Balrog Di Celebdil

Flying, Protection from Artifacts, Indestructible
When this creature enters the battlefield, Exile all
other creatures except Maiar creatures, Mages,
and Demons. Each time X combat damage is
dealt to this creature, deal X damage - 2 to any
target. If this creature leaves the battlefield, target
player gains life, equal to this creature's power
{x}{b/r}:Deal X damage to target creature, or X
damage divided by 2 to target planeswalker, or
X damage divided by 3 to target player