Lazav, the Ass Blinker

Whenever a creature card is put into a graveyard from anywhere, you may pay {2}. If
you do, exile Lazav, the Ass Blinker, then
return it to the battlefield as a copy of target creature in any graveyard, except its name is Lazav, the Ass Blinker, it's legendary in addition to its other types, and it has this ability.
It gains haste if the creature not entered in any graveyard this turn.