Arcane Mimicry

When an enemy tries to make an attack with a spell within 60 feet, you can make them stop casting the spell and instead, cast it yourself.  Your target must succeed on a constitution saving throw against your spell save DC or stop casting their spell.  You must cast that spell immediately, taking a spell slot to do so.  If you do not have the spell slot to cast it, the spell does not cast and you take 1d4 + the spell's level psychic damage.