Athene's Unholy Grail- New League of Legends item

A new item has been seen on the patch notes for PBE (public beta environment). It is called Athene's Unholy Grail (Probably named after the famous gamer Athene :P). It is a item for ap champions. It stats are found here http://leaguecraft.com/news/item-changes-in-the-upcoming-patch-varus-185.xhtml. Scroll down a bit and you will see it. As you can see it is built from a chalice of harmony so you will have tons of mana regen. It also has some ap and some mr and a pretty sick passive. It restores 12% of your mana when getting a kill or assist. Now imagine that in a team fight.... lol, as long as you stay alive in that fight and get a couple of assist/kills you will not be out of mana. The problem that I see for this item is it is only good for champions that really need the mana regen. Champions like swain or galio. Other than that it a okay item. To me it looks like a blue buff (with some extra stats) on in item. So if you need the mana regen this would be a great item other than that it is alright.