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 - $4,000
Lightly Played - $3,200
Moderately Played - $2,800
Heavily Played - $2,400
Damaged - $2,000
Near Mint Spanish - $4,000
Lightly Played Spanish - $3,200
Moderately Played Spanish - $2,800
Heavily Played Spanish - $2,400
Damaged Spanish - $2,000