Propeller Helm

From Waterdeep: Dungeon of the Mad Mage, page 284.

Description
Wondrous item, uncommon (requires attunement by a small humanoid).

While worn, the helm allows its wearer to use an action to cast the Levitate spell, requiring no components. The helm's propeller spins and whirs loudly until the spell ends. Each time the spell ends, there is a 50 percent chance that the helm loses its magic and becomes nonmagical.