Pariah of Bolas

Afflict 5 (Whenever this creature becomes blocked, defending player loses 5 life.)
Whenever a planeswalker named Bolas enters the battlefield under your control, you may return Pariah of Bolas from any graveyard to the battlefield under your control.
Whenever Pariah of Bolas deals combat damage to a player, sacrifice it at the beginning of your next main phase.