Ripper Swarm (Swarm Shambler)

Ripper Swarm enters the battlefield with a +1/+1
counter on it.

Whenever a creature you control with a +1/+1
counter on it becomes the target of a spell an
opponent controls, create a 1/1 green Insect creature
token.

{1}, {t}: Put a +1/+1 counter on Ripper Swarm.