The Master of Keys (Commander)

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
Primary Research
5.6%inclusion70 decks1.24K decks
5%synergy
Exhibition Tidecaller
5.1%inclusion64 decks1.26K decks
5%synergy
Restoration Seminar
2.5%inclusion30 decks1.22K decks
1%synergy
Erode
1.8%inclusion22 decks1.22K decks
-2%synergy
Grave Researcher
1.6%inclusion20 decks1.26K decks
-1%synergy
High Synergy Cards
Ripples of Undeath
61%inclusion5.04K decks8.21K decks
59%synergy
Animate Dead
67%inclusion5.50K decks8.21K decks
57%synergy
Dress Down
57%inclusion4.66K decks8.21K decks
55%synergy
Inquisitive Glimmer
58%inclusion4.80K decks8.21K decks
51%synergy
Necromancy
55%inclusion4.48K decks8.21K decks
50%synergy
Mesa Enchantress
53%inclusion4.36K decks8.21K decks
44%synergy
Entity Tracker
50%inclusion4.11K decks8.21K decks
44%synergy
Starfield Mystic
50%inclusion4.12K decks8.21K decks
44%synergy
Gravebreaker Lamia
44%inclusion3.60K decks8.21K decks
43%synergy
Demon of Fate's Design
46%inclusion3.79K decks8.21K decks
41%synergy
Top Cards
Swords to Plowshares
61%inclusion4.97K decks8.21K decks
-7%synergy
Mystic Remora
58%inclusion4.79K decks8.21K decks
38%synergy
Mirrormade
47%inclusion3.86K decks8.21K decks
37%synergy
Sevinne's Reclamation
46%inclusion3.81K decks8.21K decks
38%synergy
Entomb
43%inclusion3.56K decks8.21K decks
37%synergy
Fear of Sleep Paralysis
42%inclusion3.47K decks8.21K decks
37%synergy
Doomwake Giant
42%inclusion3.45K decks8.21K decks
36%synergy
Sphere of Safety
41%inclusion3.36K decks8.21K decks
32%synergy
Scrabbling Skullcrab
40%inclusion3.31K decks8.21K decks
39%synergy
Blind Obedience
40%inclusion3.30K decks8.21K decks
28%synergy
Game Changers
Smothering Tithe
50%inclusion4.08K decks8.21K decks
19%synergy
Rhystic Study
47%inclusion3.87K decks8.21K decks
17%synergy
Enlightened Tutor
36%inclusion2.98K decks8.21K decks
18%synergy
Demonic Tutor
31%inclusion2.53K decks8.21K decks
11%synergy
Vampiric Tutor
28%inclusion2.31K decks8.21K decks
12%synergy
Thassa's Oracle
28%inclusion2.30K decks8.21K decks
19%synergy
Ancient Tomb
25%inclusion2.04K decks8.21K decks
12%synergy
Force of Will
24%inclusion1.98K decks8.21K decks
12%synergy
Mana Vault
24%inclusion1.97K decks8.21K decks
15%synergy
Fierce Guardianship
24%inclusion1.96K decks8.21K decks
4%synergy
Creatures
Ondu Spiritdancer
37%inclusion3.04K decks8.21K decks
31%synergy
Overlord of the Floodpits
36%inclusion2.96K decks8.21K decks
33%synergy
Overlord of the Balemurk
34%inclusion2.81K decks8.21K decks
32%synergy
Abdel Adrian, Gorion's Ward
33%inclusion2.75K decks8.21K decks
32%synergy
Victor, Valgavoth's Seneschal
33%inclusion2.73K decks8.21K decks
31%synergy
Esper Sentinel
32%inclusion2.65K decks8.21K decks
5%synergy
Fear of Impostors
31%inclusion2.51K decks8.21K decks
29%synergy
Zur, Eternal Schemer
30%inclusion2.43K decks8.21K decks
26%synergy
Grand Abolisher
27%inclusion2.19K decks8.21K decks
12%synergy
Lotho, Corrupt Shirriff
26%inclusion2.14K decks8.21K decks
9%synergy
Ghostly Dancers
24%inclusion1.99K decks8.21K decks
22%synergy
Silent Hallcreeper
