Question: what if magic damage abilities damaged towers?

What I'm envisioning here is this:

%damage reduction based on range it was cast from %damage reduction based on AOE No %HP effects Cannot use targeted gapclosers

So something like Lux's laser or Ziggs Bomb would do almost nothing, but it would allow you to tower siege with say a Casseopia or Veigar.

Do you believe that this would break the game or make it more interesting? I think it'd be cool to see if ADC-less comps arose in response using an AP ranged carry, but because of the range reduction, super safe pushers like Lux or Ziggs power would be greatly reduced, but you could have AP carries like Viktor, Veigar or Casseopia to take the role traditionally reserved for the AD carry master race.

Thoughts?