Mostly for a brawl like this, just use minions with effects, usually the higher mana ones. Big one is (Rafaam) Get his buff card and use it on one of your minions. Use spells/archmage for fireballs galore.
Argent Squire- good for divine shields
Shade of Naxx- starts at 1/1 and buffs each time and most of the time your opponent wont be able to deal with it.
Emperor T- Good to lower your spell cards if you have them in hand
Dr. Boom - get 3 bodys on the field
Kelthuzad - good against classes that cant kill it (try putting it behind a taunt) (useless against mage/druid/rogue
Alexstrasza- Pretty self explanatory , 1 mana get your opponent to 15 health.
Malygos - 1 mana buff your spells up, blast em in the face