Koma, Cosmos Serpent (Commander) - Core

Alternate Names:

The Monstrous SerpentThe Monstrous Serpent

Koma, Cosmos Serpent
Rank #296
600decks
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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
17%inclusion5 decks30 decks
12%synergy
Ba Sing Se
4.5%inclusion1 decks22 decks
2%synergy
The Terror of Serpent's Pass
1.3%inclusion1 decks79 decks
1%synergy
High Synergy Cards
Whelming Wave
76%inclusion453 decks600 decks
64%synergy
Junk Winder
63%inclusion378 decks600 decks
56%synergy
Adrix and Nev, Twincasters
64%inclusion382 decks600 decks
55%synergy
Elemental Bond
56%inclusion333 decks600 decks
50%synergy
Koma, World-Eater
63%inclusion239 decks379 decks
50%synergy
Irenicus's Vile Duplication
49%inclusion291 decks600 decks
42%synergy
Serpent of Yawning Depths
44%inclusion264 decks600 decks
38%synergy
Garruk's Packleader
39%inclusion235 decks600 decks
37%synergy
Arixmethes, Slumbering Isle
50%inclusion297 decks600 decks
36%synergy
Kodama's Reach
72%inclusion434 decks600 decks
36%synergy
Top Cards
Cultivate
81%inclusion487 decks600 decks
34%synergy
Rampant Growth
72%inclusion432 decks600 decks
31%synergy
Counterspell
67%inclusion402 decks600 decks
17%synergy
Growth Spiral
66%inclusion398 decks600 decks
22%synergy
Beast Within
61%inclusion366 decks600 decks
11%synergy
Negate
56%inclusion334 decks600 decks
30%synergy
Tatyova, Benthic Druid
48%inclusion286 decks600 decks
16%synergy
Aesi, Tyrant of Gyre Strait
48%inclusion285 decks600 decks
30%synergy
Nature's Lore
45%inclusion271 decks600 decks
15%synergy
Swiftfoot Boots
45%inclusion270 decks600 decks
19%synergy
Game Changers
Seedborn Muse
10%inclusion62 decks600 decks
-5%synergy
Creatures
Spark Double
45%inclusion268 decks600 decks
35%synergy
Sakura-Tribe Elder
44%inclusion264 decks600 decks
25%synergy
Llanowar Elves
43%inclusion260 decks600 decks
16%synergy
Murkfiend Liege
43%inclusion258 decks600 decks
28%synergy
Spawning Kraken
42%inclusion253 decks600 decks
35%synergy
Slinn Voda, the Rising Deep
37%inclusion220 decks600 decks
30%synergy
Elvish Mystic
36%inclusion213 decks600 decks
11%synergy
Coiling Oracle
34%inclusion201 decks600 decks
20%synergy
Hullbreaker Horror
31%inclusion188 decks600 decks
14%synergy
Esix, Fractal Bloom
27%inclusion164 decks600 decks
23%synergy
Eternal Witness
27%inclusion160 decks600 decks
5%synergy
Octomancer
26%inclusion128 decks484 decks
22%synergy
Scourge of Fleets
26%inclusion158 decks600 decks
18%synergy
Summon: Leviathan
26%inclusion39 decks150 decks
19%synergy
Fyndhorn Elves
25%inclusion151 decks600 decks
9%synergy
Archetype of Imagination
25%inclusion150 decks600 decks
21%synergy
Sakashima the Impostor
24%inclusion146 decks600 decks
22%synergy
Nadir Kraken
23%inclusion140 decks600 decks
19%synergy
Sakashima of a Thousand Faces
23%inclusion136 decks600 decks
18%synergy
Ohran Frostfang
23%inclusion135 decks600 decks
19%synergy
Birds of Paradise
22%inclusion131 decks600 decks
-6%synergy
Reclamation Sage
22%inclusion130 decks600 decks
7%synergy
Xolatoyac, the Smiling Flood
20%inclusion117 decks600 decks
12%synergy
Enduring Vitality
19%inclusion84 decks451 decks
11%synergy
Rampaging Baloths
