Large Robot Factory

Charge 4 (Pay {e}{e}{e}{e}: this factory is producing this of turn.)
At the end of your turn, if Large Robot Factory is producing, create a 3/3 colorless Servo artifact creature token.
At the beginning of your upkeep, if you control a Small Robot Factory and a Medium Robot Factory, you may pay {e}{e}. If you do, create a
5/5 colorless Servo artifact creature token.