Brutal Hydra

Brutal Hydra enters the battlefield with X
+1/+1 counters plus the number of
creatures you control with power 4 or
greater.
{1}{g}, {t}: Double the number of +1/+1
counters on Brutal Hydra. This ability costs
{x} more to activate, where X is the number
of +1/+1 counters on Brutal Hydra.