Hydra Hatchling

At the beginning of your upkeep, put a +1/+1 counter on Hydra Hatchling.
If Hydra Hatchling has 4 or more +1/+1 counters on it, it has Trample.
If Hydra Hatchling has 9 or more +1/+1 counters on it at any time, transform it.