Saheeli, the Gifted (Commander 2018)

[+1]: Create a 1/1 colorless Servo artifact creature token. [+1]: The next spell you cast this turn costs 1 less to cast for each artifact you control as you cast it. [-7]: For each artifact you control, create a token that's a copy of it. Those tokens gain haste. Exile those tokens at the beginning of the next end step. Saheeli, the Gifted can be your commander.