In Trials with this concept, I would imagine Sunsingers and Defenders to rule the court. Then again, Sunbreakers and Stormcallers could be OP in groups of the same class since their Orbs of Light abilities. Gunslingers would probably kick the bucket, Bladedancers wouldn't be the best either... Voidwalkers could do some interesting plays with Hysteria. Strikers and Nightstalkers would probably be average.