This is by FAR the fastest mutation deck I know of, but couldn't find it in Google Search, so I decided to post it here.
4vj 4vj 4vj 4vj 4vj 4vj 4vk 4vk 4vk 4vk 4vk 4vk 5l9 5l9 5l9 5l9 5l9 61o 61o 61o 61o 61o 61o 61o 61o 61r 61r 61r 61r 61r 8pj
Play Novas, play photons and cast Mutation on them. If you do not have a Photon in your hand, wait for 3 Novas and play them together to get Singularity. Mutate it immediately. If you get a good mutant, Parralel Universe it or wait for another mutant unless the opponent has a good creature to copy.