Race: Moon Godlike or Fire Godlike
20Int grant you 50% longer duration, 60% larger AOE and the Bonus AOE of a spell won't affect allies.
A wizard can be a top controller at merely level 1 by using Chill fog and Slicken(long duration & large AOE Blind & Prone under 20Int).
wizards also have a powerful spell Eldritch Aim, +15 Accuracy for 15 sec(20Int), makes crowd control spells almost 100% hit.
At higher level you can learn spells that can confuse, paralyze, hypnosis or even petrify enemies, and most of these spells are AOE(affect by Int).
With these advantages, a wizard can be a top controller in no doubt