Leonardo, Sewer Samurai, Solemnity, Grinding Station, and Phyrexian Walker

Prerequisites

• Leonardo, Sewer Samurai on the battlefield
• Solemnity on the battlefield
• Grinding Station on the battlefield
• Phyrexian Walker on the battlefield

Steps

1. Activate Grinding Station by tapping it and sacrificing Phyrexian Walker
2. Cast Phyrexian Walker from your graveyard by paying
3. It will not enter with a finality counter on it due to Solemnity
4. When Phyrexian Walker enters, Grinding Station triggers, untapping Grinding Station
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill
• Infinite storm count