Advice on progressing to dream deck

Hey everyone, I've been playing this game for a couple of weeks already and been grinding some gold with a rdw that doesnt have lots of rares with moderate success, Im trying to make this deck: http://www.streamdecker.com/deck/32V0VjDc7K. What would be the best approach on spending my gold to craft the cards that are needed for it? Constructed event? Draft? Any help is appreciated :)