23%inclusion1.89K decks8.21K decks
18%synergy
Zur the Enchanter
23%inclusion1.88K decks8.21K decks
18%synergy
Soaring Lightbringer
22%inclusion1.84K decks8.21K decks
18%synergy
Valley Floodcaller
22%inclusion1.79K decks8.21K decks
18%synergy
Orcish Bowmasters
22%inclusion1.79K decks8.21K decks
12%synergy
Enduring Curiosity
21%inclusion1.71K decks8.21K decks
13%synergy
Grim Guardian
20%inclusion1.68K decks8.21K decks
18%synergy
Moon-Blessed Cleric
20%inclusion1.64K decks8.21K decks
15%synergy
Hullbreaker Horror
20%inclusion1.64K decks8.21K decks
14%synergy
Heliod, the Radiant Dawn
20%inclusion1.63K decks8.21K decks
16%synergy
Ranger-Captain of Eos
19%inclusion1.53K decks8.21K decks
13%synergy
Aminatou, Veil Piercer
19%inclusion1.52K decks8.21K decks
17%synergy
Archon of Sun's Grace
17%inclusion1.43K decks8.21K decks
13%synergy
Displacer Kitten
17%inclusion1.42K decks8.21K decks
11%synergy
Opposition Agent
15%inclusion1.20K decks8.21K decks
7%synergy
Athreos, Shroud-Veiled
14%inclusion1.13K decks8.21K decks
9%synergy
Mindwrack Harpy
13%inclusion1.10K decks8.21K decks
13%synergy
Ledger Shredder
13%inclusion1.05K decks8.21K decks
4%synergy
Lurrus of the Dream-Den
13%inclusion1.04K decks8.21K decks
11%synergy
Archetype of Imagination
12%inclusion1K decks8.21K decks
8%synergy
Overlord of the Mistmoors
12%inclusion996 decks8.21K decks
10%synergy
Sage of Mysteries
12%inclusion988 decks8.21K decks
12%synergy
Hedron Crab
12%inclusion975 decks8.21K decks
11%synergy
Drannith Magistrate
11%inclusion942 decks8.21K decks
4%synergy
Alseid of Life's Bounty
11%inclusion920 decks8.21K decks
10%synergy
Mockingbird
11%inclusion902 decks8.21K decks
7%synergy
Ancient Cellarspawn
11%inclusion898 decks8.21K decks
8%synergy
Voice of Victory
11%inclusion548 decks5.15K decks
2%synergy
Eiganjo Dynastorian
11%inclusion132 decks1.24K decks
9%synergy
Skullsnap Nuisance
10%inclusion857 decks8.21K decks
10%synergy
Balemurk Leech
10%inclusion837 decks8.21K decks
10%synergy
Archivist of Oghma
10%inclusion828 decks8.21K decks
4%synergy
Talion, the Kindly Lord
10%inclusion784 decks8.21K decks
2%synergy
Spirited Companion
9.4%inclusion775 decks8.21K decks
8%synergy
Gremlin Tamer
9.1%inclusion751 decks8.21K decks
8%synergy
Auriok Salvagers
8.7%inclusion715 decks8.21K decks
8%synergy
Nashi, Searcher in the Dark
8.5%inclusion699 decks8.21K decks
8%synergy
Phyrexian Metamorph
8.0%inclusion655 decks8.21K decks
-0%synergy
Wan Shi Tong, Librarian
7.7%inclusion220 decks2.85K decks
3%synergy
Instants
Dark Ritual
40%inclusion3.25K decks8.21K decks
19%synergy
An Offer You Can't Refuse
35%inclusion2.89K decks8.21K decks
7%synergy
Swan Song
32%inclusion2.59K decks8.21K decks
11%synergy
Path to Exile
30%inclusion2.47K decks8.21K decks
-12%synergy
Counterspell
30%inclusion2.47K decks8.21K decks
-12%synergy
Arcane Denial
27%inclusion2.18K decks8.21K decks
6%synergy
Silence
25%inclusion2.08K decks8.21K decks
15%synergy
Cyclonic Rift
23%inclusion1.86K decks8.21K decks
-0%synergy
Force of Negation
22%inclusion1.82K decks8.21K decks
10%synergy
Flusterstorm
22%inclusion1.79K decks8.21K decks
