A Question

I would like to know if it is possible to disable specific buttons from a unit's command card for a short period of time.

Here is what the spell I'm trying to create is supposed to do:

When cast, it prevents all nearby enemy casters from using their first spell; that is, the spell which appears closest to the bottom left on their command card; and after fifteen seconds wears off, allowing them to use that spell once again.

There are three levels to this spell, disabling the first, second and third spells on the enemy unit's command card respectively.

For example, if used on a human Priest, at level one Heal would be disabled; at level two, Heal and Dispel; and at level three, Heal, Dispel and Inner Fire would all be disabled.


Is it possible to do this given that there's no way to be entirely certain which spells the target unit has?