Wand of Polymorph

While holding this wand, you can use an action to expend 1 charge to cast _polymorph_ (save DC 15). This wand has 7 charges and regains 1d6+1 expended charges each dawn. When the last charge is expended, roll a d20\. On a 1, the wand transforms into a Tiny bug that wanders away.

Source: Level Up Advanced 5e · OGL-1.0a · 5.1