Carrier

Squad {6}
Flying, Vigilance
When Carrier enters the battlefield create four 1/1 white and blue Interceptor artifact creature tokens with flying and vigilance then attach them to Carrier.
At the beginning of your upkeep you may pay X. If you do create X 1/1 white and blue Interceptor artifact creature tokens with flying and vigilance then attach them to Carrier.
When Carrier attacks detach all Interceptors from Carrier. They are attacking with Carrier.
When Carrier blocks detach all Interceptors from