Mulligans
Tempo mage idea (Only 55 out of 135 cards are revealed yet). But not sure if mana wyrm, mana adict or questing adventerur is better so that will need some testing when the expension gets realeased. Auctioneer might be good but i think it is to slow cause you dont have a lot of free spells to cycle (unless you play apprentice) unlike rogue or druid.
If you run emisary or shooting star really depends on if you are facing a lot of aggro or more control/combo decks.
You could also run jepetto (new card 8 mana 6/6 draw 2 1/1 1 mana versions of minions from your deck cause you can highroll questing adevenurer, stargazer luna, cosmic anomely, vexcrow or archmage antonidas. Proably to slow but just something to think about.