Wand of Magic Missiles

This wand has 7 charges. Use an action to expend 1+ of its charges to cast the magic missile spell. For 1 charge, you cast the spell at 1st-level. You can increase the spell slot level by one for each extra charge.
Regains 1d6 + 1 charges at dawn.
If you use the last charge, roll a d20.
On a 1, the wand crumbles into ashes.