Kethek, Crucible Goliath (Borderless Ichor Step-and-Compleat Foil) [Phyrexia: All Will Be One]

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.