Why would you want to play quest with more cards? When I play quest, I want to go through my deck as fast as possible. The longer the game takes, the more change you have of losing.
Side note for people new to this brawl: You only need to make a deck with at least 1 card. The rest is filled with random ones from your class/neutral! So everyone can partake even if you don't play Wild or wasn't around back then!
1
You get the golden versions from leveling up in Alterac.
5
Just choose a class and leave your deck empty. You get an autocomplete deck. (I had 5-6 cards in mine.)