18%inclusion109 decks600 decks
1%synergy
Stormtide Leviathan
18%inclusion107 decks600 decks
12%synergy
Avenger of Zendikar
18%inclusion105 decks600 decks
-1%synergy
Troyan, Gutsy Explorer
17%inclusion101 decks600 decks
14%synergy
Nezahal, Primal Tide
17%inclusion100 decks600 decks
6%synergy
Curiosity Crafter
17%inclusion99 decks600 decks
13%synergy
Scute Swarm
16%inclusion94 decks600 decks
-5%synergy
Inga and Esika
14%inclusion85 decks600 decks
11%synergy
Tromokratis
14%inclusion82 decks600 decks
8%synergy
Reef Worm
14%inclusion81 decks600 decks
10%synergy
Fanatic of Rhonas
13%inclusion69 decks512 decks
8%synergy
Kiora, Sovereign of the Deep
13%inclusion80 decks600 decks
11%synergy
Starwinder
13%inclusion12 decks96 decks
6%synergy
Roaming Throne
11%inclusion68 decks600 decks
3%synergy
Saryth, the Viper's Fang
11%inclusion68 decks600 decks
10%synergy
Toski, Bearer of Secrets
11%inclusion68 decks600 decks
8%synergy
Tireless Provisioner
11%inclusion66 decks600 decks
-4%synergy
Progenitor Mimic
11%inclusion65 decks600 decks
6%synergy
Lotus Cobra
10%inclusion60 decks600 decks
-4%synergy
Enduring Curiosity
10%inclusion45 decks456 decks
7%synergy
Simic Sky Swallower
10%inclusion57 decks600 decks
5%synergy
Jaheira, Friend of the Forest
9.3%inclusion56 decks600 decks
5%synergy
Craterhoof Behemoth
8.8%inclusion53 decks600 decks
-1%synergy
Stormsurge Kraken
8.8%inclusion53 decks600 decks
4%synergy
Loot, Exuberant Explorer
8.6%inclusion32 decks373 decks
1%synergy
Shipbreaker Kraken
8.3%inclusion50 decks600 decks
5%synergy
Instants
Double Major
43%inclusion256 decks600 decks
34%synergy
Return of the Wildspeaker
37%inclusion220 decks600 decks
26%synergy
Second Harvest
35%inclusion207 decks600 decks
28%synergy
Arcane Denial
32%inclusion194 decks600 decks
10%synergy
Heroic Intervention
30%inclusion177 decks600 decks
-1%synergy
Pongify
29%inclusion176 decks600 decks
5%synergy
Simic Charm
29%inclusion174 decks600 decks
21%synergy
Rapid Hybridization
28%inclusion171 decks600 decks
2%synergy
An Offer You Can't Refuse
25%inclusion151 decks600 decks
2%synergy
Krosan Grip
25%inclusion149 decks600 decks
17%synergy
Reality Shift
23%inclusion140 decks600 decks
9%synergy
Planar Genesis
21%inclusion110 decks512 decks
11%synergy
Eureka Moment
20%inclusion121 decks600 decks
9%synergy
Snakeskin Veil
19%inclusion112 decks600 decks
13%synergy
Harrow
19%inclusion112 decks600 decks
7%synergy
Return to Nature
18%inclusion110 decks600 decks
13%synergy
Aetherize
17%inclusion100 decks600 decks
5%synergy
Brainstorm
17%inclusion99 decks600 decks
2%synergy
Nature's Claim
16%inclusion98 decks600 decks
6%synergy
Tamiyo's Safekeeping
15%inclusion90 decks600 decks
9%synergy
Voidslime
13%inclusion76 decks600 decks
8%synergy
Perplexing Test
12%inclusion71 decks600 decks
7%synergy
Decisive Denial
12%inclusion70 decks600 decks
7%synergy
Plasm Capture
12%inclusion70 decks600 decks
8%synergy
Entish Restoration
12%inclusion70 decks600 decks
2%synergy
Mystic Reflection
10%inclusion60 decks600 decks
7%synergy
Resculpt
8.5%inclusion51 decks600 decks
2%synergy
Swan Song
8.5%inclusion51 decks600 decks
-11%synergy
Saw It Coming
8.3%inclusion50 decks600 decks
