Koma, Cosmos Serpent (Commander) - Core

Alternate Names:

The Monstrous SerpentThe Monstrous Serpent

Koma, Cosmos Serpent
Rank #304
592decks
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Background image for How To Play Sea Creatures Differently In Commander
Sikora
Nov 13, 2025
Sikora
How To Play Sea Creatures Differently In Commander
Sea creatures in Magic are basically as old as the game itself, but they've changed significantly in that time.
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The Unagi of Kyoshi Island
18%inclusion9 decks51 decks
12%synergy
Shared Roots
8.3%inclusion4 decks48 decks
5%synergy
Ember Island Production
4.3%inclusion2 decks47 decks
3%synergy
Agna Qel'a
2.2%inclusion1 decks45 decks
1%synergy
Waterbender Ascension
2.2%inclusion1 decks45 decks
2%synergy
High Synergy Cards
Whelming Wave
74%inclusion438 decks592 decks
63%synergy
Adrix and Nev, Twincasters
64%inclusion380 decks592 decks
56%synergy
Junk Winder
61%inclusion364 decks592 decks
55%synergy
Koma, World-Eater
63%inclusion246 decks392 decks
50%synergy
Elemental Bond
55%inclusion325 decks592 decks
49%synergy
Irenicus's Vile Duplication
48%inclusion282 decks592 decks
41%synergy
Serpent of Yawning Depths
43%inclusion255 decks592 decks
37%synergy
Garruk's Packleader
38%inclusion225 decks592 decks
36%synergy
Arixmethes, Slumbering Isle
49%inclusion290 decks592 decks
36%synergy
Kodama's Reach
71%inclusion423 decks592 decks
35%synergy
Top Cards
Cultivate
80%inclusion474 decks592 decks
33%synergy
Rampant Growth
72%inclusion426 decks592 decks
31%synergy
Growth Spiral
66%inclusion391 decks592 decks
21%synergy
Counterspell
66%inclusion391 decks592 decks
16%synergy
Beast Within
60%inclusion355 decks592 decks
10%synergy
Negate
55%inclusion323 decks592 decks
29%synergy
Aesi, Tyrant of Gyre Strait
48%inclusion284 decks592 decks
31%synergy
Tatyova, Benthic Druid
47%inclusion279 decks592 decks
16%synergy
Nature's Lore
45%inclusion269 decks592 decks
15%synergy
Farseek
45%inclusion268 decks592 decks
20%synergy
Game Changers
Seedborn Muse
10%inclusion61 decks592 decks
-5%synergy
Creatures
Spark Double
44%inclusion260 decks592 decks
34%synergy
Sakura-Tribe Elder
44%inclusion259 decks592 decks
24%synergy
Murkfiend Liege
43%inclusion256 decks592 decks
29%synergy
Llanowar Elves
43%inclusion255 decks592 decks
15%synergy
Spawning Kraken
41%inclusion243 decks592 decks
34%synergy
Slinn Voda, the Rising Deep
36%inclusion216 decks592 decks
30%synergy
Elvish Mystic
34%inclusion203 decks592 decks
10%synergy
Coiling Oracle
33%inclusion196 decks592 decks
20%synergy
Hullbreaker Horror
31%inclusion183 decks592 decks
13%synergy
Esix, Fractal Bloom
27%inclusion157 decks592 decks
23%synergy
Eternal Witness
26%inclusion153 decks592 decks
5%synergy
Octomancer
26%inclusion128 decks497 decks
21%synergy
Scourge of Fleets
26%inclusion151 decks592 decks
18%synergy
Archetype of Imagination
25%inclusion149 decks592 decks
21%synergy
Summon: Leviathan
24%inclusion40 decks165 decks
17%synergy
Fyndhorn Elves
24%inclusion143 decks592 decks
9%synergy
Sakashima the Impostor
24%inclusion142 decks592 decks
21%synergy
Nadir Kraken
23%inclusion138 decks592 decks
19%synergy
Sakashima of a Thousand Faces
23%inclusion136 decks592 decks
18%synergy
