Edeneth's Mirror Shield

A faint barrier with a mirrored sheen is interposed between you and a spell which targets you. For the duration, your AC and Saving Throws against spells increase by +5. When a spell attack misses or you succeed on a saving throw against a spell that targets only you, the spell's effects are negated and instead target the original caster using the original caster's spell attack modifier, ability, and save DC (roll spell attacks with those parameters as if you are casting the spell).

Missiles from the magic missile spell targeting you automatically target the original caster.

Spells reflected back at the original caster cannot be reflected again, but the AC and Saving Throw buffs still apply.  This spell reflects spells of 3rd level or lower.