Angrath, the Flame-Chained [Rivals of Ixalan Prerelease Promos]

+1: Each opponent discards a card and loses 2 life.
−3: Gain control of target creature until end of turn. Untap it. It gains haste until end of turn. Sacrifice it at the beginning of the next end step if it has converted mana cost 3 or less.
−8: Each opponent loses life equal to the number of cards in their graveyard.