Mortuary, Vindictive Vampire, Bolas's Citadel, and Spore Frog

Prerequisites

• Mortuary on the battlefield
• Vindictive Vampire on the battlefield
• Bolas's Citadel on the battlefield
• Spore Frog on the battlefield

Steps

1. Activate Spore Frog by sacrificing it
2. When Spore Frog dies, Mortuary and Vindictive Vampire trigger
3. Resolve the Mortuary trigger, putting Spore Frog from your graveyard onto the top of your library
4. Resolve the Vindictive Vampire trigger, dealing 1 damage to each opponent and causing you to gain 1 life Resolve the Spore Frog ability
5. Cast Spore Frog from the top of your library by paying 1 life
6. Repeat

Results

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