Void Ravager

When Void Ravager enters the battlefield, sacrifice X creatures. Then, it gains special effects for as long as it remains on the battlefield based on how many creatures you sacrificed for this ability:
1+: Flying
3+: Menace, Trample
5+: Hexproof, {c}{c}: this creature gets +2/+0 until end of turn.
7+: Annihilator 2