The Enigma Jewel // Locus of Enlightenment, Deserted Temple, and Karoo

Prerequisites

• The Enigma Jewel // Locus of Enlightenment on the battlefield
• Deserted Temple on the battlefield
• Karoo on the battlefield

Steps

1. Activate Karoo by tapping it, adding Activate Deserted Temple's second ability by paying and tapping it, targeting itself
2. Locus of Enlightenment triggers, copying Deserted Temple's ability, targeting Karoo
3. Resolve both Deserted Temple abilities, untapping it and Karoo
4. Repeat

Results

• Infinite untap of lands you control
• Infinite mana lands you control can produce
• Infinite colorless mana
• Infinite white mana