Try adding a new buff called Dalaran Brilliance to Grid.
Never actually tried that myself, so it might take some tinkering. But I've added new debuffs like Frost Blast, so I imagine buffs work the same way.
On topic, no I keep spending gold on alts. I do like the look of the buff though, I've thought about buying it before. It's just not a priority right now. The last big thing I bought on my mage was polymorph turtle for 2k gold at 70.