When Lazav, the Multifarious enters the battlefield, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.) {X}: Lazav, the Multifarious becomes a copy of target creature card in your graveyard with converted mana cost X, except its name is Lazav, the Multifarious, it's legendary in addition to its other types, and it has this ability.