Riptide Hydra

{4}{g}{u}: Adapt 2 (if this creature has no +1/+1
counters on it, put two +1/+1 counters on it.)
Whenever one or more +1/+1 counters are put
on Riptide Hydra, put a +1/+1 counter on each
other creature you control.
The sea is no safer from these monstrosities than
the land.