Toph, the First Metalbender, Toph, Hardheaded Teacher, Selesnya Sanctuary, and Coastal Hornclaw

Prerequisites

• Toph, the First Metalbender on the battlefield
• Toph, Hardheaded Teacher on the battlefield
• Selesnya Sanctuary on the battlefield
• Coastal Hornclaw on the battlefield

Steps

1. Cast the artifact by paying
2. Toph, Hardheaded Teacher triggers, earthbending Selesnya Sanctuary
3. Resolve the artifact spell
4. Activate Coastal Hornclaw by sacrificing Selesnya Sanctuary
5. When Selesnya Sanctuary dies, Toph, Hardheaded Teach triggers, returning Selesnya Sanctuary from your graveyard to the battlefield tapped
6. When Selesnya Sanctuary 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