Ya'll are silly if you think this isn't great. It's good by itself without mentioning synergy with Call to Adventure decks or Duel! decks. Plus all the silver hand synergy, and the value in general. Very good in short and long term. Played in Wild day 1.
Yes it makes Giggling Inventor look like trash at 7 mana in wild. Though to be fair, the inventor had it coming, I still think 6 would be perfect for his mana cost, but I doubt they will ever revisit it, unless they do a standard wide card buffing this next year like they did last year.