Two-headed Hunter // Twice the rage

Like everyone I've started playing a slickshot prowess deck. I've been reading through a lot of lists but noone seems to be playing [[Two-headed Hunter // Twice the rage]]? I've been playing this card and it hits super hard. It basically makes you do somewhere between 16 and 24 damage in turn three when you have it in your opening hand and it gives you an extra creature if the game goes long. Won last weeks FNM with it, and I usally don't win... Have I not been looking at the right lists or am I missing something why I should not be playing this card?