Primordial Hydra

Primordial Hydra enters the battlefield with
X +1/+1 counters on it.
At the beginning of your upkeep, double the
amount of +1/+1 counters on Primordial Hydra.
Primordial Hydra has trample as long as it has
ten or more +1/+1 counters on it.
"The Primordial Hydra has existed since time began.
It grows with the universe." ~ Nissa Revane