Skorkle, the Ozolith's Growls

Whenever a counter is put on another creature put a +1/+1 counter on Skorkle.
{t} {g/u}{g/u}{g/u}: create X 1/1 Green and Blue
Beast Creature tokens with "when this creature enters the battlefield, mutate it
with target creature" where X is the number
of counters on Skorkle.