Chronomancer's Clockwork

You've studied the power of chronomancy and you're ready to unleash it upon the world. You always have the spells Haste, Slow, and Time Stop prepared. You may cast each spell once per long rest without using a spell slot. When doing so, each creature of your choice within 30 ft takes 2d8 psychic damage. When all three spells have been used, your clock shatters and you take 8d6 psychic damage. You cannot use the spells again until a long rest.