Blossoming Tortoise, Deserted Temple, Rings of Brighthearth, and Tectonic Split

Prerequisites

• Blossoming Tortoise on the battlefield
• Deserted Temple on the battlefield
• Rings of Brighthearth on the battlefield
• Tectonic Split on the battlefield

Steps

1. Activate a land by tapping it, adding three mana of any color due to the ability given to it by Tectonic Split
2. Activate Deserted Temple's second ability by tapping it, targeting the land Rings of Brighthearth triggers, causing you to pay to copy Deserted Temple's ability, targeting Deserted Temple
3. Resolve both Deserted Temple abilities, untapping Deserted Temple and the other land Repeat

Results

• Infinite colored mana
• Infinite mana lands you control can produce
• Infinite untap of lands you control