Toph, the First Metalbender, Toph, Hardheaded Teacher, Dimir Aqueduct, and Coastal Hornclaw

Prerequisites

• Toph, the First Metalbender on the battlefield
• Toph, Hardheaded Teacher on the battlefield
• Dimir Aqueduct on the battlefield
• Coastal Hornclaw on the battlefield

Steps

1. Cast the artifact by paying
2. Toph, Hardheaded Teacher triggers, earthbending Dimir Aqueduct
3. Resolve the artifact spell
4. Activate Coastal Hornclaw by sacrificing Dimir Aqueduct
5. When Dimir Aqueduct dies, Toph, Hardheaded Teach triggers, returning Dimir Aqueduct from your graveyard to the battlefield tapped
6. When Dimir Aqueduct enters, it triggers, returning the artifact cast in step 1 from the battlefield to your hand, as it's a land due to Toph, the First Metalbender
7. Resolve the Coastal Hornclaw ability Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite landfall triggers
• Infinite creature sacrifice triggers
• Infinite storm count