Arcane siphon

Using your knowledge and mastery of arcane energies, you try to disrupt the casting of a spell and capture some of the magical energies for your own gain. 

If the spell is 1st level or lower, it fails and has no effect but the spell slot is still consumed. You then regain a spell slot of the same level as the countered spell. If you have no used spell slot of that level, you instead suffer a power surge and take 1d4 psychic damage.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the interrupted spell has no effect if its level is less than or equal to half the level of the spell slot you used rounded down.