This loop creates an endless loop of land drops by leveraging Patron of the Moon's ability to repeatedly drop lands for just one mana. When Simic Growth Chamber enters the battlefield, its triggered ability forces it right back to your hand, supplying the continuous ammo needed for Patron of the Moon while feeding Nissa, Resurgent Animist's landfall triggers. Every time that bounce and landfall cycle completes, Nissa, Resurgent Animist rewards your efforts by generating mana of any color, fueling the whole engine indefinitely.