This peculiar loop hinges on animating Caged Sun with Animating Faerie // Bring to Life while Ashaya, Soul of the Wild is on the battlefield. Because Ashaya turns all of your nontoken creatures into Forest lands in addition to their other types, the newly creature-animated Caged Sun also becomes a land, meaning it can now tap directly for mana. When you tap Caged Sun for green mana, its own static mana ability triggers to add an additional green mana, which in turn triggers it *again* in an endless, un-stoppable loop of mandatory mana generation. Because this creates an infinite loop of uninterrupted mana abilities with no optional point of exit, the game cannot legally progress and immediately ends in a draw.