Mortuary, Bolas's Citadel, Cauldron Familiar, and Ashnod's Altar

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Cauldron Familiar in hand or in the library
• Ashnod's Altar on the battlefield
• if Cauldron Familiar is in your hand available

Steps

1. Cast Cauldron Familiar either from your hand or from the top of your library by paying or 1 life respectively
2. When Cauldron Familiar enters, it triggers, causing each opponent to lose 1 life and you to gain 1 life
3. Activate Ashnod's Altar by sacrificing Cauldron Familiar
4. When Cauldron Familiar dies, Mortuary triggers, putting Cauldron Familiar from your graveyard onto the top of your library
5. Repeat

Results

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