Well that's a good point about Sage, I wasn't thinking of Sage's cycling, but just it's action of finding a card in your deck.
But seeing and reorganizing the top of your deck can be pretty helpful as well, for the obvious synergies (Wishing Well, Mystic, Herald, Golem, Doctor, Vagrant, Pawn, etc.). So you could argue that this also gets a card you want (if you were going to get it next turn) and does something else.
Maybe $3 is a good price to try it.