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As an additional cost to cast this spell, sacrifice a creature, discard a card, or pay 4 life.
When Dusk Mangler enters the battlefield, each opponent sacrifices a creature, discards a card, and loses 4 life.
As Dusk Mangler's triggered ability resolves, each opponent, starting with the next player in turn order, chooses a creature, knowing the choices made before them. All of those creatures are sacrificed at the same time. Next, each opponent chooses a card in their hand without revealing it, and all of those cards are discarded at the same time. Then, each opponent loses 4 life.
