Belzadic, Vindictive Stalwart

Spirits you control have haunt. (When those
creatures die, exile them haunting target creature.)
At the beginning of your upkeep, each opponent
loses 1 life for each haunted creature that player
controls. You gain life equal to the life lost this
way.
Whenever a haunted creature dies, you may pay {w}{b}. If you do, return each creature haunting it
to its owner's hand.