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.
Near Mint - $3.10
Lightly Played - $2.80
Played - $2.20
Heavily Played - $1.90
Damaged - $1.60
Near Mint Non-English - $3.10
Lightly Played Non-English - $2.80
Played Non-English - $2.20
Heavily Played Non-English - $1.90
Damaged Non-English - $1.60