7%synergy
Joint Exploration
8.2%inclusion49 decks600 decks
2%synergy
Stubborn Denial
7.7%inclusion46 decks600 decks
5%synergy
Collective Resistance
7.6%inclusion39 decks513 decks
4%synergy
Tyvar's Stand
7.3%inclusion44 decks600 decks
5%synergy
Disdainful Stroke
7.0%inclusion42 decks600 decks
5%synergy
Sublime Epiphany
6.5%inclusion39 decks600 decks
4%synergy
Cancel
6.3%inclusion38 decks600 decks
4%synergy
Fact or Fiction
6.2%inclusion37 decks600 decks
3%synergy
Sink into Stupor
6.0%inclusion31 decks513 decks
-5%synergy
Opt
6.0%inclusion36 decks600 decks
-1%synergy
Mana Drain
5.8%inclusion35 decks600 decks
-10%synergy
Archdruid's Charm
5.7%inclusion33 decks577 decks
-1%synergy
Rewind
5.5%inclusion33 decks600 decks
3%synergy
Dispel
5.3%inclusion32 decks600 decks
1%synergy
Roiling Regrowth
5.3%inclusion32 decks600 decks
1%synergy
Sorceries
Farseek
45%inclusion268 decks600 decks
20%synergy
Explore
39%inclusion235 decks600 decks
19%synergy
Three Visits
32%inclusion193 decks600 decks
9%synergy
Skyshroud Claim
31%inclusion184 decks600 decks
22%synergy
Overwhelming Stampede
27%inclusion162 decks600 decks
15%synergy
Urban Evolution
27%inclusion160 decks600 decks
17%synergy
Shamanic Revelation
25%inclusion147 decks600 decks
19%synergy
Migration Path
21%inclusion127 decks600 decks
18%synergy
Quantum Misalignment
21%inclusion126 decks600 decks
18%synergy
Rite of Replication
17%inclusion104 decks600 decks
10%synergy
Harmonize
16%inclusion97 decks600 decks
11%synergy
Search for Tomorrow
16%inclusion96 decks600 decks
11%synergy
Explosive Vegetation
16%inclusion93 decks600 decks
10%synergy
Rishkar's Expertise
15%inclusion90 decks600 decks
7%synergy
Curse of the Swine
14%inclusion82 decks600 decks
3%synergy
Distant Melody
13%inclusion80 decks600 decks
10%synergy
Ravenform
10%inclusion61 decks600 decks
6%synergy
Ezuri's Predation
10%inclusion58 decks600 decks
2%synergy
Bala Ged Recovery
9.0%inclusion54 decks600 decks
-1%synergy
Broken Bond
8.3%inclusion50 decks600 decks
3%synergy
Doppelgang
8.0%inclusion46 decks577 decks
1%synergy
Preposterous Proportions
7.8%inclusion29 decks374 decks
6%synergy
Preordain
7.7%inclusion46 decks600 decks
-1%synergy
Ponder
7.5%inclusion45 decks600 decks
0%synergy
Spitting Image
7.3%inclusion44 decks600 decks
5%synergy
Overrun
6.8%inclusion41 decks600 decks
5%synergy
Triumph of the Hordes
5.8%inclusion35 decks600 decks
3%synergy
Regrowth
5.7%inclusion34 decks600 decks
2%synergy
Bridgeworks Battle
5.7%inclusion29 decks513 decks
1%synergy
Croaking Counterpart
5.5%inclusion33 decks600 decks
1%synergy
Aggressive Biomancy
5.5%inclusion28 decks511 decks
0%synergy
Circuitous Route
5.2%inclusion31 decks600 decks
3%synergy
Quasiduplicate
5.2%inclusion31 decks600 decks
2%synergy
Vastwood Surge
5.0%inclusion30 decks600 decks
4%synergy
Repudiate // Replicate
5.0%inclusion30 decks600 decks
3%synergy
Utility Artifacts
Helm of the Host
34%inclusion204 decks600 decks
29%synergy
Combine Chrysalis
33%inclusion200 decks600 decks
29%synergy
Lightning Greaves
28%inclusion168 decks600 decks
6%synergy
Idol of Oblivion
19%inclusion113 decks600 decks
15%synergy
Mirror Box
16%inclusion98 decks600 decks
13%synergy
Bident of Thassa
