A-Core Harvester

Swampwalk, Forestwalk, A-Corelink (Damage
dealt by this creature also causes you to create that
many 1/1 A-Core creature tokens.)
If one or more tokens would be created under
your control, those tokens plus that many
1/1 A-Core creature tokens are created instead.
Crew 4 (Tap any number of creatures you control
with total power 4 or more: This Vehicle becomes an artifact creature until end of turn.)