I like it. It covers similar ground to Scrying Pool but it's more subdued. Would probably be ok at $4 since in order to really get it going you need cantrips, villages, and $, and that's a lot of peripheral cards. Even with a card that would work amazingly with it like Peddler, you still need a village on the board.
Perhaps, if you're looking for a $5, give it a Trade token effect that can help sway the deck in your favour, or set up the megaturn. That could mean gaining, trashing, sifting, many effects.
Alternatively a Reaction that could enhance its potential as a "junk proof" card; "When you gain a Victory or Curse card, you may reveal this. If you do, put it in your hand." Making it encourage early greening even more would help differentiate it from Scrying Pool.