Manifest the top card of your library, then put X +1/+1 counters on it. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)
Near Mint - $2.40
Lightly Played - $2.00
Moderately Played - $1.70
Heavily Played - $1.30
Damaged - $1.00
Near Mint French - $2.40
Lightly Played French - $2.00
Moderately Played French - $1.70
Heavily Played French - $1.30
Damaged French - $1.00