Possibly. There was this legendary quest drop from C'Thun called "Essence of Madness" right?
- Casters only.
Now you've linked this pic, and Sinarion
dug up another legendary staff way way back when Ahn'Qiraj was still being designed.
Seems like a good one. Two completely different legendary staffs and the choice is yours once you get the essence off C'Thun.
Harmony of Elune
68.8 dps (159-254)
+21 Stamina
+47 Intellect
+34 Spirit
Use: Restores 60 mana every 2 sec for 45 sec.
Equip: Increases damage and healing done by magical spells and effects by up to 127.
Equip: Restores 1% of your total mana every 5 sec.
Though, as discussed in Sinarion's thread, with 8000 max mana that Elune staff would be equivalent to 80 mana per 5 seconds, passive.
That Elune thing also has better passive damage then that Andarian staff thingy.
All of it is, well, pretty damned (over?) powerful.