At the beginning of you r second main phase, look at the top X cards of your library, where X is the total amount of life your opponent lost this turn. Exile one of those cards and put the rest on the bottom of your library in a random order. You may play the exile card this turn.
Near Mint - £0.20
Lightly Played - £0.20
Moderately Played - £0.20
Heavily Played - £0.10
Damaged - £0.10
Near Mint Non English - £0.20
Lightly Played Non English - £0.20
Moderately Played Non English - £0.20
Heavily Played Non English - £0.10
Damaged Non English - £0.10