Kethek, Crucible Goliath (Promo Pack) [Phyrexia: All Will Be One Promos] Foil

At the beginning of your end step, you may sacrifice another creature. If you do, reveal cards from the top of your library until your 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.