Deck seems quite strong. It does not feel annoying as librams and is fun to play. Yes, the sword is getting nerfed, but its main usage is to fight early aggresion and thin the deck so it should work just fine. Secret package is just too strong not to include.
I am 15/3 with this list. My only losses were to turn 2 Deck of Lunacy.
Sad part is, I got to play N’Zoth only once against control priest. I like the rest of the deck, including Ysera and Alexstrasza which both provide burst finisher and can be tutored with Redscale Dragontamer. Since the deck has no 4 cost cards it features Kazakus which is working very well in a midrange shell.