After playing alot of normal quest highlander shaman, I found that it was difficult to control the board (mainly against druid) which often resulted in losses. So, I decided to add the dragon package. Crowd Roaster and Twin Tyrant are solid inclusions for this purpose as well as Twilight Drake for the nice stats.
Another problem I found with the original quest highlander shaman was that it could quickly run out of cards in hand while top meta decks still had a bunch of resources left in hand. Brightwing is brilliant as a cheap dragon. Additionally, Cobalt Spellkin is over-powered in this deck (or Shaman in general) as Shaman’s 1 cost spells are useful in a range of situations.
EDIT 1 : Replaced Lightning Storm with Scalerider
EDIT 2: Replaced Spellbreaker with Scaleworm
EDIT 3: Removed galakrond package and replaced with powerful battlecry cards.