Vampiric Arrow

The caster creates an ethereal, red arrow, seeping with what appears to be blood which sails through the air, a red glow trailing behind it. Make a ranged spell attack against one creature you can see within 60 feet of you. On a hit, it deals 3d6 necrotic damage as well as heal yourself equal to the damage dealt. On a miss, the arrow deals 1d4 necrotic damage and heals you for the same amount of damage dealt. 

At higher levels:  When you cast this spell using a spell slot of 3rd level or higher, the on-hit damage increases by 1d6 for each slot level above 2nd.