Mortuary, Umbral Collar Zealot, Phyrexian Walker, and Bolas's Citadel

Prerequisites

• Mortuary on the battlefield
• Umbral Collar Zealot on the battlefield
• Phyrexian Walker on the battlefield
• Bolas's Citadel on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Phyrexian Walker When Phyrexian Walker dies, Mortuary triggers, putting Phyrexian Walker from your graveyard onto the top of your library
2. Resolve the Umbral Collar Zealot ability
3. Cast Phyrexian Walker from the top of your library by paying 0 life
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite storm count
• Infinite surveil 1