I like Phase 1. It can showcase anything from activity, to deckbuilding, to creativity, to game experience, to forum knowledge. All of these are relevant to War, Brawl, and/or Guilds, which all turn to masters first. Thus, I see it as a vital part of Trials.
That being said, it may be weighted slightly too much. I don't personally believe so, but I can see why people would.
Needless to say, I would support it appearing in Trials 7.