I have only a couple of thoughts:
1) How is the Explorer's Hat working out for you? I haven't experimented with this card so you are in a better position to decide if it's working well or not. I think this card can potentially be powerful if the game goes long enough and you have enough extra mana to play it multiple times, but I also fear that it can be very slow and can hurt your tempo.
2) You may want to consider replacing Oasis Snapjaw. He can become very powerful with the buff from Houndmaster, but having to rely on the buff makes him situational, and aside from that he is underwh