Magical Uses: Transmutation, Protection. A hoop or loop of twisted Yucca fibers will change a person into an animal if he or she jumps through it, according to Native American magic. Another method instructs the magician to place a wreath of Yucca fibers on his or her head. This allows the person to assume any form he or she wants. Suds made from the Yucca plant are used in purifying the body before magic. If a spell to remove curses or illnesses is performed, repeat the Yucca-suds bath afterward to ensure that all traces of the evil or sickness are removed.