As MTG Aetherdrift gets closer ... Pia Nalaar grants 2 energy when your artifact creatures deal combat damage. You can then pay 1 or more energy during your end step to make an X/X colorless ...

The daughter of Elder Owen Lyons, Sentinel Sarah Lyons still cares about artifacts but is more combat-oriented. She'll give all of your creatures +2/+2 each turn that an artifact comes into play ...