Kethek, Crucible Goliath (Phyrexia: All Will Be One 465) - Step & Compleat Foil - Rare Magic: The Gathering Card

At the beginning of your end step, you may sacrifice another creature. If you do, reveal cards from the top of your library until you reveal a nonlegendary creature card with lesser mana value, put it onto the battlefield, then put the rest on the bottom of your library in a random order.