14%synergy
Demonic Consultation
21%inclusion1.75K decks8.21K decks
14%synergy
Tainted Pact
21%inclusion1.74K decks8.21K decks
15%synergy
Mindbreak Trap
20%inclusion1.62K decks8.21K decks
13%synergy
Pact of Negation
19%inclusion1.55K decks8.21K decks
12%synergy
Intuition
19%inclusion1.55K decks8.21K decks
17%synergy
Mystical Tutor
19%inclusion1.55K decks8.21K decks
8%synergy
Borne Upon a Wind
18%inclusion1.50K decks8.21K decks
13%synergy
Mental Misstep
18%inclusion1.48K decks8.21K decks
12%synergy
Mana Drain
17%inclusion1.42K decks8.21K decks
0%synergy
Cabal Ritual
17%inclusion1.37K decks8.21K decks
13%synergy
Void Rend
15%inclusion1.26K decks8.21K decks
-19%synergy
Sink into Stupor
15%inclusion1.22K decks8.21K decks
2%synergy
Dovin's Veto
15%inclusion1.22K decks8.21K decks
-11%synergy
Thirst for Meaning
15%inclusion1.21K decks8.21K decks
13%synergy
Frantic Search
13%inclusion1.08K decks8.21K decks
-5%synergy
Otherworldly Gaze
13%inclusion1.07K decks8.21K decks
11%synergy
Inkshield
13%inclusion1.04K decks8.21K decks
3%synergy
Chain of Vapor
11%inclusion866 decks8.21K decks
8%synergy
Brainstorm
10%inclusion840 decks8.21K decks
-7%synergy
Negate
10%inclusion822 decks8.21K decks
-6%synergy
Gifts Ungiven
10%inclusion803 decks8.21K decks
7%synergy
Into the Flood Maw
9.5%inclusion778 decks8.21K decks
6%synergy
Anguished Unmaking
8.3%inclusion681 decks8.21K decks
-18%synergy
Fell the Profane
6.5%inclusion537 decks8.21K decks
-3%synergy
Teferi's Protection
6.5%inclusion530 decks8.21K decks
-10%synergy
Utter End
5.9%inclusion481 decks8.21K decks
-0%synergy
Ad Nauseam
5.5%inclusion449 decks8.21K decks
3%synergy
Deadly Rollick
5.4%inclusion444 decks8.21K decks
-10%synergy
Generous Gift
5.2%inclusion426 decks8.21K decks
-9%synergy
Brain Freeze
5.1%inclusion422 decks8.21K decks
5%synergy
Retraction Helix
5.0%inclusion413 decks8.21K decks
4%synergy
Sorceries
Redress Fate
30%inclusion2.44K decks8.21K decks
24%synergy
Windfall
27%inclusion2.23K decks8.21K decks
14%synergy
Reanimate
26%inclusion2.15K decks8.21K decks
10%synergy
Toxic Deluge
20%inclusion1.64K decks8.21K decks
0%synergy
Imperial Seal
17%inclusion1.41K decks8.21K decks
10%synergy
Extinguish All Hope
15%inclusion1.22K decks8.21K decks
13%synergy
Dance of the Manse
14%inclusion1.17K decks8.21K decks
11%synergy
Singularity Rupture
14%inclusion550 decks3.85K decks
12%synergy
Time Wipe
11%inclusion905 decks8.21K decks
5%synergy
Damn
10%inclusion821 decks8.21K decks
-10%synergy
Demonic Counsel
9.3%inclusion768 decks8.21K decks
8%synergy
Glimpse the Unthinkable
9.3%inclusion763 decks8.21K decks
9%synergy
Idyllic Tutor
9.2%inclusion758 decks8.21K decks
5%synergy
Supreme Verdict
9.0%inclusion740 decks8.21K decks
-6%synergy
Lively Dirge
8.8%inclusion727 decks8.21K decks
8%synergy
Resurgent Belief
8.7%inclusion716 decks8.21K decks
7%synergy
Beseech the Mirror
8.2%inclusion671 decks8.21K decks
4%synergy
Unmarked Grave
8.0%inclusion657 decks8.21K decks
7%synergy
Ponder
7.8%inclusion642 decks8.21K decks
-1%synergy
Replenish
7.7%inclusion629 decks8.21K decks
6%synergy
