Mortuary, Bolas's Citadel, and Death Cultist

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Death Cultist on the battlefield

Steps

1. Activate Death Cultist by sacrificing it
2. When Death Cultist dies, Mortuary triggers, putting Death Cultist from your graveyard onto the top of your library
3. Resolve the Death Cultist ability, causing an opponent to lose 1 life and you to gain 1 life
4. Cast Death Cultist from the top of your library by paying 1 life
5. Repeat

Results

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