Hmmm... So this is a possibly more powerful Lycanthropy (scratch that, it IS more powerful. It comes from the same element as the creature, it can be used MULTIPLE times in a game, and the creature initially has a heck of a lot of health.), and it depends on the number of creatures on the field. It's weaker than an attack-based "swarm" passive, because it has to be activated... Still not balanced. Something's gotta be changed, I'm just not sure what.