Mortuary, Bolas's Citadel, Bontu's Monument, and Phantom Train

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Bontu's Monument on the battlefield
• Phantom Train on the battlefield

Steps

1. Activate Phantom Train by sacrificing a creature with mana value 1 or less
2. When the creature dies, Mortuary triggers, putting the creature from your graveyard onto the top of your library
3. Resolve the Phantom Train ability
4. Cast the creature from the top of your library by paying 1 life
5. Bontu's Monument triggers, causing you to gain 1 life and each opponent to lose 1 life
6. Repeat

Results

• Infinite creature LTB
• Infinite creature ETB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite lifegain triggers
• Infinite storm count
• Infinite lifeloss
• Infinite +1/+1 counters on a creature