User blog comment:Khaladar/Magicite Orb/@comment-4604508-20120606021451/@comment-4834593-20120610153804

It procs on auto-attacks. AoE procs 1/3rd spell vamp, so that wouldn't be a problem. Or do you want to say abilities early game have the potential to deal 150% of the damage you can deal with auto-attacks? Auto-attacks don't have cooldown, abilities do.