Mortuary, Bolas's Citadel, Ashnod's Altar, and Willow Geist

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Ashnod's Altar on the battlefield
• Willow Geist in hand

Steps

1. Activate Ashnod's Altar by sacrificing Willow Geist
2. When Willow Geist dies, it and Mortuary triggers
3. Resolve the Mortuary trigger, putting Willow Geist from your graveyard onto the top of your library
4. Resolve the Willow Geist trigger, causing you to gain 1 life
5. Cast Willow Geist from the top of your library by paying 1 life due to Bolas's Citadel
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite storm count