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

„Ein Rückschritt zu uralten Erscheinungsformen? Ein kurzer Blick auf künftige Evolutionen? Oder eine flüchtige Veränderung der Gegenwart?"
—Vorel von der Hülsenklade

Mutierende Biomasse

Kreaturen, die du kontrollierst, haben Basis-Stärke und -Widerstandskraft X/X bis zum Ende des Zuges.

"¿Una regresión a las viejas costumbres? ¿Un indicio de evoluciones futuras? ¿O una fugaz alteración del presente?".
—Vorel del Clado de la Vaina

Mutación de la biomasa

Las criaturas que controlas tienen una fuerza y resistencia base de X/X hasta el final del turno.

« Régression vers d'anciennes formes ? Avant-goût d'évolutions futures ? Ou altération fugace de l'instant présent ? »
—Vorel du Cladus Coque

Mutation de biomasse

Les créatures que vous contrôlez ont une force et une endurance de base de X/X jusqu'à la fin du tour.

"Una regressione ad antiche forme? Un assaggio di evoluzioni future? O un'instabile alterazione del presente?"
—Vorel del Clade del Carapace

Mutazione della Biomassa

Le creature che controlli hanno forza e costituzione base X/X fino alla fine del turno.

「太古の姿への先祖返りか？来たる進化の兆候か？それとも現在が束の間の変化を見せているのか？」
――育殻組のヴォレル

生体材料の突然変異

ターン終了時まで、あなたがコントロールしているすべてのクリーチャーの基本のパワーとタフネスはＸ/Ｘになる。

Biomass Mutation

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

Duskmourn: House of Horror Commander

Vault 87's Evolutionary Experimentation Program exposed subjects to an airborne version of FEV. Rapid physical enhancements accompanied sharp mental regression, and the oldest mutants would become almost feral.

Fallout

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.