This trick revolves around one item : Black Blood of Y'Shaarj. It's a caster trinket that drops on Garrosh. I only tested with the Normal, non-warforged version, but I assume it works with every version of it.
via N4G: pc news feed http://n4g.com/news/1405331/18-28k-permanent-intellect-buff-as-a-mage-in-world-of-warcraft
via N4G: pc news feed http://n4g.com/news/1405331/18-28k-permanent-intellect-buff-as-a-mage-in-world-of-warcraft