Mortuary, Phantom Train, Shield Sphere, and Bolas's Citadel

Prerequisites

• Mortuary on the battlefield
• Phantom Train on the battlefield
• Shield Sphere on the battlefield
• Bolas's Citadel on the battlefield

Steps

1. Activate Phantom Train by sacrificing Shield Sphere When Shield Sphere dies, Mortuary triggers, putting Shield Sphere from your graveyard onto the top of your library
2. Resolve the Phantom Train ability
3. Cast Shield Sphere 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