Decoction Module + Lae'zel, Vlaakith's Champion + Automated Assembly Line + Panharmonicon

Decoction Module

Lae'zel, Vlaakith's Champion

Automated Assembly Line

Panharmonicon

How it works

1. Activate Automated Assembly Line by paying EEE, creating a tapped 3/3 Robot artifact creature token.
2. When the Robot enters the battlefield, Decoction Module triggers twice, causing you to get EEEE.
3. Repeat.

This engine relies on multiplying your energy gains to turn Automated Assembly Line's token-generation loop into a net-positive enterprise. Whenever you pay three energy to create a 3/3 Robot, its entry triggers Decoction Module—an effect doubled by Panharmonicon so you get two separate triggers. Lae'zel, Vlaakith's Champion supercharges this generation by adding an extra energy counter to every batch you receive, turning what would be two energy into four. That leaves you with a surplus of energy every cycle to fund the Automated Assembly Line indefinitely, while Decoction Module's activation ability can even bounce your creatures back to hand if you ever need to pivot.