Buried Alive
7.2%inclusion592 decks8.21K decks
3%synergy
Space-Time Anomaly
6.9%inclusion261 decks3.79K decks
5%synergy
Mnemonic Betrayal
6.4%inclusion522 decks8.21K decks
4%synergy
Farewell
5.1%inclusion417 decks8.21K decks
-7%synergy
Utility Artifacts
The One Ring
22%inclusion1.77K decks8.21K decks
9%synergy
Wishclaw Talisman
19%inclusion1.58K decks8.21K decks
12%synergy
Mesmeric Orb
16%inclusion1.28K decks8.21K decks
14%synergy
Cloud Key
10%inclusion821 decks8.21K decks
7%synergy
Lightning Greaves
8.0%inclusion654 decks8.21K decks
-15%synergy
Keys to the House
5.7%inclusion471 decks8.20K decks
6%synergy
Swiftfoot Boots
5.6%inclusion464 decks8.21K decks
-18%synergy
Enchantments
Dance of the Dead
38%inclusion3.12K decks8.21K decks
36%synergy
Secret Arcade // Dusty Parlor
38%inclusion3.09K decks8.21K decks
33%synergy
Amphibian Downpour
37%inclusion3.05K decks8.21K decks
33%synergy
Propaganda
35%inclusion2.90K decks8.21K decks
6%synergy
Sigil of the Empty Throne
34%inclusion2.77K decks8.21K decks
28%synergy
Grasp of Fate
31%inclusion2.54K decks8.21K decks
25%synergy
Ghostly Prison
30%inclusion2.48K decks8.21K decks
7%synergy
Seal of Cleansing
30%inclusion2.48K decks8.21K decks
29%synergy
Cemetery Tampering
29%inclusion2.39K decks8.21K decks
28%synergy
Monologue Tax
26%inclusion2.15K decks8.21K decks
20%synergy
Starfield of Nyx
26%inclusion2.11K decks8.21K decks
22%synergy
Estrid's Invocation
24%inclusion2.01K decks8.21K decks
20%synergy
Necropotence
23%inclusion1.86K decks8.21K decks
16%synergy
Cacophony Unleashed
22%inclusion1.80K decks8.21K decks
20%synergy
The Meathook Massacre
21%inclusion1.75K decks8.21K decks
18%synergy
Darksteel Mutation
21%inclusion1.69K decks8.21K decks
15%synergy
Touch the Spirit Realm
21%inclusion1.69K decks8.21K decks
18%synergy
Defiled Crypt // Cadaver Lab
21%inclusion1.68K decks8.20K decks
20%synergy
Shark Typhoon
20%inclusion1.67K decks8.21K decks
15%synergy
Tinybones Joins Up
18%inclusion1.52K decks8.21K decks
17%synergy
Stillness in Motion
18%inclusion908 decks5.05K decks
18%synergy
Copy Enchantment
17%inclusion1.43K decks8.21K decks
13%synergy
All That Glitters
17%inclusion1.40K decks8.21K decks
9%synergy
Extravagant Replication
17%inclusion1.39K decks8.21K decks
12%synergy
Polluted Cistern // Dim Oubliette
17%inclusion1.37K decks8.21K decks
16%synergy
Timely Ward
16%inclusion1.34K decks8.21K decks
11%synergy
The Tale of Tamiyo
16%inclusion1.32K decks8.21K decks
16%synergy
Seal of Removal
16%inclusion1.32K decks8.21K decks
15%synergy
Ethereal Armor
16%inclusion1.30K decks8.21K decks
11%synergy
Phyrexian Arena
16%inclusion1.29K decks8.21K decks
2%synergy
Static Prison
16%inclusion1.29K decks8.21K decks
15%synergy
Black Market Connections
15%inclusion1.24K decks8.21K decks
0%synergy
Greater Auramancy
15%inclusion1.24K decks8.21K decks
11%synergy
Out of the Tombs
15%inclusion1.23K decks8.21K decks
15%synergy
Imprisoned in the Moon
15%inclusion1.22K decks8.21K decks
8%synergy
Hallowed Haunting
14%inclusion1.13K decks8.21K decks
11%synergy
Bottomless Pool // Locker Room
