Backfire

Choose a creature you can see within range. The next time it casts a spell, it must make a Wisdom saving throw. On a failure, it takes Psychic damage equal to 1d6 times the spells level, and the spell fails (the spell slot is still
consumed), and the spell ends. On a success, it takes only half as much damage and the spell does not fail. A creature is unaware it has been affected by magic, both before and after attempting to cast a spell, unless it either
succeeds on an Intelligence (Arcana) check vs your spell save DC, or has some way of sensing
magic, such as the detect magic spell.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the interrupted spell has no effect if its level is less than or equal to the level of the spell slot you used.