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

Flavor text

"A regression to ancient forms? A glimpse of future evolutions? Or a fleeting alteration of the present?" —Vorel of the Hull Clade

Card details

Printing, type line, and catalog data

Identity & printing

Card ID: DSC-214--normal
Name: Biomass Mutation
Number: 214
Rarity: Rare

Type line & Magic stats

Types: Instant
Mana cost: {X}{G/U}{G/U}
Mana value: 2

Set, artist & references

Artist: Dan Murayama Scott
Language: English
Set name: Duskmourn: House of Horror Commander
Game name: Magic: The Gathering

Battle

Abilities, attacks, weakness & resistance

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Biomass Mutation

Overview

Rules

Rulings