Cirle of daggers

You enchant 2 daggers, they turn around you in circle.
Each daggers give you a bonus of 1 AC, but each time you are hit one dagger fall down and loose his enchantment.
You could as a bonus action  make one hit with each of the dagger you have enchanted but they also loose their enchantment if you do so.

The hit are made in the same way as when you make a melee attack counting as a finesse weapon you are proficient but the range is 10ft.
The damage is 1d4+1 +your dexterity or strenght modifier + your proficiency bonus.

If you use a spell slot of 7lv you could enchant 3 daggers.