Yesterday I played with SoSe which gave me a Fallen Elf, and I had a FFQ on field. Although the Fallen Elf was unupped, the mutation still had high chance to give me abomination which was stronger than the Fireflies. Then the next logical move was to use Fallen Elf to mutate the Fireflies while FFQ kept producing fodders.
This makes me wonder if this is a good combo for a mutation deck, compared with the standard Cat/Boneyard-mutation-factory.
I have tried this in trainer against AI3 but I haven't got a decent result, because I sucks in making Trio.