15%inclusion91 decks600 decks
8%synergy
Emerald Medallion
8.7%inclusion52 decks600 decks
6%synergy
Sapphire Medallion
7.7%inclusion46 decks600 decks
5%synergy
Eldrazi Monument
6.3%inclusion38 decks600 decks
6%synergy
Kefnet's Monument
5.3%inclusion32 decks600 decks
4%synergy
Enchantments
Parallel Lives
29%inclusion176 decks600 decks
23%synergy
Garruk's Uprising
27%inclusion164 decks600 decks
11%synergy
Tribute to the World Tree
27%inclusion162 decks600 decks
21%synergy
Doubling Season
26%inclusion155 decks600 decks
16%synergy
Kindred Discovery
21%inclusion128 decks600 decks
11%synergy
Wild Growth
17%inclusion101 decks600 decks
8%synergy
Beastmaster Ascension
16%inclusion97 decks600 decks
13%synergy
Primal Vigor
15%inclusion88 decks600 decks
12%synergy
Growing Rites of Itlimoc
13%inclusion79 decks600 decks
7%synergy
Utopia Sprawl
13%inclusion78 decks600 decks
6%synergy
Wilderness Reclamation
13%inclusion78 decks600 decks
4%synergy
Ominous Seas
12%inclusion70 decks600 decks
7%synergy
Unnatural Growth
11%inclusion68 decks600 decks
8%synergy
Propaganda
10%inclusion62 decks600 decks
4%synergy
Mystic Remora
10%inclusion58 decks600 decks
-6%synergy
Kenrith's Transformation
9.3%inclusion56 decks600 decks
5%synergy
Khalni Heart Expedition
9.3%inclusion56 decks600 decks
5%synergy
Extravagant Replication
9.0%inclusion54 decks600 decks
7%synergy
Imprisoned in the Moon
8.7%inclusion52 decks600 decks
5%synergy
Paradox Haze
8.7%inclusion52 decks600 decks
8%synergy
Exploration
8.3%inclusion50 decks600 decks
-5%synergy
Verity Circle
7.3%inclusion44 decks600 decks
7%synergy
Quest for Ula's Temple
6.7%inclusion40 decks600 decks
4%synergy
Cryptolith Rite
6.5%inclusion39 decks600 decks
3%synergy
Reconnaissance Mission
5.5%inclusion33 decks600 decks
4%synergy
Moonlit Meditation
5.2%inclusion5 decks96 decks
4%synergy
Asceticism
5.2%inclusion31 decks600 decks
2%synergy
Battles
Invasion of Segovia
7.0%inclusion42 decks600 decks
6%synergy
Invasion of Zendikar
6.0%inclusion36 decks600 decks
4%synergy
Planeswalkers
Oko, Thief of Crowns
12%inclusion70 decks600 decks
5%synergy
Kiora, the Crashing Wave
10%inclusion57 decks600 decks
7%synergy
Kiora, Behemoth Beckoner
9.0%inclusion54 decks600 decks
3%synergy
Kiora, Master of the Depths
5.3%inclusion32 decks600 decks
3%synergy
Utility Lands
Reliquary Tower
52%inclusion309 decks600 decks
1%synergy
Temple of the False God
24%inclusion141 decks600 decks
8%synergy
Rogue's Passage
20%inclusion118 decks600 decks
-2%synergy
Mosswort Bridge
20%inclusion118 decks600 decks
2%synergy
Mystic Sanctuary
12%inclusion74 decks600 decks
0%synergy
Yavimaya, Cradle of Growth
9.2%inclusion55 decks600 decks
-13%synergy
Castle Garenbrig
8.7%inclusion52 decks600 decks
4%synergy
Alchemist's Refuge
8.5%inclusion51 decks600 decks
-9%synergy
Command Beacon
8.5%inclusion51 decks600 decks
4%synergy
Lumbering Falls
8.3%inclusion50 decks600 decks
2%synergy
Restless Vinestalk
7.7%inclusion46 decks600 decks
2%synergy
Three Tree City
7.6%inclusion37 decks489 decks
2%synergy
Castle Vantress
6.8%inclusion41 decks600 decks
0%synergy
Boseiju, Who Endures
6.2%inclusion37 decks600 decks
-16%synergy
Mistrise Village