14%inclusion1.13K decks8.21K decks
12%synergy
Restricted Office // Lecture Hall
13%inclusion1.10K decks8.21K decks
11%synergy
Leyline of Anticipation
13%inclusion1.09K decks8.21K decks
9%synergy
The Eldest Reborn
13%inclusion1.07K decks8.21K decks
11%synergy
Mirror Room // Fractured Realm
13%inclusion1.07K decks8.21K decks
11%synergy
Cramped Vents // Access Maze
13%inclusion1.05K decks8.21K decks
11%synergy
Court of Cunning
12%inclusion999 decks8.21K decks
11%synergy
Sheltered by Ghosts
12%inclusion973 decks8.21K decks
9%synergy
Trouble in Pairs
12%inclusion968 decks8.21K decks
7%synergy
Central Elevator // Promising Stairs
11%inclusion899 decks8.21K decks
10%synergy
One with the Multiverse
11%inclusion873 decks8.21K decks
6%synergy
Teval's Judgment
11%inclusion543 decks5.12K decks
10%synergy
Dazzling Theater // Prop Room
11%inclusion864 decks8.20K decks
9%synergy
Secrets of the Dead
10%inclusion840 decks8.21K decks
10%synergy
Battles
Invasion of Theros
6.0%inclusion493 decks8.21K decks
4%synergy
Planeswalkers
Teferi, Time Raveler
17%inclusion1.38K decks8.21K decks
9%synergy
Utility Lands
Hall of Heliod's Generosity
48%inclusion3.96K decks8.21K decks
35%synergy
Bojuka Bog
32%inclusion2.66K decks8.21K decks
6%synergy
Otawara, Soaring City
32%inclusion2.63K decks8.21K decks
13%synergy
Urza's Saga
15%inclusion1.20K decks8.21K decks
3%synergy
Cephalid Coliseum
14%inclusion1.16K decks8.21K decks
11%synergy
Reliquary Tower
13%inclusion1.08K decks8.21K decks
-21%synergy
Takenuma, Abandoned Mire
13%inclusion1.03K decks8.21K decks
6%synergy
Halimar Depths
10%inclusion847 decks8.21K decks
6%synergy
Urborg, Tomb of Yawgmoth
10%inclusion790 decks8.21K decks
-3%synergy
Emergence Zone
9.1%inclusion748 decks8.21K decks
7%synergy
Serra's Sanctum
9.1%inclusion747 decks8.21K decks
7%synergy
Minamo, School at Water's Edge
8.0%inclusion654 decks8.21K decks
4%synergy
Mana Artifacts
Sol Ring
90%inclusion7.39K decks8.21K decks
0%synergy
Arcane Signet
90%inclusion7.36K decks8.21K decks
2%synergy
Talisman of Dominance
57%inclusion4.70K decks8.21K decks
7%synergy
Talisman of Progress
50%inclusion4.13K decks8.21K decks
6%synergy
Talisman of Hierarchy
44%inclusion3.63K decks8.21K decks
-1%synergy
Fellwar Stone
43%inclusion3.49K decks8.21K decks
9%synergy
Azorius Signet
34%inclusion2.80K decks8.21K decks
5%synergy
Orzhov Signet
32%inclusion2.65K decks8.21K decks
1%synergy
Lotus Petal
25%inclusion2.04K decks8.21K decks
14%synergy
Dimir Signet
24%inclusion1.99K decks8.21K decks
-6%synergy
Chrome Mox
22%inclusion1.80K decks8.21K decks
13%synergy
Mox Diamond
18%inclusion1.51K decks8.21K decks
12%synergy
Mox Opal
18%inclusion1.48K decks8.21K decks
10%synergy
Mind Stone
15%inclusion1.21K decks8.21K decks
3%synergy
Lion's Eye Diamond
14%inclusion1.15K decks8.21K decks
12%synergy
Commander's Sphere
12%inclusion986 decks8.21K decks
-5%synergy
Mox Amber
10%inclusion819 decks8.21K decks
4%synergy
Grim Monolith
8.2%inclusion676 decks8.21K decks
5%synergy
Thought Vessel
6.4%inclusion522 decks8.21K decks
-19%synergy
Chromatic Lantern
5.8%inclusion475 decks8.21K decks
