Nanomachine Virus

Destroy target creature. Flip a coin. If heads, regenerate the creature, it becomes a mutant in addition to its other creature types, and gets +4/-4 until end of turn. If tails, its owner creates a 3/3 black and blue mutant horror creature token.

“Most reacted poorly to the nanovirus. They couldn’t handle the changes to their bodies. Although it did heal their wounds, they eventually died. You were the only one who survived, and even then, you were changed.” -Lemia Seiju