Thanks for the feedback! I’ll look into it being OP. The doll has a little bit of side story, but since it’s only a chance finding, I don’t want to hang too much plot or mechanics on it. Thank you again!
More specifically, last I checked it took no time to use and had no "negative" (such a subjective term for a story like this!) consequences, meaning you could use it as much as you want. Just didn't want to share too much in an open forum, trying to be spoiler conscious!