If a creature that triggered Evolve is gone by the time the trigger resolves, the trigger just uses the last known information about that creature's P/T when it died. That means Doom Blade or Bile Blight will give different outcomes when responding to an Evolve trigger!
A common mistake I see newer (and some veteran!) players making is misunderstanding how a permanent's colors work. For example, I've seen many a person think that when says it destroys a nonblack creature, what that means is that the creature has to be a color that isn't black. So, by their logic, an it, because she's red! Red is nonblack, right? The problem with that line of thinking is... well, it's wrong. When something in Magic refers to a characteristic like color (or in the case of , the