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 Foil - £0.50
Lightly Played Foil - £0.50
Moderately Played Foil - £0.40
Heavily Played Foil - £0.30
Damaged Foil - £0.20
Near Mint Foil Non English - £0.50
Lightly Played Foil Non English - £0.50
Moderately Played Foil Non English - £0.40
Heavily Played Foil Non English - £0.30
Damaged Foil Non English - £0.20