I Feel as of now there is not that much of a variety of mutuate cards i feel since i have a legendary life wizard he should have more access to more mutates other than a sprite to a death sprite or a banshee to a life banshee.
I also want to see what are your ideas for other mutate cards.
Here is one of my ideas: Mutate Centaur to a death centaur Instead of being a single attack the mutate would change centaur into a death DOT it would do like 100 first round then 450 over 3 rounds. It would change to a DOT since the arrow could be poisoned OR instead of death centaur a fire centaur and arrow would be a fire arrow (also a DOT)