We need to add Ability Power Crit Chance Items to the Game.

As all of you know, most AD champions build Crit chance that enhances the damage done by attack damage. However, we do not have items that add a crit chance to ability power increasing the damage of ability power abilities (as far as I know). I am aware that some champions like LeBlanc and Karthus have a passive that adds a sort of "on hit ap crit". I feel as if the absence of ap crit items lowers the versatility we could potentially have seen in the game with the addition of such items. Not only would the addition of these make even more fun,crazy, and practical builds for champions, but also add a whole new level of gameplay overall.