Toph, the First Metalbender, Haru, Hidden Talent, Firdoch Core, and Grinding Station

Prerequisites

• Toph, the First Metalbender on the battlefield
• Haru, Hidden Talent on the battlefield
• Firdoch Core in hand
• Grinding Station on the battlefield
• available

Steps

1. Cast Firdoch Core by paying
2. When Firdoch Core enters, Grinding Station and Haru trigger
3. Resolve the Grinding Station trigger, untapping it
4. Resolve the Haru trigger, earthbending Firdoch Core, as it's a land due to Toph
5. Activate Grinding Station by tapping it and sacrificing Firdoch Core
6. When Firdoch Core dies, Haru triggers, returning Firdoch Core from your graveyard to the battlefield
7. Repeat steps 2 through 4 once
8. Resolve the Grinding Station ability from step 5
9. Repeat from step 5

Results

• Infinite LTB
• Infinite death triggers
• Infinite landfall triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill