Nefero the Ghoulblight

({p/b} can either be paid with {b} or 2 life.)
Flying
Whenever a creature you control attacks, you may
pay {4}{p/b}{p/b}. If you do, sacrifice that creature,
then put this creature card from your graveyard
onto the battlefield tapped an attacking.
{p/b}{p/b}{p/b}: Nefero the Ghoulblight gains infect
until end of turn.