Separatist Troop Carrier

Crew 2 (Tap any number of other untapped creatures you control with total power 2 or
greater: This permanent becomes an artifact
creature until end of turn.)
Whenever Separatist Troop Carrier becomes
crewed, Amass Droids 2. (To amass Droids 2,
put two +1/+1 counters on an Army you control.
It's also a Droid. If you don't control an Army,
create a 0/0 blue and red Droid Army artifact creature token first.)