Dr. Madison Li + Intruder Alarm + Robobrain War Mind + Yahenni, Undying Partisan

Dr. Madison Li

Intruder Alarm

Robobrain War Mind

Yahenni, Undying Partisan

How it works

1. Cast Robobrain War Mind by paying 3.
2. When Robobrain War Mind enters, it and Intruder Alarm trigger.
3. Resolve the Robobrain War Mind trigger, causing you to get E for each artifact creature you control.
4. Resolve the Intruder Alarm trigger, untapping all creatures.
5. Activate Yahenni by sacrificing Robobrain War Mind.
6. Activate Dr. Madison Li by tapping it and paying EEEEE, returning Robobrain War Mind from your graveyard to the battlefield.
7. Repeat from step 2.

This clever loop turns the battlefield into a perpetual motion machine by leveraging the untap trigger of Intruder Alarm every time an artifact creature enters. When you use Dr. Madison Li's heavy energy-paying ability to loop Robobrain War Mind straight out of your graveyard, Robobrain War Mind's own entrance triggers to replenish your energy supply while Intruder Alarm simultaneously untaps Dr. Madison Li and Yahenni, Undying Partisan. Meanwhile, Yahenni provides the necessary sacrifice outlet to send Robobrain War Mind back to the graveyard to be recast or reanimated, completely bypassing the need to pay its mana cost over and over.