Mortuary, Bolas's Citadel, Umbral Collar Zealot, and Market Gnome

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Umbral Collar Zealot on the battlefield
• Market Gnome in hand

Steps

1. Activate Umbral Collar Zealot by sacrificing Market Gnome
2. When Market Gnome dies, it and Mortuary triggers
3. Resolve the Mortuary trigger, putting Market Gnome from your graveyard onto the top of your library
4. Resolve the Market Gnome trigger, causing you to gain 1 life and draw a card
5. Resolve the Umbral Collar Zealot ability
6. Cast Market Gnome from the top of your library by paying 1 life due to Bolas's Citadel
7. Repeat

Results

• Infinite card draw
• Near-infinite ETB
• Infinite draw triggers
• Near-infinite storm count
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite sacrifice triggers
• Near-infinite surveil 1