What's the adjective for mutationism? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs mutate and mutagenize which may be used as adjectives within certain contexts.
mutant
Of, relating to, undergoing (i.e. mutating), or resulting from change or mutation; that has undergone mutation.
“The result is a mutant blend of everything and anything that has been produced by the music industry these last 30 years.”
“He makes a deal with an interdimensional being to gain the ability to bring her back from the dead at the cost of bringing her back as a deformed mutant beast.”