The Great Big Wall

Once upon a time there was a world where everything could change. It was based on how it is in the modern world except every year they preform a changes festival in the changes festival they pick a person who would select one way to change the world that must be impossible to do with any amount of human effort. Though it is not very easy because someone would do the opposite of it the next year. This made it super hard though because one bad person thought to make this tradition and power to go away entirely. Nobody could undo it for a long timer and their world suffered because this world was a world of hardship and relied on the yearly wish to survive. Soon though the world learned to try to make everything possible.