Dancing Daggers

You create a magical dagger that levitates and orbits around you for the spell's duration. You can use a bonus action during that time to make a ranged spell attack with the dagger against a target within 60 feet of you. On a hit, the target takes magical piercing damage equal to 1d4 + your spellcasting ability modifier. Each dagger lasts until you make an attack with it, until you cast this spell again, or until you fall unconscious. 

You can conjure two daggers at 5th level, three at 11th level, and four at 17th level.