Bloatfly Swarm

Flying
Bloatfly Swarm enters the battlefield with five +1/+1 counters on it.
If damage would be dealt to Bloatfly Swarm while it
has a +1/+1 counter on it, prevent that damage,
remove that many +1/+1 counters from it, then each opponent takes one damage for each +1/+1 counter removed this way.