Mortuary, Bolas's Citadel, Skirk Prospector, and Vindictive Vampire

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Skirk Prospector on the battlefield
• Vindictive Vampire on the battlefield

Steps

1. Activate Skirk Prospector by sacrificing it
2. When Skirk Prospector dies, Mortuary and Vindictive Vampire trigger
3. Resolve the Mortuary trigger, putting Skirk Prospector 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 Skirk Prospector 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 red mana