I was actually trying to help someone else answer a question for choosing a random animation. If there was a count expression you could simply do Play Animation: "Animation"&ceil(random(0, AnimationCount)) and name them Animation1, Animation2, etc.
Yes, it is not that useful, as opposed to just counting yourself, but I always appreciate it when setup to avoid manual input and oversight, when adding/removing animations in this case.
More specifically was thinking Idle animations so add a folder for all the Idle animations and name them Idle1, Idle2, etc and find a way to do a count for the animations in that folder