Supplies - A $2-cost Peddler, this is so straightforwardly good, it hurts me. I've always argued that the disadvantage of duration draw is that the card stays out and skips shuffles more often. Well Supplies doesn't even have that problem. I don't like it.
Scrap - It seems decent at trashing estates. +$ and +draw puts it between Masquerade and Priest, and the silver/horse options mean you can defer the bonus to later instead of now. Otherwise, it doesn't seem like there are very many things you're happy to trash. For example, trashing a silver and gaining a silver is like spending two cards to play a Pawn. I think after estates, its main strength is flexibility.
Livery - Seems like a power card--decent if you get even just one horse, and potentially amazing if you get more. And imagine relying on only this for draw, it's so awkward and limited. I love cards like this.