Astel, Naturalborn of the Void

Whenever Astel, Naturalborn of the Void attacks, exile up to two target creatures. Their controllers may discard a card for each creature exiled this way. If they don’t, they lose 4 life.

{3}{u}{b}, Sacrifice a creature: Return Astel, Naturalborn of the Void to its owner's hand, then each opponent sacrifices a permanent.

Whenever an opponent discards a card, you may pay {1}. If you do, create a tapped Treasure token.