Deathless Defiler

Null (If a creature dealt damage by Deathless Defiler this turn would die, exile it instead.)
Deathless Defiler can't block.
{b}{b}, pay 2 life: Return Deathless Defiler from your graveyard to the battlefield. Activate this ability only any time you could cast a sorcery and only if an opponent owns four or more cards in exile.