Automated Assembly Line + Gonti's Aether Heart + Demon of Dark Schemes + Yahenni, Undying Partisan

Automated Assembly Line

Gonti's Aether Heart

Demon of Dark Schemes

Yahenni, Undying Partisan

How it works

1. Activate Automated Assembly Line by paying EEE, creating a 3/3 Robot artifact creature token.
2. When the Robot enters the battlefield, Gonti's Aether Heart triggers, causing you to get EE.
3. Activate Yahenni by sacrificing the Robot.
4. When the Robot dies, Demon of Dark Schemes' second ability triggers, causing you to get E.
5. Resolve the Yahenni ability, giving it indestructible until end of turn.
6. Repeat.

This engine transforms an infinite loop of creation and sacrifice into a self-sustaining energy factory, entirely fueled by Gonti's Aether Heart, which rewards every artifact entry with two energy counters. Automated Assembly Line then spends that energy to forge a 3/3 Robot artifact creature token, which immediately feeds that entry trigger back into Gonti's Aether Heart. When Yahenni, Undying Partisan sacrifices the Robot, Demon of Dark Schemes swoops in to grant an extra energy counter upon its death while readying its own reanimation magic if needed. The beauty of this loop lies in how seamlessly the energy flows between building and sacrificing the Robot, creating an endless cascade of triggers right under the watchful eye of Yahenni, Undying Partisan and Demon of Dark Schemes.