Shamelessly necroing this thread (hope thats ok :S) on the grounds that I just had exactly the same idea and jorb seemed to think it was reasonable, so just reminding him

MrPunchers wrote:Oppresive Attack with Attack Weight of MC*0.8 that gives 10% Cornered and Reeling, costing one IP and removing 1 IP for every 20% of Cornered Opening the opponent has (or they you have 40% Cornered than they lose 2 IP from the Attack). CD of 40/u.
I think it should be oppressive/reeling, but give 15%*mu Dizzy opening. The damage should be small and the formula could just be based on str, like UA attacks, or based on shield quality. Cooldown of 40/mu might be overpowered, and I'm not sure it should cost IP (or possibly it should be 0+N).
I really like the removal of IP based on cornered opening, this is something that mc really lacks. I'm guessing it could be like Steal Thunder, where the amount of IP it removes is dependent on how unblocked it is, with a maximum of 3 at fully unblocked (but it shouldn't steal IP). I think 1IP removal / 20% is probably overpowered.