Ohran Frostfang
23%inclusion135 decks592 decks
19%synergy
Birds of Paradise
21%inclusion127 decks592 decks
-6%synergy
Reclamation Sage
21%inclusion124 decks592 decks
7%synergy
Xolatoyac, the Smiling Flood
19%inclusion115 decks592 decks
12%synergy
Enduring Vitality
18%inclusion85 decks464 decks
11%synergy
Rampaging Baloths
18%inclusion105 decks592 decks
1%synergy
Stormtide Leviathan
17%inclusion103 decks592 decks
12%synergy
Avenger of Zendikar
17%inclusion102 decks592 decks
-1%synergy
Nezahal, Primal Tide
17%inclusion102 decks592 decks
6%synergy
Troyan, Gutsy Explorer
16%inclusion95 decks592 decks
13%synergy
Scute Swarm
16%inclusion94 decks592 decks
-5%synergy
Curiosity Crafter
16%inclusion94 decks592 decks
12%synergy
Kiora, Sovereign of the Deep
14%inclusion83 decks592 decks
12%synergy
Inga and Esika
14%inclusion82 decks592 decks
11%synergy
Fanatic of Rhonas
14%inclusion71 decks525 decks
8%synergy
Tromokratis
13%inclusion78 decks592 decks
8%synergy
Reef Worm
13%inclusion77 decks592 decks
9%synergy
Starwinder
12%inclusion14 decks113 decks
6%synergy
Saryth, the Viper's Fang
11%inclusion68 decks592 decks
10%synergy
Roaming Throne
11%inclusion67 decks592 decks
3%synergy
Toski, Bearer of Secrets
11%inclusion66 decks592 decks
8%synergy
Progenitor Mimic
11%inclusion64 decks592 decks
6%synergy
Tireless Provisioner
11%inclusion63 decks592 decks
-5%synergy
Lotus Cobra
10%inclusion61 decks592 decks
-3%synergy
Enduring Curiosity
10%inclusion46 decks469 decks
7%synergy
Craterhoof Behemoth
9.1%inclusion54 decks592 decks
0%synergy
Jaheira, Friend of the Forest
9.1%inclusion54 decks592 decks
5%synergy
Stormsurge Kraken
9.1%inclusion54 decks592 decks
5%synergy
Simic Sky Swallower
8.8%inclusion52 decks592 decks
5%synergy
Loot, Exuberant Explorer
8.5%inclusion33 decks386 decks
1%synergy
Uro, Titan of Nature's Wrath
8.3%inclusion49 decks592 decks
-2%synergy
Instants
Double Major
42%inclusion246 decks592 decks
33%synergy
Return of the Wildspeaker
36%inclusion212 decks592 decks
25%synergy
Second Harvest
34%inclusion203 decks592 decks
28%synergy
Arcane Denial
31%inclusion185 decks592 decks
9%synergy
Heroic Intervention
30%inclusion175 decks592 decks
-1%synergy
Pongify
29%inclusion171 decks592 decks
4%synergy
Rapid Hybridization
28%inclusion166 decks592 decks
2%synergy
Simic Charm
28%inclusion165 decks592 decks
20%synergy
An Offer You Can't Refuse
25%inclusion148 decks592 decks
2%synergy
Krosan Grip
24%inclusion141 decks592 decks
16%synergy
Reality Shift
23%inclusion136 decks592 decks
8%synergy
Planar Genesis
21%inclusion112 decks525 decks
11%synergy
Eureka Moment
20%inclusion118 decks592 decks
9%synergy
Snakeskin Veil
19%inclusion112 decks592 decks
13%synergy
Harrow
18%inclusion107 decks592 decks
6%synergy
Return to Nature
18%inclusion105 decks592 decks
12%synergy
Brainstorm
16%inclusion96 decks592 decks
2%synergy
Aetherize
16%inclusion96 decks592 decks
4%synergy
Nature's Claim
16%inclusion94 decks592 decks
6%synergy
Tamiyo's Safekeeping
14%inclusion84 decks592 decks
8%synergy
Voidslime
13%inclusion76 decks592 decks
8%synergy
Plasm Capture
12%inclusion69 decks592 decks
8%synergy
Perplexing Test
12%inclusion69 decks592 decks
7%synergy
Decisive Denial
11%inclusion68 decks592 decks
6%synergy
