This brilliant engine turns a simple loop of energy into an unstoppable mechanical army. Automated Assembly Line acts as your primary engine, allowing you to spend accumulated energy to forge your initial Robot artifact creature tokens, which are immediately doubled into a pair of threats thanks to Parallel Lives. As those tokens enter the battlefield, Gonti's Aether Heart recognizes the influx of artifacts and triggers twice for each, generating more than enough energy to pay for the Assembly Line's activation cost again. By cycling this energy back into the Automated Assembly Line, you fuel an infinite sequence of creature enters-the-battlefield triggers, an infinite horde of 3/3 tokens, and an endless surplus of energy.