Harbinger Celestia 3TK

Hello guys, it is my first post. I introduce to you the almighty Harbinger Celestia 3TK( 3-turn-kill) deck.
The combo is simple:

Step 1: You use Emperor Thaurissan and Drakkari Enchanter to reduce card cost in your deck by 2.
Step 2: You play Harbinger Celestia and Treachery her to your opponent.
Step 3: Make sure that your health is over 15. You play Unlicensed Apothecary so that Harbinger becomes the Demon, followed by Brann Bronzebeard , 2X Corpse Raiser the Apothecary, Treachery Apothecary to your opponent to make it deal 5 damage first, then you Sacrificial Pact the Apothecary to make more copies, 45 damage will be dealt to opponent face.

Have fun with her bros. Harbinger is not trash. Let use her in the right way!