Doomed//Repeat

Doomed {b}{b}
Target opponent loses 5 life unless they sacrifice
a creature or discard a card.
Repeat {5}{b}{b}
Aftermath (Cast this spell only from your
graveyard. Then exile it.)
Target opponent sacrifices a creature, discards a
card, puts the top 5 cards of their library into
their graveyard, then loses 5 life.