6.2%inclusion12 decks195 decks
-4%synergy
Otawara, Soaring City
5.2%inclusion31 decks600 decks
-14%synergy
Evendo, Waking Haven
5.0%inclusion5 decks100 decks
0%synergy
Mana Artifacts
Sol Ring
87%inclusion521 decks600 decks
6%synergy
Arcane Signet
72%inclusion432 decks600 decks
9%synergy
Simic Signet
48%inclusion287 decks600 decks
16%synergy
Thought Vessel
33%inclusion200 decks600 decks
13%synergy
Talisman of Curiosity
29%inclusion173 decks600 decks
7%synergy
Commander's Sphere
19%inclusion116 decks600 decks
11%synergy
Fellwar Stone
11%inclusion66 decks600 decks
1%synergy
Decanter of Endless Water
8.2%inclusion49 decks600 decks
3%synergy
Mind Stone
8.2%inclusion49 decks600 decks
4%synergy
Thran Dynamo
7.8%inclusion47 decks600 decks
5%synergy
Lands
Island
96%inclusion575 decks600 decks
0%synergy
Forest
96%inclusion574 decks600 decks
0%synergy
Command Tower
85%inclusion508 decks600 decks
-1%synergy
Simic Growth Chamber
56%inclusion334 decks600 decks
7%synergy
Hinterland Harbor
54%inclusion325 decks600 decks
-5%synergy
Yavimaya Coast
50%inclusion299 decks600 decks
-3%synergy
Temple of Mystery
46%inclusion278 decks600 decks
8%synergy
Vineglimmer Snarl
42%inclusion254 decks600 decks
4%synergy
Dreamroot Cascade
39%inclusion233 decks600 decks
-3%synergy
Flooded Grove
37%inclusion223 decks600 decks
-4%synergy
Evolving Wilds
33%inclusion200 decks600 decks
8%synergy
Myriad Landscape
33%inclusion198 decks600 decks
11%synergy
Rejuvenating Springs
31%inclusion188 decks600 decks
-13%synergy
Thornwood Falls
30%inclusion182 decks600 decks
13%synergy
Exotic Orchard
27%inclusion163 decks600 decks
3%synergy
Tangled Islet
27%inclusion162 decks600 decks
11%synergy
Terramorphic Expanse
25%inclusion149 decks600 decks
5%synergy
Breeding Pool
22%inclusion134 decks600 decks
-23%synergy
Rimewood Falls
21%inclusion126 decks600 decks
12%synergy
Barkchannel Pathway
20%inclusion119 decks600 decks
0%synergy
Simic Guildgate
19%inclusion111 decks600 decks
8%synergy
Overflowing Basin
17%inclusion95 decks558 decks
-2%synergy
Waterlogged Grove
14%inclusion85 decks600 decks
-6%synergy
Path of Ancestry
14%inclusion84 decks600 decks
-3%synergy
Blighted Woodland
13%inclusion76 decks600 decks
5%synergy
Hedge Maze
10%inclusion59 decks578 decks
-9%synergy
Fabled Passage
10%inclusion61 decks600 decks
-4%synergy
Littjara Mirrorlake
10%inclusion61 decks600 decks
6%synergy
Misty Rainforest
10%inclusion60 decks600 decks
-21%synergy
Willowrush Verge
9.4%inclusion25 decks267 decks
-7%synergy
Botanical Sanctum
9.2%inclusion55 decks600 decks
-3%synergy
Woodland Stream
9.2%inclusion55 decks600 decks
4%synergy
Bala Ged Recovery
9.0%inclusion54 decks600 decks
-1%synergy
Quandrix Campus
7.7%inclusion46 decks600 decks
1%synergy
Glasspool Mimic
7.5%inclusion45 decks600 decks
3%synergy
Snow-Covered Island
6.8%inclusion41 decks600 decks
0%synergy
Snow-Covered Forest
6.8%inclusion41 decks600 decks
0%synergy
Sink into Stupor
6.0%inclusion31 decks513 decks
-5%synergy
Lush Oasis
5.9%inclusion32 decks542 decks
0%synergy
Bridgeworks Battle
5.7%inclusion29 decks513 decks
1%synergy
Tanglepool Bridge
5.2%inclusion31 decks600 decks
0%synergy
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