What are we going to call it?

"Evolutionary", perhaps. Though it looks like it'd be a better design to only allow you to do it once. There are so very few cards that'll be able to do more with this than a single hit. (And I say this as the designer of the Magic Turing Machine that hits Rotlung Reanimator with two creature type changes and one colour change. It's not worth the overhead.)

Annoyingly, Splicer's Skill exists. I think in practice you just ignore that, and print, say, Hour of Promise with

> Evolutionary (You may pay an additional any number of times as you cast this spell. For each time, change Desert to another nonbasic land type, Zombie to another creature type or black to another colour.)

even though teeechnically someone could also add Phyrexian or Golem to the list of changeable types.

Evolve captured evolution better than this. Adaptation seems a more appropriate choice of word. Though adapt existing as a keyword might dissuade you from that one as well.

Meh, evolution covers a lot of things that Evolve mechanically doesn’t capture.
I do think evolution as a word does work better on creatures, and I have no card references for how this mechanic would appear. There’s a stigma that evolution should be permanent, or at least something for a foreseeable amount of time (until of course, further evolution changes the subject). Note, that evolution could be argued in then case of things being designed by otherwise altered in society, (e.g. the evolution of vehicular combat) though my gut tells me that such is not the case here.
Anyway, I would suggest Diversify.

"Revision"