Happy gaming! The long-awaited 5.4.8 Mists of Pandaria Repack V6.0 is now live — and with it, a brand-new Emucoach App.
See what’s new and download it now
About Mages, I'm sadly not agree with you. Indeed, with Cataclysm many spells have changed including Arcane Missiles, "Each your offensive skill has 40% chance to activate Arcane Missile" http://www.wowhead.com/spell=5143/arcane-missiles#changelog (Changelog 4.3.0, because the next is 5.0.1)
That means you have to attack your target with offensive skills (for exemple Fireball ) and if you have chance, it will be actived, else, retry with another fireball ...