Blossoming Tortoise, Deserted Temple, Rings of Brighthearth, and Nykthos, Shrine to Nyx

Prerequisites

• Blossoming Tortoise on the battlefield
• Deserted Temple on the battlefield
• Rings of Brighthearth on the battlefield
• Nykthos, Shrine to Nyx on the battlefield
• You have at least four devotion to any color
• available

Steps

1. Activate Nykthos by paying and tapping it, adding at least four mana of any color you have devotion to
2. Activate Deserted Temple's second ability by paying due to Blossoming Tortoise and tapping it, targeting itself
3. Rings of Brighthearth triggers, causing you to pay to copy Deserted Temple's ability, targeting Nykthos
4. Resolve both Deserted Temple abilities, untapping it and Nykthos
5. Repeat

Results

• Infinite colorless mana
• Infinite mana among colors with which you have devotion
• Infinite untap of lands you control
• Infinite mana lands you control can produce