Prismatic Lens

Though this singular crystal lens appears to be one solid piece of glass, it is actually five lenses expertly folded together, and on closer inspection, each lens appears to be a different color. While wearing this lens, you are permanently under the effects of the detect magic spell. This item has 5 charges. As an action on your turn, you can expend both a spell slot of 1st level and a single charge from the lens, then choose either Bard, Cleric, Druid, Warlock, or Wizard. Then, as part of the same action, you can cast a spell of a level equal to the level of the expended spell slot with a casting time of 1 action from the chosen class spell list. You do not need to know the spell to cast it, and it does not need to be on your class spell list. You can not choose the same class more than once each long rest. The lens regains 1d6-1 charges each day at dawn. When you expend the last charge, roll a d20. As a result of 1, the arcane power flowing through the lens overwhelms it and the glass shatters, rendering the lens unusable.