United in Stormwind Cards List & Guide
I like the build your deck brawls the best..
They could give a small amount of bonus exp for the rewards track for winning brawls.
Because it is really rare I play more after my one win.
On the top of my head I have three ideas
1. Make a deck with just creatures in it. It could be a demon brawl, so just demon creatures. A murloc brawl, so just murlocs. A elemental brawl, so just elementals... etc
2. Make a three of each cost deck. Use any cards, but you must put in three 1 cost, three 2 cost, three 3 cost cards.. etc.
3. Make a deck with limitations to just basic cards, just basic and legendaries, just rare and legendaries or..