Haunt (When this creature dies, exile it haunting target creature.)

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

The creature that the Obzedat, Deathless Council is haunting has extort.

Whenever a creature you control or the creature that the Obzedat is haunting dies, you gain 2 life and draw two cards, and each opponent loses 2 life and mills two cards.