Toph, the First Metalbender, Toph, Hardheaded Teacher, Umbral Collar Zealot, and Guildless Commons

Prerequisites

• Toph, the First Metalbender on the battlefield
• Toph, Hardheaded Teacher on the battlefield
• Umbral Collar Zealot on the battlefield
• Guildless Commons on the battlefield

Steps

1. Cast the artifact by paying
2. Toph, Hardheaded Teacher triggers, earthbending Guildless Commons
3. Resolve the artifact spell
4. Activate Umbral Collar Zealot by sacrificing Guildless Commons
5. When Guildless Commons dies, Toph, Hardheaded Teach triggers, returning Guildless Commons from your graveyard to the battlefield tapped
6. When Guildless Commons 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 Umbral Collar Zealot ability Repeat

Results

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