Toph, the First Metalbender, Argothian Elder, and Encroaching Mycosynth

Prerequisites

• Toph, the First Metalbender in hand or on the battlefield or in the command zone
• Argothian Elder on the battlefield
• Encroaching Mycosynth on the battlefield

Steps

1. Activate Argothian Elder by tapping it, untapping it as it's a land due to Toph and another land you control
2. Repeat

Results

• Infinite mana lands you control can produce
• Infinite untap of lands you control
• Infinite untap of nontoken artifacts you control
• Infinite mana nontoken artifacts you control can produce