Kroxa, Titan of Death’s Hunger

When Kroxa enters the battlefield, sacrifice it unless it escaped.
Whenever Kroxa enters the battlefield or attacks, each opponent discards a card, then each opponent who didn't discard a nonland card this way loses 3 life.
Escape {b}{b}{r}{r}, Exile five other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)