Vistal, the Blightscaled

Delve
Vistal, the Blightscaled enters the battlefield
with X +1/+1 counters on it. If X is equal to
5 or greater, put X -1/-1 counters on each other
creature on the battlefield.
{g}{b}, Remove X +1/+1 counters from Vistal,
the Blightscaled: Put X -1/-1 counters on other
creature without a -1/-1 counter on it.