well first off i have to say i love the whole look of him, the way you used skrall armor for the mask and slizer parts for his feet is really nice. and i love the staff too :O. the way you have him posed he looks kinda like Voldo from Soul calibur.
Posture is amazing, staff design is clever, and originality is good, too. You don't see too many magic MOCs in this category. A formiddable use of the Mask of Wisdom, too. While not a canon mask, it's been coined as a design by MacLane Mars - and it seems like a good one to me. :)