K decks7.29K decks
9%synergy
Borne Upon a Wind
19%inclusion1.40K decks7.29K decks
14%synergy
Mental Misstep
19%inclusion1.39K decks7.29K decks
12%synergy
Mana Drain
18%inclusion1.29K decks7.29K decks
0%synergy
Cabal Ritual
17%inclusion1.24K decks7.29K decks
14%synergy
Void Rend
15%inclusion1.11K decks7.29K decks
-19%synergy
Sink into Stupor
15%inclusion1.10K decks7.29K decks
2%synergy
Thirst for Meaning
15%inclusion1.06K decks7.29K decks
13%synergy
Dovin's Veto
15%inclusion1.06K decks7.29K decks
-11%synergy
Otherworldly Gaze
13%inclusion933 decks7.29K decks
11%synergy
Frantic Search
13%inclusion923 decks7.29K decks
-5%synergy
Inkshield
13%inclusion923 decks7.29K decks
3%synergy
Chain of Vapor
11%inclusion813 decks7.29K decks
8%synergy
Brainstorm
10%inclusion742 decks7.29K decks
-7%synergy
Negate
10%inclusion736 decks7.29K decks
-6%synergy
Into the Flood Maw
10%inclusion724 decks7.29K decks
6%synergy
Gifts Ungiven
9.1%inclusion662 decks7.29K decks
7%synergy
Anguished Unmaking
8.3%inclusion608 decks7.29K decks
-17%synergy
Teferi's Protection
6.7%inclusion488 decks7.29K decks
-10%synergy
Fell the Profane
6.4%inclusion469 decks7.29K decks
-2%synergy
Utter End
5.8%inclusion426 decks7.29K decks
-1%synergy
Ad Nauseam
5.8%inclusion421 decks7.29K decks
4%synergy
Deadly Rollick
5.4%inclusion392 decks7.29K decks
-9%synergy
Retraction Helix
5.3%inclusion383 decks7.29K decks
5%synergy
Brain Freeze
5.2%inclusion382 decks7.29K decks
5%synergy
Generous Gift
5.2%inclusion382 decks7.29K decks
-9%synergy
Sorceries
Redress Fate
30%inclusion2.15K decks7.29K decks
24%synergy
Windfall
28%inclusion2.01K decks7.29K decks
14%synergy
Reanimate
26%inclusion1.93K decks7.29K decks
10%synergy
Toxic Deluge
21%inclusion1.52K decks7.29K decks
1%synergy
Imperial Seal
18%inclusion1.33K decks7.29K decks
11%synergy
Singularity Rupture
15%inclusion434 decks2.86K decks
13%synergy
Extinguish All Hope
15%inclusion1.07K decks7.29K decks
13%synergy
Dance of the Manse
14%inclusion1.03K decks7.29K decks
11%synergy
Time Wipe
11%inclusion820 decks7.29K decks
5%synergy
Damn
10%inclusion756 decks7.29K decks
-10%synergy
Demonic Counsel
10%inclusion719 decks7.29K decks
9%synergy
Idyllic Tutor
9.1%inclusion665 decks7.29K decks
5%synergy
Lively Dirge
8.9%inclusion652 decks7.29K decks
8%synergy
Supreme Verdict
8.9%inclusion645 decks7.29K decks
-6%synergy
Glimpse the Unthinkable
8.8%inclusion640 decks7.29K decks
8%synergy
Resurgent Belief
8.6%inclusion626 decks7.29K decks
7%synergy
Beseech the Mirror
8.5%inclusion616 decks7.29K decks
5%synergy
Unmarked Grave
8.2%inclusion595 decks7.29K decks
7%synergy
Ponder
7.8%inclusion569 decks7.29K decks
-1%synergy
Replenish
7.5%inclusion545 decks7.29K decks
6%synergy
Space-Time Anomaly
7.4%inclusion207 decks2.80K decks
6%synergy
Buried Alive
7.0%inclusion512 decks7.29K decks
3%synergy
Mnemonic Betrayal
6.8%inclusion494 decks7.29K decks
4%synergy
Farewell
5.3%inclusion388 decks7.29K decks
-7%synergy
Utility Artifacts
The One Ring
