Mortuary, Harvester of Souls, and Walking Ballista

Prerequisites

• Mortuary on the battlefield
• Harvester of Souls on the battlefield
• Walking Ballista in hand

Steps

1. Cast Walking Ballista by paying
2. Walking Ballista 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 Walking Ballista from your graveyard onto the top of your library
4. Resolve the Harvester of Souls trigger, causing you to draw a card, thus drawing Walking Ballista from your library
5. Repeat

Results

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