Mortuary, Bolas's Citadel, Dross Harvester, and Blood Pet

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Dross Harvester on the battlefield
• Blood Pet on the battlefield

Steps

1. Activate Blood Pet by sacrificing it
2. When Blood Pet dies, Mortuary and Dross Harvester trigger
3. Resolve the Mortuary trigger, putting Blood Pet from your graveyard onto the top of your library
4. Resolve the Dross Harvester trigger, causing you to gain 2 life
5. Cast Blood Pet from the top of your library by paying 1 life
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite lifegain triggers
• Infinite storm count
• Infinite black mana
• Infinite lifegain