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 - $2.30
Lightly Played - $2.10
Moderately Played - $1.80
Heavily Played - $1.60
Damaged - $1.20
NM-Mint Non English - $2.30
Lightly Played Non English - $2.10
Moderately Played Non English - $1.80
Heavily Played Non English - $1.60
Damaged Non English - $1.20