Nimble Transformation Curses

This courses are something that the GM gives (maybe with player consent) in specific situations, they should be:

Nimble: easy (and fun!) to manage, like a little bit more than an ancestry, the GM can curse the player (with their consent maybe) and handle a card with a couple of rules on how to play it.
Not a class since I'd like to have something that can be inflicted and maybe one day cured
It needs a power + drawback that increase over time if not handled, player choice -> I feel the player could have fun with this but at the end should be incentivize to get rid of it through a quest. For more Twilight-Edward-Jacob-style I feel one single cool power like the ones for ancestries cold be enough, chosen at character creation.
It needs a way to be somehow randomly triggered (like all good curses) but also the player needs to have a way to control the odds

I've developed a draft with some ideas for

"WereBeasts" (wolf, boar, bear)
something for Vampires
thinking about Reanimated Corpses (like the thing from Frankenstein or Sally)
thinking about zombie-like curse
I'll leave out haunted ghost stuff since we have the whole Revenant class, but maybe a lesser version of a ghost that is now connected to your PC and need to be freed could be interesting and potentially have some cool rp interactions with the Revenant :D
I used hit die since it’s a cool resource that represent the character life force and it’s not really used a lot for other stuff.