Kethek, Crucible Goliath

るつぼのゴライアス、ケテク (Kethek, Crucible Goliath) (ja)

Legendary Creature - Phyrexian Beast | Power/Toughness: 4 / 4 (CMC 4)
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.