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 - £1.10
Lightly Played - £1.00
Moderately Played - £0.80
Heavily Played - £0.60
Damaged - £0.40
Near Mint Non English - £1.10
Lightly Played Non English - £1.00
Moderately Played Non English - £0.80
Heavily Played Non English - £0.60
Damaged Non English - £0.40