Automated Assembly Line

Whenever one or more artifact creatures you control deal combat damage to a player, you get {E} (an energy counter). Pay {E}{E}{E}: Create a tapped 3/3 colorless Robot artifact creature token.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o7x4i4xt1pb1hqpcbokk2.