Entish Restoration
11%inclusion67 decks592 decks
2%synergy
Mystic Reflection
9.5%inclusion56 decks592 decks
7%synergy
Swan Song
8.8%inclusion52 decks592 decks
-10%synergy
Resculpt
8.4%inclusion50 decks592 decks
2%synergy
Saw It Coming
8.3%inclusion49 decks592 decks
7%synergy
Collective Resistance
7.8%inclusion41 decks526 decks
4%synergy
Joint Exploration
7.8%inclusion46 decks592 decks
2%synergy
Stubborn Denial
7.4%inclusion44 decks592 decks
5%synergy
Disdainful Stroke
7.3%inclusion43 decks592 decks
6%synergy
Tyvar's Stand
7.1%inclusion42 decks592 decks
4%synergy
Sublime Epiphany
6.6%inclusion39 decks592 decks
5%synergy
Cancel
6.4%inclusion38 decks592 decks
4%synergy
Sink into Stupor
6.3%inclusion33 decks526 decks
-5%synergy
Fact or Fiction
6.3%inclusion37 decks592 decks
4%synergy
Archdruid's Charm
5.9%inclusion35 decks590 decks
0%synergy
Mana Drain
5.9%inclusion35 decks592 decks
-10%synergy
Opt
5.7%inclusion34 decks592 decks
-2%synergy
Roiling Regrowth
5.6%inclusion33 decks592 decks
1%synergy
Dispel
5.6%inclusion33 decks592 decks
1%synergy
Rewind
5.2%inclusion31 decks592 decks
2%synergy
Mana Leak
5.2%inclusion31 decks592 decks
3%synergy
Sorceries
Explore
39%inclusion228 decks592 decks
18%synergy
Three Visits
32%inclusion187 decks592 decks
8%synergy
Skyshroud Claim
31%inclusion182 decks592 decks
22%synergy
Overwhelming Stampede
27%inclusion161 decks592 decks
15%synergy
Urban Evolution
27%inclusion157 decks592 decks
17%synergy
Shamanic Revelation
23%inclusion139 decks592 decks
18%synergy
Migration Path
21%inclusion126 decks592 decks
18%synergy
Quantum Misalignment
20%inclusion121 decks592 decks
18%synergy
Rite of Replication
17%inclusion102 decks592 decks
10%synergy
Explosive Vegetation
16%inclusion94 decks592 decks
10%synergy
Harmonize
16%inclusion94 decks592 decks
10%synergy
Search for Tomorrow
16%inclusion94 decks592 decks
11%synergy
Rishkar's Expertise
15%inclusion87 decks592 decks
6%synergy
Curse of the Swine
14%inclusion81 decks592 decks
3%synergy
Distant Melody
13%inclusion76 decks592 decks
10%synergy
Ravenform
10%inclusion60 decks592 decks
6%synergy
Ezuri's Predation
10%inclusion57 decks592 decks
2%synergy
Bala Ged Recovery
9.0%inclusion53 decks592 decks
-1%synergy
Broken Bond
8.4%inclusion50 decks592 decks
4%synergy
Doppelgang
8.1%inclusion48 decks590 decks
2%synergy
Preordain
7.8%inclusion46 decks592 decks
0%synergy
Preposterous Proportions
7.8%inclusion30 decks387 decks
6%synergy
Ponder
7.3%inclusion43 decks592 decks
0%synergy
Spitting Image
6.9%inclusion41 decks592 decks
5%synergy
Overrun
6.9%inclusion41 decks592 decks
5%synergy
Triumph of the Hordes
6.4%inclusion38 decks592 decks
3%synergy
Regrowth
6.1%inclusion36 decks592 decks
2%synergy
Croaking Counterpart
5.6%inclusion33 decks592 decks
1%synergy
Circuitous Route
5.6%inclusion33 decks592 decks
3%synergy
Bridgeworks Battle
5.5%inclusion29 decks526 decks
1%synergy
Vastwood Surge
5.4%inclusion32 decks592 decks
4%synergy
Aggressive Biomancy
5.3%inclusion28 decks524 decks
0%synergy
Finale of Revelation
5.1%inclusion30 decks592 decks
0%synergy
Repudiate // Replicate
5.1%inclusion30 decks592 decks
3%synergy
Utility Artifacts
Swiftfoot Boots
44%inclusion258 decks592 decks
18%synergy
Helm of the Host
33%inclusion197 decks592 decks
