I changed the nerf. Honestly though, I don't think it would be broken. Chapel certainly isn't...
Chapel certainly is! chapel is possibly the most overpowered card in the game. it could cost 4$ and would still be good.
good design is to not look at balance, but at fun factor when pricing a card, that's why chapel costs 2$. if it cost 4$, it would still be bought (you can still open silver/chapel), but it would be less fun.
Just like chapel, your card wouldn't break
the game at 0$, because all it does is trash other cards, but it would make a lot of other cards really bad, like lookout, forager, trade route, trading post, and some others.
your new version is the other extreme, it's really weak. Even just "when you gain this, gain a curse" is more of a drawback than "-1 VP".
you're not the first one who suggests a trasher that junks yourself at gain. There is probably a way to make it balanced, but I doubt there's a way to make it exciting. At this point, when you make a trasher, you probably need to come up with something new.