Well technically prayer and meditation were the best for me because I mostly played on open battle.net. You made a paladin or sorceress, made him/her reach capped damage, health and mana. Then used the following auras. Prayer, meditation, thorns, holy freeze, holy fire, fanaticism and conviction. And tried to find the damage rhythm to negate other players prayer-aura. Before I quit I was the 2nd best on the European open ladder.