Screeching Pits

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
Whenever a Horror you control attacks, each player exiles a card from his or her graveyard,
then each player with no cards in his or her graveyard loses 1 life.
When seeking for serenity, the Sultai usually comes to the graveyard. It's the only place that's not crowded with dead corpses.