Leonardo, Sewer Samurai, Tatterkite, Grinding Station, and Animar, Soul of Elements

Prerequisites

• Leonardo, Sewer Samurai on the battlefield
• Tatterkite in the graveyard
• Grinding Station on the battlefield
• Animar, Soul of Elements on the battlefield

Steps

1. Cast Tatterkite from your graveyard by paying due to Animar
2. It won't enter with a finality counter on it due to its static ability
3. Animar triggers, putting a +1/+1 counter on it
4. When Tatterkite enters, Grinding Station triggers, untapping Grinding Station
5. Activate Grinding Station by tapping it and sacrificing Tatterkite
6. Repeat

Results

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