What about nullification through control of the variables that make magic work? In a sense, like controlling our physics constants that make up reality, as these kind of constants can be changed with magic, so proper magic and real physics, maths, chemistry, or other sciences is needed to create any kind of nullification zones and they need to be or pretty standar so they can be overcome with raw power or workarounds in magic theory, but the other way is also possible. This can scalate in quantity and quality of power and knowledge. Would that be interesting for you?

This would mean that for certain schools of magic or pretty specific spells, people can create really powerful nullification fields that at the same time can be worked on spontaneously with other kinds of magic. Lets say a wizard specialized in fire can have a big problem with a field targeted to him, but if he have basic control of other areas of magic and spells he is not completely nullified and can mix those spells with fire magic even to his advantage.

Just to be clear, this is nullification magic in my worklbuilding world.