Mortuary, Ashes of the Abhorrent, Bolas's Citadel, and Spore Frog

Prerequisites

• Mortuary on the battlefield
• Ashes of the Abhorrent 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 Ashes of the Abhorrent trigger
3. Resolve the Mortuary trigger, putting Spore Frog from your graveyard onto the top of your library
4. Resolve the Ashes of the Abhorrent trigger, 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 death triggers
• Infinite lifegain triggers
• Infinite sacrifice triggers
• Infinite storm count