Insect Swarm

Create Swarm 0 (Sacrifice this and 1 or more
creature with create swarm: Create an Insect
Swarm Token with 0 Swarm counters. Transfer
all swarm counters to new token.)
Swarming (This creatures power a toughness is
equal to the number of swarm counters on this
creature. If this creature would be killed, instead
remove a swarm counter from it. Sacrifice this creature if there are no
swarm counters on it.)