23%inclusion1.70K decks7.29K decks
10%synergy
Wishclaw Talisman
20%inclusion1.48K decks7.29K decks
12%synergy
Mesmeric Orb
15%inclusion1.12K decks7.29K decks
14%synergy
Cloud Key
10%inclusion705 decks7.29K decks
6%synergy
Lightning Greaves
8.1%inclusion592 decks7.29K decks
-14%synergy
Keys to the House
5.6%inclusion405 decks7.26K decks
5%synergy
Swiftfoot Boots
5.6%inclusion406 decks7.29K decks
-19%synergy
Enchantments
Dance of the Dead
39%inclusion2.85K decks7.29K decks
37%synergy
Secret Arcade // Dusty Parlor
37%inclusion2.71K decks7.29K decks
32%synergy
Amphibian Downpour
37%inclusion2.67K decks7.29K decks
32%synergy
Propaganda
34%inclusion2.51K decks7.29K decks
7%synergy
Sigil of the Empty Throne
33%inclusion2.43K decks7.29K decks
28%synergy
Grasp of Fate
30%inclusion2.21K decks7.29K decks
24%synergy
Seal of Cleansing
29%inclusion2.13K decks7.29K decks
28%synergy
Ghostly Prison
29%inclusion2.11K decks7.29K decks
7%synergy
Cemetery Tampering
28%inclusion2.07K decks7.29K decks
28%synergy
Monologue Tax
26%inclusion1.86K decks7.29K decks
19%synergy
Starfield of Nyx
25%inclusion1.83K decks7.29K decks
21%synergy
Necropotence
24%inclusion1.75K decks7.29K decks
17%synergy
Estrid's Invocation
24%inclusion1.72K decks7.29K decks
19%synergy
The Meathook Massacre
21%inclusion1.56K decks7.29K decks
18%synergy
Cacophony Unleashed
21%inclusion1.54K decks7.29K decks
19%synergy
Touch the Spirit Realm
21%inclusion1.53K decks7.29K decks
19%synergy
Shark Typhoon
21%inclusion1.50K decks7.29K decks
15%synergy
Defiled Crypt // Cadaver Lab
20%inclusion1.49K decks7.26K decks
20%synergy
Darksteel Mutation
20%inclusion1.48K decks7.29K decks
14%synergy
Tinybones Joins Up
19%inclusion1.40K decks7.29K decks
18%synergy
Stillness in Motion
18%inclusion743 decks4.08K decks
18%synergy
All That Glitters
17%inclusion1.23K decks7.29K decks
8%synergy
Polluted Cistern // Dim Oubliette
17%inclusion1.21K decks7.28K decks
16%synergy
Static Prison
16%inclusion1.20K decks7.29K decks
16%synergy
Extravagant Replication
16%inclusion1.20K decks7.29K decks
11%synergy
Copy Enchantment
16%inclusion1.19K decks7.29K decks
12%synergy
Timely Ward
16%inclusion1.18K decks7.29K decks
11%synergy
The Tale of Tamiyo
16%inclusion1.17K decks7.29K decks
16%synergy
Seal of Removal
16%inclusion1.14K decks7.29K decks
15%synergy
Ethereal Armor
16%inclusion1.14K decks7.29K decks
11%synergy
Phyrexian Arena
16%inclusion1.14K decks7.29K decks
2%synergy
Black Market Connections
15%inclusion1.08K decks7.29K decks
0%synergy
Greater Auramancy
15%inclusion1.08K decks7.29K decks
10%synergy
Out of the Tombs
15%inclusion1.07K decks7.29K decks
14%synergy
Imprisoned in the Moon
15%inclusion1.06K decks7.29K decks
8%synergy
Hallowed Haunting
14%inclusion1K decks7.29K decks
11%synergy
Bottomless Pool // Locker Room
14%inclusion995 decks7.29K decks
12%synergy
Restricted Office // Lecture Hall
13%inclusion968 decks7.29K decks
11%synergy
Leyline of Anticipation
13%inclusion955 decks7.29K decks
9%synergy
