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.)
NM-Mint - $2.90
NM-Mint Non English - $2.90
Lightly Played - $2.70
Lightly Played Non English - $2.70
Moderately Played - $2.60
Moderately Played Non English - $2.60
Heavily Played - $2.30
Heavily Played Non English - $2.30
Damaged - $1.90
Damaged Non English - $1.90