28%synergy
Combine Chrysalis
32%inclusion191 decks592 decks
28%synergy
Lightning Greaves
27%inclusion161 decks592 decks
5%synergy
Idol of Oblivion
18%inclusion108 decks592 decks
15%synergy
Mirror Box
16%inclusion95 decks592 decks
13%synergy
Bident of Thassa
15%inclusion87 decks592 decks
7%synergy
Emerald Medallion
9.0%inclusion53 decks592 decks
6%synergy
Sapphire Medallion
7.9%inclusion47 decks592 decks
5%synergy
Eldrazi Monument
6.6%inclusion39 decks592 decks
6%synergy
Enchantments
Parallel Lives
29%inclusion174 decks592 decks
23%synergy
Garruk's Uprising
28%inclusion166 decks592 decks
12%synergy
Tribute to the World Tree
27%inclusion162 decks592 decks
21%synergy
Doubling Season
27%inclusion157 decks592 decks
17%synergy
Kindred Discovery
21%inclusion124 decks592 decks
11%synergy
Wild Growth
17%inclusion99 decks592 decks
8%synergy
Beastmaster Ascension
16%inclusion96 decks592 decks
13%synergy
Primal Vigor
15%inclusion88 decks592 decks
12%synergy
Growing Rites of Itlimoc
14%inclusion81 decks592 decks
8%synergy
Utopia Sprawl
13%inclusion79 decks592 decks
7%synergy
Wilderness Reclamation
13%inclusion77 decks592 decks
4%synergy
Ominous Seas
11%inclusion68 decks592 decks
7%synergy
Unnatural Growth
11%inclusion66 decks592 decks
8%synergy
Mystic Remora
10%inclusion60 decks592 decks
-5%synergy
Propaganda
10%inclusion60 decks592 decks
3%synergy
Kenrith's Transformation
9.3%inclusion55 decks592 decks
5%synergy
Extravagant Replication
9.1%inclusion54 decks592 decks
7%synergy
Imprisoned in the Moon
9.0%inclusion53 decks592 decks
5%synergy
Khalni Heart Expedition
8.8%inclusion52 decks592 decks
5%synergy
Exploration
7.9%inclusion47 decks592 decks
-5%synergy
Paradox Haze
7.9%inclusion47 decks592 decks
8%synergy
Verity Circle
7.3%inclusion43 decks592 decks
7%synergy
Cryptolith Rite
6.8%inclusion40 decks592 decks
4%synergy
Quest for Ula's Temple
6.3%inclusion37 decks592 decks
4%synergy
Reconnaissance Mission
5.7%inclusion34 decks592 decks
4%synergy
Asceticism
5.4%inclusion32 decks592 decks
2%synergy
Moonlit Meditation
5.3%inclusion6 decks113 decks
4%synergy
Battles
Invasion of Segovia
6.9%inclusion41 decks592 decks
6%synergy
Invasion of Zendikar
6.3%inclusion37 decks592 decks
5%synergy
Planeswalkers
Oko, Thief of Crowns
12%inclusion70 decks592 decks
5%synergy
Kiora, the Crashing Wave
10%inclusion57 decks592 decks
7%synergy
Kiora, Behemoth Beckoner
9.5%inclusion56 decks592 decks
3%synergy
Kiora, Master of the Depths
5.2%inclusion31 decks592 decks
3%synergy
Utility Lands
Reliquary Tower
51%inclusion300 decks592 decks
1%synergy
Temple of the False God
23%inclusion137 decks592 decks
8%synergy
Rogue's Passage
19%inclusion115 decks592 decks
-2%synergy
Mosswort Bridge
19%inclusion115 decks592 decks
2%synergy
Mystic Sanctuary
12%inclusion72 decks592 decks
0%synergy
Yavimaya, Cradle of Growth
9.5%inclusion56 decks592 decks
-13%synergy
Castle Garenbrig
8.8%inclusion52 decks592 decks
4%synergy
Command Beacon
8.6%inclusion51 decks592 decks
5%synergy
Alchemist's Refuge
8.4%inclusion50 decks592 decks
-9%synergy
Lumbering Falls
8.3%inclusion49 decks592 decks
2%synergy
Restless Vinestalk
7.6%inclusion45 decks592 decks
2%synergy
Three Tree City
7.6%inclusion38 decks502 decks
2%synergy
Castle Vantress
