Automated Assembly Line, Gonti's Aether Heart, Demon of Dark Schemes, and Phantom Train

Prerequisites

• Automated Assembly Line on the battlefield
• Gonti's Aether Heart on the battlefield
• Demon of Dark Schemes on the battlefield
• Phantom Train on the battlefield

Steps

1. Activate Automated Assembly Line by paying , creating a 3/3 Robot artifact creature token
2. When the Robot enters the battlefield, Gonti's Aether Heart triggers, causing you to get
3. Activate Phantom Train by sacrificing the Robot
4. When the Robot dies, Demon of Dark Schemes' second ability triggers, causing you to get
5. Resolve the Phantom Train ability Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on a creature