Valak, Marquis of Snakes

Flying
Other Demons, Devils, Imps, and Tieflings you control get+1/+1 and have lifelink.
At the beginning of each end step, if a creature
card was put into your graveyard from anywhere
this turn, create a 1/1 red Devil creature token
with "When this creature dies, it deals 1 damage
to any target."