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 - $1.00
NM-Mint Non English - $1.00
Lightly Played - $0.90
Lightly Played Non English - $0.90
Moderately Played - $0.90
Moderately Played Non English - $0.90
Heavily Played - $0.80
Heavily Played Non English - $0.80
Damaged - $0.70
Damaged Non English - $0.70