Magic stone

Imbude three pebbles with magic. Anyone can
make a ranged spell attack with one of the
pebbles. (Throw or sling) If thrown, range of
60 feet. Spellcasting mod of me is tied to stone.
Hit, 1d6+ modifier bludgeoning damage. Then
the spell ends on the stone. If you cast this spell
again, the spell ends on any pebbles you've
previously imbuded.