The Eldest Reborn
13%inclusion951 decks7.29K decks
11%synergy
Mirror Room // Fractured Realm
13%inclusion934 decks7.29K decks
11%synergy
Cramped Vents // Access Maze
13%inclusion922 decks7.29K decks
10%synergy
Trouble in Pairs
12%inclusion903 decks7.29K decks
7%synergy
Court of Cunning
12%inclusion883 decks7.29K decks
11%synergy
Sheltered by Ghosts
11%inclusion824 decks7.29K decks
9%synergy
Copy Artifact
11%inclusion799 decks7.29K decks
10%synergy
Central Elevator // Promising Stairs
11%inclusion784 decks7.29K decks
10%synergy
Dazzling Theater // Prop Room
10%inclusion760 decks7.26K decks
9%synergy
One with the Multiverse
10%inclusion755 decks7.29K decks
6%synergy
Teval's Judgment
10%inclusion426 decks4.16K decks
9%synergy
Battles
Invasion of Theros
6.1%inclusion441 decks7.29K decks
4%synergy
Planeswalkers
Teferi, Time Raveler
18%inclusion1.31K decks7.29K decks
10%synergy
Utility Lands
Hall of Heliod's Generosity
48%inclusion3.50K decks7.29K decks
35%synergy
Otawara, Soaring City
33%inclusion2.42K decks7.29K decks
14%synergy
Bojuka Bog
32%inclusion2.32K decks7.29K decks
5%synergy
Urza's Saga
15%inclusion1.10K decks7.29K decks
3%synergy
Cephalid Coliseum
14%inclusion1.04K decks7.29K decks
11%synergy
Reliquary Tower
13%inclusion947 decks7.29K decks
-21%synergy
Takenuma, Abandoned Mire
13%inclusion917 decks7.29K decks
6%synergy
Halimar Depths
10%inclusion740 decks7.29K decks
5%synergy
Urborg, Tomb of Yawgmoth
10%inclusion705 decks7.29K decks
-3%synergy
Emergence Zone
10%inclusion695 decks7.29K decks
7%synergy
Serra's Sanctum
9.0%inclusion658 decks7.29K decks
7%synergy
Minamo, School at Water's Edge
8.7%inclusion634 decks7.29K decks
5%synergy
Mana Artifacts
Sol Ring
91%inclusion6.59K decks7.29K decks
1%synergy
Arcane Signet
90%inclusion6.58K decks7.29K decks
2%synergy
Talisman of Dominance
58%inclusion4.22K decks7.29K decks
8%synergy
Talisman of Progress
50%inclusion3.68K decks7.29K decks
7%synergy
Talisman of Hierarchy
44%inclusion3.20K decks7.29K decks
0%synergy
Fellwar Stone
43%inclusion3.15K decks7.29K decks
10%synergy
Azorius Signet
34%inclusion2.46K decks7.29K decks
3%synergy
Orzhov Signet
32%inclusion2.34K decks7.29K decks
-1%synergy
Lotus Petal
26%inclusion1.90K decks7.29K decks
16%synergy
Dimir Signet
24%inclusion1.75K decks7.29K decks
-7%synergy
Chrome Mox
23%inclusion1.69K decks7.29K decks
14%synergy
Mox Diamond
20%inclusion1.42K decks7.29K decks
13%synergy
Mox Opal
19%inclusion1.39K decks7.29K decks
10%synergy
Lion's Eye Diamond
15%inclusion1.09K decks7.29K decks
13%synergy
Mind Stone
15%inclusion1.06K decks7.29K decks
2%synergy
Commander's Sphere
12%inclusion876 decks7.29K decks
-6%synergy
Mox Amber
10%inclusion764 decks7.29K decks
4%synergy
Grim Monolith
8.6%inclusion629 decks7.29K decks
5%synergy
Thought Vessel
6.4%inclusion464 decks7.29K decks
-18%synergy
Chromatic Lantern
5.9%inclusion428 decks7.29K decks
-7%synergy
Lands
Command Tower
94%inclusion6.83K decks7.29K decks
1%synergy
Island
