Raviel, Lord of Phantasms

As an additional cost to cast this spell,
sacrifice three creatures.
Flying
Whenever an opponent casts a creature spell,
create a 1/1 blue and black Demon Illusion
creature token with: "This creature can't attack".
Sacrifice a creature: Raviel gains +X/+0 until
the end of turn, where X is equal to that
creature's power.