Biomass Mutation

Public decks that run Biomass Mutation

• Faceless Menace - Commander 2019, led by Kadena, Slinking Sorcerer
• Jump Scare! - Duskmourn: House of Horror Commander, led by Zimone, Mystery Unraveler
• Mutant Menace - Fallout, led by The Wise Mothman
• Quandrix Unlimited - Secrets of Strixhaven, led by Zimone, Infinite Analyst
• Quantum Quandrix - Commander 2021, led by Adrix and Nev, Twincasters

Commanders that run Biomass Mutation most

Deck counts from EDHREC.

• Zimone, Infinite Analyst: 5,005 decks
• The Wise Mothman: 4,119 decks
• Zaxara, the Exemplary: 3,463 decks
• Zimone, Mystery Unraveler: 1,772 decks
• Xyris, the Writhing Storm: 1,751 decks
• Edric, Spymaster of Trest: 1,596 decks
• Kadena, Slinking Sorcerer: 1,488 decks
• Adrix and Nev, Twincasters: 930 decks

Often played with Biomass Mutation

Cards that show up in the same decks on EDHREC.

• Soltari Foot Soldier
• Protect the Negotiators
• Bess, Soul Nourisher
• Rabble Rousing
• Mire in Misery
• Young Deathclaws
• Zephyr Sprite
• Cloud Sprite
• Treetop Scout
• Entrancing Melody

Rulings

• 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.