-7%synergy
Lands
Command Tower
94%inclusion7.69K decks8.21K decks
1%synergy
Island
86%inclusion7.06K decks8.21K decks
-7%synergy
Swamp
84%inclusion6.88K decks8.21K decks
-8%synergy
Plains
82%inclusion6.76K decks8.21K decks
-10%synergy
Godless Shrine
59%inclusion4.82K decks8.21K decks
7%synergy
Hallowed Fountain
58%inclusion4.80K decks8.21K decks
7%synergy
Watery Grave
58%inclusion4.80K decks8.21K decks
7%synergy
Exotic Orchard
55%inclusion4.54K decks8.21K decks
-4%synergy
Flooded Strand
51%inclusion4.20K decks8.21K decks
13%synergy
Polluted Delta
51%inclusion4.17K decks8.21K decks
13%synergy
Marsh Flats
48%inclusion3.93K decks8.21K decks
12%synergy
Arcane Sanctum
47%inclusion3.86K decks8.21K decks
-7%synergy
Caves of Koilos
45%inclusion3.70K decks8.21K decks
9%synergy
Adarkar Wastes
44%inclusion3.64K decks8.21K decks
12%synergy
Underground River
42%inclusion3.46K decks8.21K decks
7%synergy
Morphic Pool
39%inclusion3.24K decks8.21K decks
6%synergy
Sea of Clouds
39%inclusion3.19K decks8.21K decks
4%synergy
Vault of Champions
36%inclusion2.95K decks8.21K decks
4%synergy
Raffine's Tower
35%inclusion2.84K decks8.21K decks
-6%synergy
Undercity Sewers
34%inclusion2.81K decks8.21K decks
19%synergy
Glacial Fortress
31%inclusion2.54K decks8.21K decks
-12%synergy
Isolated Chapel
30%inclusion2.43K decks8.21K decks
-12%synergy
Meticulous Archive
28%inclusion2.26K decks8.21K decks
14%synergy
City of Brass
27%inclusion2.23K decks8.21K decks
12%synergy
Scrubland
26%inclusion2.13K decks8.21K decks
10%synergy
Shadowy Backstreet
26%inclusion2.13K decks8.21K decks
13%synergy
Tundra
26%inclusion2.12K decks8.21K decks
10%synergy
Drowned Catacomb
26%inclusion2.10K decks8.21K decks
-13%synergy
Underground Sea
25%inclusion2.09K decks8.21K decks
10%synergy
Mana Confluence
25%inclusion2.06K decks8.21K decks
11%synergy
Bloodstained Mire
24%inclusion1.99K decks8.21K decks
14%synergy
Prairie Stream
24%inclusion1.96K decks8.21K decks
-17%synergy
Misty Rainforest
24%inclusion1.95K decks8.21K decks
13%synergy
Valgavoth's Lair
23%inclusion1.86K decks8.21K decks
20%synergy
Sunken Hollow
23%inclusion1.85K decks8.21K decks
-17%synergy
Verdant Catacombs
22%inclusion1.82K decks8.21K decks
13%synergy
Evolving Wilds
22%inclusion1.81K decks8.21K decks
-2%synergy
Scalding Tarn
22%inclusion1.77K decks8.21K decks
11%synergy
Terramorphic Expanse
21%inclusion1.74K decks8.21K decks
6%synergy
Temple of Enlightenment
21%inclusion1.71K decks8.21K decks
5%synergy
Windswept Heath
21%inclusion1.70K decks8.21K decks
11%synergy
Temple of Silence
20%inclusion1.68K decks8.21K decks
2%synergy
Gemstone Caverns
20%inclusion1.68K decks8.21K decks
13%synergy
Temple of Deceit
20%inclusion1.62K decks8.21K decks
3%synergy
Arid Mesa
19%inclusion1.55K decks8.21K decks
10%synergy
Obscura Storefront
19%inclusion1.55K decks8.21K decks
10%synergy
Tainted Field
19%inclusion1.53K decks8.21K decks
12%synergy
Tainted Isle
18%inclusion1.50K decks8.21K decks
12%synergy
Azorius Chancery
18%inclusion1.49K decks8.21K decks
5%synergy
Dimir Aqueduct
17%inclusion1.43K decks8.21K decks
5%synergy