CG doesn't seem to want to rework greivous. It's time to do it for them. (Note, this is not hate, its is just helping people get what they want. Love you CG) This is my idea of a grievous rework, and ...
I think evading is foresight and evasion, but missing would be using the accuracy of Grievous. The other characters evasion stats wouldn't matter. The daze and defense down would last for 2 turns. I put the cooldown so high because I envisioned this doing huge damage, thus justifying the long cooldown and self-damage. Thanks so much for your feedback :)