HMS Ichthyosauria

The HMS Ichthyosauria's power and toughness are equil to the amount of scouts boarded.
{1}: Target Scout boards the HMS Ichthyosauria.
(Place the cards of crew members in a stack next to
the graveyard.)
Kicker {5}: HMS Ichthyosauria gains indestructible.
Upon the destruction of HMS Ichthyosauria you may pay {4}, and return the crew to the battlefield tapped.