Mortuary, Bolas's Citadel, Blood Pet, and Vindictive Vampire

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Blood Pet on the battlefield
• Vindictive Vampire on the battlefield

Steps

1. Activate Blood Pet by sacrificing it
2. When Blood Pet dies, Mortuary and Vindictive Vampire trigger
3. Resolve the Mortuary trigger, putting Blood Pet from your graveyard onto the top of your library
4. Resolve the Vindictive Vampire trigger, causing you to gain 1 life and dealing 1 damage to each opponent
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 damage
• Infinite lifegain triggers
• Infinite storm count
• Infinite black mana