Mortuary, Harvester of Souls, and Marketback Walker

Prerequisites

• Mortuary on the battlefield
• Harvester of Souls on the battlefield
• Marketback Walker in hand

Steps

1. Cast Marketback Walker by paying
2. Marketback Walker enters and dies as a state-based action due to having 0 toughness, triggering Mortuary and Harvester of Souls
3. Resolve the Mortuary trigger, putting Marketback Walker from your graveyard onto the top of your library
4. Resolve the Harvester of Souls trigger, causing you to draw a card, thus drawing Marketback Walker from your library
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers
• Infinite storm count
• Infinite draw triggers