Engineer Chief

{2}{u} You may attach or unattach this creature to
an untapped mechanism you control. When being
unattached, return Sailors to their owners hands.
When mechanism is destroyed, and mana paid on
Mechanism, Sailors return to battlefield tapped.
Sailors power and toughness are added to
Mechanism. No equipment may be attached to
Sailors.
{t} Remove all battlefield damage to attached
Mechanism.