Leonardo, Sewer Samurai, Solemnity, Phantom Train, and Ornithopter

Prerequisites

• Leonardo, Sewer Samurai on the battlefield
• Solemnity on the battlefield
• Phantom Train on the battlefield
• Ornithopter on the battlefield

Steps

1. Activate Phantom Train by sacrificing Ornithopter
2. Cast Ornithopter from your graveyard by paying
3. It will not enter with a finality counter on it due to Solemnity
4. Repeat

Results

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