New Champion/ Item Concept

Ok so a couple weeks back I'd been Sandra balls deep in a 3v5 : I'd been playing Fizz, assisted by a Tristana and Evelynn. In the midst of the Spamming of spells, and Silver Sashes poppin off I was stricken with the Idea of a Champion or Item that would be able to cast an Instantaneous, in the sense of a Cass-(Q or W) Area of effect that would Negate the result of any Activations within it's bounds. This would mean that were any spell or Item to be casted within this Area, it would be wasted and go onto cooldown. I feel this would be a very beneficial both-(Obstacle and Tool) in how team fights are determined. Also were this to be a designated spell for a NEWER-Champion I'd think it should be either a Tanky tickle monster or AP Caster with mild scaling. Thanks for reading ^-^