Carrion Swarm

Flying
Whenever a creature an opponent controls dies you may pay {1}, if you do create a token that's a copy of Carrion Swarm.
Carrion Swarm get +1/+1 if you control 3 or more creatures named Carrion Swarm.
Carrion Swarm has Menace if you control 5 or more creatures named Carrion Swarm.
Once the feast begins, it's only a matter of time before the Swarm.