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 - $0.90
Lightly Played - $0.70
Moderately Played - $0.60
Heavily Played - $0.50
Damaged - $0.50
Near Mint Spanish - $0.90
Lightly Played Spanish - $0.70
Moderately Played Spanish - $0.60
Heavily Played Spanish - $0.50
Damaged Spanish - $0.50