Toph, the First Metalbender, Toph, Hardheaded Teacher, Bartolomé del Presidio, and Izzet Boilerworks

Prerequisites

• Toph, the First Metalbender on the battlefield
• Toph, Hardheaded Teacher on the battlefield
• Bartolomé del Presidio on the battlefield
• Izzet Boilerworks on the battlefield

Steps

1. Cast the artifact by paying
2. Toph, Hardheaded Teacher triggers, earthbending Izzet Boilerworks
3. Resolve the artifact spell
4. Activate Bartolomé del Presidio by sacrificing Izzet Boilerworks
5. When Izzet Boilerworks dies, Toph, Hardheaded Teach triggers, returning Izzet Boilerworks from your graveyard to the battlefield tapped
6. When Izzet Boilerworks 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 Bartolomé del Presidio ability Repeat

Results

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