Moru, Lord of the Nightspan

Eminence— Whenever you lose 7 or more life in
a turn, if Moru, Lord of the Nightspan is in the
command zone or on the battlefield, create a
5/5 black Demon creature token.
Flying, trample
Exile a Demon you control: Add {b} equal to the sacrificed creature's mana value and you lose that
much life. Demons you control gain lifelink until
end of turn.