Main Deck
if you dont have the legends -- they can be replaced by lunar magus,, dreamsnatcher or (campaign) ponysnacher or some other decent 2 or 3 drop life steal / gain unit -
if you do play magus then I would recommend playing the power card that gives a nightfall trigger amethist waystone) in the deck at least 2 copies
Market
if you dont have the xenan site this can be replaced by some killer effect but if you go the magus route i would recommend twilight hunt to trigger nightfall
if you don't have office then this can be replaced by cruciation this is situational but will kill a single faction unit and give good life gain