Priest seems far more well-suited to this Brawl than Mage. Mind Control is a HUGE swing if you can make it turn 10, not only do you take one of their minions, but you get a Deathwing or Sea Giant. Mind Vision can use their cards against them especially if you only have basic cards. Shadow Word: Death is another great swing card, by taking out one of their minions and spawning one of your own. Holy Nova will do well against large board, and the extra Spell Power from Archmage can help boost Nova and Holy Smite.