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Koma, Cosmos Serpent

Legendary Creature — Serpent

This spell can't be countered.
At the beginning of each upkeep, create a 3/3 blue Serpent creature token named Koma's Coil.
Sacrifice another Serpent: Choose one —
• Tap target permanent. Its activated abilities can't be activated this turn.
• Koma gains indestructible until end of turn.

CMC
7
Mana cost
{3}{G}{G}{U}{U}
Color identity
GU
Rarity
mythic
Set
Magic Online Promos
Price
—
EDHREC rank
#1355
Buy on TCGplayer
Koma, Cosmos Serpent card art
Koma, Cosmos Serpent hits the table as a self-replacing, tap-locking engine — seven mana gets you a 6/6 that generates a free Serpent token every upkeep and lets you sacrifice any Coil token to either lock down a permanent or make itself indestructible. The cost is real: seven mana in two colors means you need a ramp-heavy shell to deploy it consistently, which is exactly why Kenessos, Priest of Thassa cheats it into play from the top of the library and Esix, Fractal Bloom copies the tokens it generates.

Best Commanders

Commanders with the highest synergy

01
Kenessos, Priest of Thassa

Kenessos, Priest of Thassa

85.4% of decks · synergy 0.70

Kenessos, Priest of Thassa skips the seven-mana ask entirely — Koma, Cosmos Serpent is the premier Serpent target for Kenessos's triggered ability, landing into play from the top of the library whenever a Serpent connects. At 85% inclusion across Kenessos decks, it's essentially a staple.

03
Koma, World-Eater

Koma, World-Eater

64.6% of decks · synergy 0.49

Koma, World-Eater pairs with Koma, Cosmos Serpent as the obvious lore-and-function partner — the Coil tokens the Cosmos Serpent generates slot directly into World-Eater's sacrifice and devouring mechanics. Running both lets the deck operate as a Koma tribal engine.

04

Peter Parker

50.8% of decks · synergy 0.44

Peter Parker wants large, threatening creatures that generate value the moment they enter, and Koma, Cosmos Serpent delivers exactly that — a 6/6 that immediately begins producing tokens fits comfortably alongside other big threats Peter Parker cheats into play or copies.

05
Adrix and Nev, Twincasters

Adrix and Nev, Twincasters

48.8% of decks · synergy 0.34

Adrix and Nev, Twincasters double every Serpent Coil token Koma, Cosmos Serpent creates, turning one free token per upkeep into two and rapidly stacking the tap-or-indestructible activations. That token doubling compresses the timeline from slow attrition to full board lock.

Format Analysis

Where it lives, where it can’t

FormatVerdict
commander legal
legacy legal
modern legal
pioneer legal
standard not legal
vintage legal
pauper not legal
oathbreaker legal

Commander is the native habitat for Koma, Cosmos Serpent — the legendary typing is irrelevant here, the seven-mana cost is manageable in a format with Sol Ring and mana dorks, and the tap-lock ability is devastating in multiplayer where opponents run out of responses. In Legacy and Vintage it's technically legal but purely unplayable; seven mana is a non-starter in formats where games end on turn two or three. Modern and Pioneer are the more interesting cases: Koma, Cosmos Serpent has occasionally shown up in Simic ramp shells, and the indestructible protection makes it resilient to the removal those formats lean on, but the mana cost still strains most competitive mana bases. Oathbreaker is a fine home for it as a spell, especially under a planeswalker that ramps.

Key Combos

Combo lines featuring this card

Price Context

Current price

unknown tier

Pricing data for Koma, Cosmos Serpent isn't available in the current feed — check Scryfall or your preferred retailer for the live number. Given its consistent 80%+ inclusion rate across multiple Serpent and sea-creature commanders, it doesn't historically sit in bulk territory; expect a moderate singles price reflecting real demand.

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Sources

Mentioned

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Updated . Data from Scryfall, EDHREC, and Commander Spellbook.