Really, cause I like the last variant least. Seems to remove all the potential uses of the card. You have to outright trash a card from your hand. You can't drain provinces now without a huge huge lead, and well, accelerating the end game is moot at that point anyway. You can't trash supply engine components without killing your own engine. You'd mostly use this to trash coppers and estates then, but really then the supply trash is useless and a single card no benefit trasher has to be terrible.
I do like the original idea though. Very situational, but hey it's a $3 card so that's fine. And it can have some interesting strategic choices. Though I think it may need to be balanced. Outright province trashing is potentially very strong for the player in the lead. At least remodel, salvager et al have to connect with another province.