Dark Sea Hydra

Trample, Reach
Dark Sea Hydra enters the battlefield with X +1/+1 counters on it.
When Dark Sea Hydra enters the battlefield
Double the number of +1/+1 counters on
Dark Sea Hydra.
If a creature would deal combat damage to
Dark Sea Hydra, prevent that damage
and put a +1/+1 counter on Dark Sea Hydra.