Sebastian, Grave Breaker

+2: Put the top 3 cards of your library into your graveyard, target creature gets -X/-X for each creature put into the graveyard this way.
-3: Target player sacrifices a creature or Planeswalker, if they cannot, they discard a card.
-9: You get an Emblem with "Creatures your opponents control lose -X/-X where X is the number of creatures in your graveyard."