Biomass Mutation card art

Biomass Mutation

Instant MV 2

Tracked across real Commander games played through TurnZero HQ.

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What it doesRulingsIn the 99Every version

What it does

Creatures you control have base power and toughness X/X until end of turn.

Rulings

2 official rulings, in the order Wizards published them.

  • 2013-01-24

    Biomass Mutation overwrites any effects that set the power and/or toughness of a creature you control to a specific value. Effects that modify power and/or toughness but don't set them to a specific value (like the one created by Giant Growth), power/toughness changes from counters, and effects that switch a creature's power and toughness will continue to apply. For example, say you control a 1/1 creature that's getting +4/+2 from an Aura, has a +1/+1 counter on it, and is affected by an effect that switches its power and toughness. This creature is 4/6. If you cast Biomass Mutation with X equal to 4, the creature would become 7/9 (4/4, +4/+2 from the Aura, +1/+1 from the counter, then switch power and toughness).

  • 2013-01-24

    Choosing 0 as the value for X will likely cause creatures you control to become 0/0 and be put into the graveyard.

Rulings are Wizards of the Coast's own, mirrored from Scryfall and refreshed nightly.

In the 99

Every deck whose current list includes Biomass Mutation, whatever its commander.

Decks running it 2
Games played 0
Win rate — Fewer than 5 completed games — not enough to publish a rate yet.
Confirmed on board 0 Games where a board photo caught it actually in play.

Most played under

Commander Decks Games Win rate
Zimone, Infinite Analyst 1 0 —
Zimone, Mystery Unraveler 1 0 —

Colors it shows up in

  • Simic 2 decks

Every version of Biomass Mutation

10 printings, newest first. Prices are the market figures Scryfall publishes, refreshed nightly — a printing with no figure shows a dash rather than a zero, because Scryfall genuinely publishes none for some of them.

Prices from Scryfall, which tracks the TCGplayer and Cardmarket markets. They move daily and are a guide rather than a quote. Search TCGplayer for Biomass Mutation — a name search across every version, for the printings TCGplayer publishes no direct link to.

Aggregated from Commander games tracked in TurnZero HQ. Every figure counts decks and games only — no individual deck list, player or playgroup is identified. Win rates are withheld below 5 completed games, where the sample is too small to mean anything.