A "transfiguration obstacle course." Contestants bring a palm-sized inanimate object of their choosing, and must then transfigure it into a vessel designed to carry them through various obstacles (think flying, underwater, being chased by small but dangerous magical creatures, etc). Could be done as a last-man-standing or as a race depending on how dangerous the events are. Both the constant and their transfigured object should survive the course in order to win.