well thats rly legendary....u can even use it in a dungeon -.-
there also is a caster legendary, same as that bow only usable in a dungeon.
Casters have one alrdy, atiesh(warlock, mage, priest versions). Paladins have one alrdy, hand of ragnaros. Warriors&rogues have one alrdy, azzinoth blades. And finally hunter will get one.