Here is another list that has been played to rank 1 legend. Have a play with this Rank 1 Legend NA Midrange Shaman Season 30 deck if you want to climb the ladder with a decent win ratio.
There have been a number of midrange Shaman ladder lists and they all perform really well. They are not the hardest decks to play either, so if you really can’t ladder up with this deck you need to go over the fundamentals and improve your understanding of the matchups.