Group B

Pilots and Vehicles you control are Allies in
addition to their other types.
Rally — Whenever Group B or another Ally
enters the battlefield under your control, put two
+1/+1 counters and a velocity counter on target vehicle you control. If that vehicle has three or
more velocity counters on it, sacrifice it and each creature that crewed it this turn. Then, if you've sacrificed three or more Vehicles this way,
sacrifice Group B.