Swordsman's Curse

An artificer once asked himself if he could make his blade bite his enemies. And he taught it to do so. 

Once cast, the sword becomes imbued with a vampiric curse, dealing an extra 1d4 necrotic damage to enemies on a successful hit, as well as healing yourself the same amount of damage this spell dealt. Additionally, upon getting hit, a creature must make an Intelligence saving throw, or else they will be unable to avoid the curse's side effect: They will be unable to heal or use their reaction until the beginning of your next turn.

Upon upcasting, this spell deals an extra d4 of damage and heals you for that extra amount.