Celes, Rune Knight, and Phantom Train

Prerequisites

• Celes, Rune Knight on the battlefield
• Phantom Train on the battlefield

Steps

1. Activate Phantom Train by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When the persist creature enters the battlefield, Celes's second ability triggers, putting a +1/+1 counter on each creature you control
4. Resolve the Phantom Train ability
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters