OK, so u all know the talent presence of mind, from that theres something called arcane potency that gives u 30% more crit if you have presence of mind on you
so use presence of mind and then make instant food or mana gem and u keep the 30% more crit to ur next spell in duel or whatever with presence of mind off cooldown if u wait a bit
nothing big, but can be used in arena since cooldown is only 1 min 40 sec and there usually goes a little more than 40 sec before popping pom in arena