Mortuary, Grinding Station, Phyrexian Walker, and Bolas's Citadel

Prerequisites

• Mortuary on the battlefield
• Grinding Station on the battlefield
• Phyrexian Walker on the battlefield
• Bolas's Citadel on the battlefield

Steps

1. Activate Grinding Station by tapping it and sacrificing Phyrexian Walker When Phyrexian Walker dies, Mortuary triggers, putting Phyrexian Walker from your graveyard onto the top of your library
2. Resolve the Grinding Station ability
3. Cast Phyrexian Walker from the top of your library by paying 0 life
4. When Phyrexian Walker enters, Grinding Station triggers, untapping Grinding Station
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill
• Infinite storm count