Olohkun, Steel-Born Leviathan

Trample
Humans you control can crew this vehicle as
thought their power were 2 greater.
Humans crewing this vehicle have protection
from non-blue cards.
Whenever another Leviathan, Fish or Serpent creature card enters
the battlefield under your control,
untap X permanents you control,
where X is that creatures power.
Crew 4