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 - £1.80
NM-Mint Non English - £1.80
Lightly Played - £1.70
Lightly Played Non English - £1.70
Moderately Played - £1.50
Moderately Played Non English - £1.50
Heavily Played - £1.30
Heavily Played Non English - £1.30
Damaged - £1.10
Damaged Non English - £1.10