The spell I have in mind is extremely similar to 'diffindo' in Harry Potter. The user gestures across a path a short distance away, and as if by an invisible knife, a minor linear cut is made across the path.
The material of the object could be a multitude of things, such as fabric, or chalk, or flesh, but in all cases it is a small cut.
What components would be in this spell? And how difficult would it be to cast?
I'm unsure whether it would be considered Perdo or Muto, as well as how to classify the broad range of materials that the spell would be able to cut.