The concept of spells on the stack having protection is neat; it'd be interesting to see spells with 'Protection from Blue' instead of 'Cannot be countered'.

This is neat! I'm not sure if it's too overpowered to be hypothetically printed, but it does seem very good. Basically every White deck that could run this would want to, I'd imagine.

I like this a lot. The more I think about it, the more interesting interactions it has.