Soulalloy Carapace

Equip {b}
Equiped creatures get +1/+1
This vehicle may only be crewed by one creature.
When an equiped or crewing creature dies, put a
+1/+1 counter on Soulalloy Carapace and reduce
its crew cost by {1} to a minimum of {1}.
Crew 4 (Tap any number of creatures with total
power 4 or more. This vehicle becomes a creature untill the end of the turn.)