85%inclusion6.22K decks7.29K decks
-8%synergy
Swamp
83%inclusion6.03K decks7.29K decks
-9%synergy
Plains
81%inclusion5.92K decks7.29K decks
-10%synergy
Godless Shrine
59%inclusion4.27K decks7.29K decks
8%synergy
Watery Grave
59%inclusion4.26K decks7.29K decks
8%synergy
Hallowed Fountain
58%inclusion4.25K decks7.29K decks
8%synergy
Exotic Orchard
56%inclusion4.04K decks7.29K decks
-3%synergy
Flooded Strand
52%inclusion3.79K decks7.29K decks
14%synergy
Polluted Delta
52%inclusion3.76K decks7.29K decks
14%synergy
Marsh Flats
49%inclusion3.55K decks7.29K decks
13%synergy
Arcane Sanctum
46%inclusion3.38K decks7.29K decks
-8%synergy
Caves of Koilos
45%inclusion3.25K decks7.29K decks
9%synergy
Adarkar Wastes
44%inclusion3.19K decks7.29K decks
12%synergy
Underground River
42%inclusion3.03K decks7.29K decks
8%synergy
Morphic Pool
40%inclusion2.92K decks7.29K decks
6%synergy
Sea of Clouds
39%inclusion2.86K decks7.29K decks
4%synergy
Vault of Champions
36%inclusion2.66K decks7.29K decks
4%synergy
Undercity Sewers
35%inclusion2.53K decks7.29K decks
20%synergy
Raffine's Tower
34%inclusion2.50K decks7.29K decks
-7%synergy
Glacial Fortress
30%inclusion2.17K decks7.29K decks
-12%synergy
Isolated Chapel
28%inclusion2.07K decks7.29K decks
-12%synergy
City of Brass
28%inclusion2.03K decks7.29K decks
13%synergy
Meticulous Archive
28%inclusion2.02K decks7.29K decks
14%synergy
Scrubland
27%inclusion1.97K decks7.29K decks
11%synergy
Tundra
27%inclusion1.97K decks7.29K decks
11%synergy
Underground Sea
27%inclusion1.93K decks7.29K decks
11%synergy
Mana Confluence
26%inclusion1.89K decks7.29K decks
12%synergy
Shadowy Backstreet
26%inclusion1.89K decks7.29K decks
13%synergy
Bloodstained Mire
25%inclusion1.84K decks7.29K decks
14%synergy
Misty Rainforest
25%inclusion1.82K decks7.29K decks
14%synergy
Drowned Catacomb
25%inclusion1.79K decks7.29K decks
-12%synergy
Prairie Stream
23%inclusion1.70K decks7.29K decks
-17%synergy
Verdant Catacombs
23%inclusion1.70K decks7.29K decks
13%synergy
Scalding Tarn
23%inclusion1.65K decks7.29K decks
12%synergy
Valgavoth's Lair
22%inclusion1.63K decks7.29K decks
20%synergy
Evolving Wilds
22%inclusion1.61K decks7.29K decks
-3%synergy
Sunken Hollow
22%inclusion1.60K decks7.29K decks
-18%synergy
Windswept Heath
22%inclusion1.59K decks7.29K decks
12%synergy
Gemstone Caverns
22%inclusion1.57K decks7.29K decks
14%synergy
Terramorphic Expanse
21%inclusion1.55K decks7.29K decks
5%synergy
Temple of Enlightenment
21%inclusion1.52K decks7.29K decks
5%synergy
Temple of Silence
20%inclusion1.49K decks7.29K decks
1%synergy
Arid Mesa
20%inclusion1.45K decks7.29K decks
10%synergy
Temple of Deceit
20%inclusion1.43K decks7.29K decks
2%synergy
Obscura Storefront
19%inclusion1.41K decks7.29K decks
10%synergy
Tainted Field
18%inclusion1.35K decks7.29K decks
11%synergy
Azorius Chancery
18%inclusion1.32K decks7.29K decks
4%synergy
Tainted Isle
18%inclusion1.32K decks7.29K decks
12%synergy
Dimir Aqueduct
17%inclusion1.27K decks7.29K decks
4%synergy