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 - $3.500
Lightly Played - $2.800
Moderately Played - $2.400
Heavily Played - $2.100
Damaged - $1.800
Near Mint Spanish - $3.500
Lightly Played Spanish - $2.800
Moderately Played Spanish - $2.400
Heavily Played Spanish - $2.100
Damaged Spanish - $1.800