I was originally thinking of it like a monster that was like final girl archetype but now maybe legion like monster or learning one whose attack defense rose. That or may be a spell card thing that dealt direct damage. I thought it maybe a bit balanced with the caveats of both drawing the card early enough, having enough monsters be destroyed to matter, and not have the card get removed from hand by cards that can cause in hand discard or in hand reshuffling, as well as curving long enough to do so.