Make a Guy Fawkes reference out of that, then?
"Remember, remember, on turn 5 you surrender..."
Tiny figure using a big rifle... heh, that would be amusing. All it has to do is create a bit of chaos to give Sizemore his opening to free Wanda.
Hmm, since Charlie rigged his portal to allow anything to pass through, wonder if he also rigged how it opens and closes?
No idea who can and cannot use it, but I'd guess it'll work for any Dirtamancer.