Ideally, you want to try to accumulate razor petals with Razorpetal Lasher and Razorpetal Volley so you can discount them along with Malygos with Emperor Thaurissan on turn 6 then you coin Malygos on 7 and burst your opponent down.
But you don't have to rush it that fast since you have some handy tools to stay alive and stall the game, cards like Antique Healbot and Tomb Pillager is a way to keep up with the board and stay alive, not to mention a juicy Edwin VanCleef after a good auctioneer can be an alternate win condition by itself if your opponent can't deal with it (believe it or not, it happens more often than you think).
-Starting with Gadgetzan Auctioneer is a great advantage against Priest Warlock Druid or Mage as it allows you to draw the combo pieces faster against the control decks, along with Backstab and Razorpetal Lasher.
-Don't hold on too tight to your razorpetals, you can generate more than enough to burst your opponent down use them wisely to ping down scary minions if you are behind on the board, you can also use Eviscerate or Sinister Strike for burst obviously.
-Don't underestimate the power of your minions, a couple of razorpetal cards a Tomb Pillager and an Azure Drake can be enough to deal with your opponent some games, and we dont want to forget about Edwin VanCleef.
Hope you try the deck, good luck and have fun :)