7.1%inclusion42 decks592 decks
0%synergy
Boseiju, Who Endures
6.4%inclusion38 decks592 decks
-16%synergy
Mistrise Village
6.2%inclusion13 decks210 decks
-4%synergy
Otawara, Soaring City
5.2%inclusion31 decks592 decks
-14%synergy
Evendo, Waking Haven
5.1%inclusion6 decks117 decks
0%synergy
Mana Artifacts
Sol Ring
86%inclusion511 decks592 decks
6%synergy
Arcane Signet
71%inclusion423 decks592 decks
9%synergy
Simic Signet
46%inclusion274 decks592 decks
14%synergy
Thought Vessel
34%inclusion199 decks592 decks
13%synergy
Talisman of Curiosity
29%inclusion169 decks592 decks
7%synergy
Commander's Sphere
19%inclusion112 decks592 decks
11%synergy
Fellwar Stone
12%inclusion69 decks592 decks
2%synergy
Decanter of Endless Water
8.3%inclusion49 decks592 decks
3%synergy
Mind Stone
8.3%inclusion49 decks592 decks
4%synergy
Thran Dynamo
7.8%inclusion46 decks592 decks
5%synergy
Lands
Island
96%inclusion568 decks592 decks
0%synergy
Forest
96%inclusion567 decks592 decks
0%synergy
Command Tower
85%inclusion501 decks592 decks
-1%synergy
Simic Growth Chamber
55%inclusion326 decks592 decks
7%synergy
Hinterland Harbor
55%inclusion325 decks592 decks
-5%synergy
Yavimaya Coast
50%inclusion295 decks592 decks
-3%synergy
Temple of Mystery
46%inclusion270 decks592 decks
8%synergy
Vineglimmer Snarl
43%inclusion252 decks592 decks
4%synergy
Dreamroot Cascade
39%inclusion231 decks592 decks
-3%synergy
Flooded Grove
38%inclusion227 decks592 decks
-3%synergy
Evolving Wilds
33%inclusion197 decks592 decks
8%synergy
Myriad Landscape
32%inclusion187 decks592 decks
10%synergy
Rejuvenating Springs
31%inclusion185 decks592 decks
-13%synergy
Thornwood Falls
30%inclusion178 decks592 decks
12%synergy
Exotic Orchard
27%inclusion158 decks592 decks
3%synergy
Tangled Islet
27%inclusion157 decks592 decks
10%synergy
Terramorphic Expanse
24%inclusion143 decks592 decks
4%synergy
Breeding Pool
23%inclusion135 decks592 decks
-23%synergy
Rimewood Falls
21%inclusion124 decks592 decks
12%synergy
Barkchannel Pathway
20%inclusion117 decks592 decks
0%synergy
Simic Guildgate
19%inclusion110 decks592 decks
8%synergy
Overflowing Basin
17%inclusion95 decks571 decks
-3%synergy
Waterlogged Grove
15%inclusion88 decks592 decks
-6%synergy
Path of Ancestry
14%inclusion82 decks592 decks
-3%synergy
Blighted Woodland
13%inclusion74 decks592 decks
5%synergy
Willowrush Verge
11%inclusion30 decks280 decks
-6%synergy
Hedge Maze
11%inclusion63 decks591 decks
-9%synergy
Misty Rainforest
10%inclusion62 decks592 decks
-21%synergy
Fabled Passage
10%inclusion60 decks592 decks
-4%synergy
Littjara Mirrorlake
10%inclusion58 decks592 decks
6%synergy
Botanical Sanctum
10%inclusion57 decks592 decks
-3%synergy
Bala Ged Recovery
9.0%inclusion53 decks592 decks
-1%synergy
Woodland Stream
8.6%inclusion51 decks592 decks
3%synergy
Quandrix Campus
7.6%inclusion45 decks592 decks
1%synergy
Glasspool Mimic
7.3%inclusion43 decks592 decks
3%synergy
Snow-Covered Forest
7.1%inclusion42 decks592 decks
0%synergy
Snow-Covered Island
7.1%inclusion42 decks592 decks
0%synergy
Sink into Stupor
6.3%inclusion33 decks526 decks
-5%synergy
Lush Oasis
5.9%inclusion33 decks555 decks
0%synergy
Bridgeworks Battle
5.5%inclusion29 decks526 decks
1%synergy
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