Tap into a spell from a spellcaster within range, twisting it enough to push it off course. If the spell has a single target, the original caster makes a Wisdom save. If they fail, they lose control of the spell. If they succeed, you fail to push the spell off course.
Once the spell is off course, you can attempt to take control of the spell by making a successful Wisdom saving throw. Failure means the spell misses the target completely. Success results in you gaining control and pointing the spell toward another target within the original spells range.
If the original spell is of a higher level than you can cast, make your wisdom save with disadvantage.