Midnight Swarm

Flying, swarm (Whenever Midnight Swarm would
take damage, prevent that damage, then remove a
+1/+1 counter for each point of damage prevented.)
Whenever you remove a +1/+1 counter from
Midnight Swarm, create a 1/1 black Bat creature
token with flying.
Midnight Swarm enters the battlefield with
X +1/+1 counters.