Mortuary, Bolas's Citadel, Vein Ripper, and Carrion Feeder

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Vein Ripper on the battlefield
• Carrion Feeder on the battlefield

Steps

1. Activate Carrion Feeder by sacrificing it
2. When Carrion Feeder dies, Mortuary and Vein Ripper trigger
3. Resolve the Mortuary trigger, putting Carrion Feeder from your graveyard onto the top of your library
4. Resolve the Vein Ripper trigger, causing you to gain 2 life and target opponent to lose 2 life
5. Resolve the Carrion Feeder ability
6. Cast Carrion Feeder from the top of your library by paying 1 life
7. Repeat

Results

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