Before and after the quest is done, you play the deck as a normal spell-secret hunter.
Of course, you have to make at least 7 1mana drops from Halazzi, so your hand has to be fast (that's mostly why the curve is low) - you have to have max 4 cards in your hand when you play Halazzi (4-1+7=10).
EDIT: You can consider adding Zul'jin - that hero has to be tested. Rexxar hero power looks too good to be replaced tho..
EDIT2: Against aggros you can consider to mulligan the quest away - the deck looks overall solid (well, that's because spell hunter has a good matchup against aggro decks).
Not 100% sure about: