Mortuary, Phantom Train, Crimson Kobolds, and Bolas's Citadel

Prerequisites

• Mortuary on the battlefield
• Phantom Train on the battlefield
• Crimson Kobolds on the battlefield
• Bolas's Citadel on the battlefield

Steps

1. Activate Phantom Train by sacrificing Crimson Kobolds When Crimson Kobolds dies, Mortuary triggers, putting Crimson Kobolds from your graveyard onto the top of your library
2. Resolve the Phantom Train ability
3. Cast Crimson Kobolds from the top of your library by paying 0 life
4. Repeat

Results

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