Nashor, Mutating Hydra

Nashor, Mutating Hydra enters the battlefield
with X +1/+1 counters
Whenever a +1/+1 counter is put onto another creature that you control, put that many +1/+1
counters on Nashor, Mutating Hydra as well.
Instilling a hydra with the need to have the most heads
in the area leads to explosive results