Mortuary, Bolas's Citadel, Carrion Feeder, and Zulaport Cutthroat

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Carrion Feeder on the battlefield
• Zulaport Cutthroat on the battlefield

Steps

1. Activate Carrion Feeder by sacrificing itself
2. When Carrion Feeder dies, Mortuary and Zulaport Cutthroat trigger
3. Resolve the Mortuary trigger, putting Carrion Feeder on top of your library from your graveyard
4. Resolve the Zulaport Cutthroat trigger, causing you to gain 1 life and each opponent to lose 1 life
5. Resolve the Carrion Feeder ability, doing nothing
6. Cast Carrion Feeder from the top of your library by paying 1 life
7. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count