So I'm running Secret Mage right now, but I don't have Babbling Book, Yoggs, Medivh, or Pyros. Should I spent the time grinding gold to unlock all of the quests to get Babbling to Medivh, or should I spent my time spamming Old God Packs until I can grab Yoggs or something comparable?

Alternatively, what would be good changes/additions to the deck as it is now (Aside from the placeholder cards I run).