At the beginning of your end step, you may sacrifice a creature. If you do, look at the top X cards of your library, when X is that creature's mana value. You may put a creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.
NM-Mint - $4.90
Lightly Played - $4.70
Moderately Played - $4.40
Heavily Played - $4.00
Damaged - $3.20
NM-Mint Non English - $4.90
Lightly Played Non English - $4.70
Moderately Played Non English - $4.40
Heavily Played Non English - $4.00
Damaged Non English - $3.20