A quick idea i got: Faithful hound meets band of misfits. It's probably pretty weak without its reaction, which is why i added it.
I think this is strongest late game, when you have a lot of douchys or provinces. But early game, you might want two or three if there is no thinning.
This probably likes sifters a lot, and village Green of course. I imagine that it should combo with faithfoul hound a bit.
Edit 2: (v7)
On play ability has been buffed: You can now, for example, discard a douchy and play a powerful 5$ card. Andon some boards with a 2$ card on them, you might want to get a scribe to exile a copper or estate, and then you can play scribe on an estate to play an 2$.
Added an "When you gain this, you may exile a card in hand". I think this is unique for the card, (the closest equivalent being mints "trash all treasures in play when bought" effect).
very late game, you might want to buy a Srcribe over and estate as you could exile a victory card in hand. This should also give workshops a sort of unique thinning on the boards it's on.
Edit 3: Gambit thought the card was too busy, and editing it further, I think I agree: I removed the treasure part and changed the language a bit on the bottom. I think it looks better like this, while still keeping the spirit of the bottom changes
Edit 4: added "reveal" to the bottom part to have accountability.