Lucifer, Lord of the Prideful

Flying
Whenever a source an opponent controls deals
damage that player gains one life. If the source
was a creature, tap that creature. It does not
untap during its controller's next untap step.
At the end of each opponent's end step, Lucifer,
Prideful Lord deals damage to that player or a
permanent he/she controls equal to the amount
of life he/she gained that turn.