Hello. I had a working ones by asking my Goddess to grant me this wish. I prayed at my altar. Also one was to ask mother nature. On a full grown leaf, write your wish or anything that symbolizes your wish. Then put it under a rock or leave it in a river. It may come true. Blessed be~
Just one point; it also depends on your wish. If its something typically impossible such as transition into another being, it won't work.