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.
NM-Mint - $0.40
Lightly Played - $0.40
Moderately Played - $0.40
Heavily Played - $0.40
Damaged - $0.30
NM-Mint Non English - $0.40
Lightly Played Non English - $0.40
Moderately Played Non English - $0.40
Heavily Played Non English - $0.40
Damaged Non English - $0.30