Praos, The Peacemaker

Reach
Hydras you control have Defender.
{x}{g/w}{g/u}: Regenerate target Hydra, then put X
+1/+1 counters on it.
At the beginning of each end step, you may have target player gain control of another Hydra you
own. If a Hydra you own died or attacked you
this turn, transform Praos, The Peacemaker.