One way to see how truly dangerous this piece can be in a meta environment is to go through every tournament team you can find and see what piece she'd take out. It's usually a pretty good trade. I dream of running a team of her and Highfather together just to make my opponent wonder what his team can actually do anymore.

Plot twist: your opponent is using JLTW Superman with Parallax and Yellow Battery.

If she takes a character that can produce a physical Bystander Token (Rick Jones, Miss Arrowette, Nightwing), is the opposing character obligated to provide the Bystander or is it like sideline characters where the player using Copycat would have to provide their own?

Wait, so as long as you don't attack your opponent's (previously your) Copycat, they are forced to push her 4 times to get to that Regen click and just then you get her back? That's brutal!