Micro SF/F by O. Westin: "I wish I could do magic.' "If you have no magic," said the witch, "it's because you've used it all." "I've never done magic." "There's one spell most can do instinctively - turn back time. It only works once, it's so big it burns up all your magic." "I've never! If I could, I..." "Would have?"

"I wish I could do magic.' "If you have no magic," said the witch, "it's because you've used it all." "I've never done magic." "There's one spell most can do instinctively - turn back time. It only works once, it's so big it burns up all your magic." "I've never! If I could, I..." "Would have?"