So I watched most of your video (I think I got the point fairly quickly), There is no AP like Rabbadon. However, as a second major AP item on a champ that can play from such a safe distance (meaning could play without a zhonya's in the right comp), that is strong AP, plus the proc. Now it is little easier to say I can play without a zhonya's cause I am in bronze (even though I solo Q'ed my way to silver only to be put back in bronze 5 by placements).
Don't get me wrong, I don't think it is way and above out of hand, but maybe something to look at balance wise for champs that already clear so well as it gives them faster clear earlier in the game.