Hearthpwn

Antique Healbot = 2 turns 

Sludge Belcher= 2 turns

totem golems= 2 strikes to kill them. 

To last against the Orc, you need to count to 2. 

This deck functionality is identical to the suggested shaman deck in the guide, but I added some newer modern cards. Scrapyard colossus has a bigger edge than the bog elemental and alarm bots can help them cheat them into the ground (Make sure to at least have 2 taunts before doing this). Your objective over all should be giving ancestral spirit to Kel'thuzad but you can also use vivid spores to bring some extra minions, including anything summoned with N'Zoth or even an occasional white eyes/storm guardian that you will draw pretty fast if you held yourself for the combo, Alexstrasza and tuskarr totemic could be replaced, since the deck upgrades are powerful enough to withstand Malchezaar. Do not Hesitate to N'zoth early for one Colossus revive, one single colossus is enough to deplete Nasra for at least 2 turns. As I said, spamming your taunts and getting the Storm guardian is easy sicne you will go through your deck.

Sample hand to survive Nasra: 

1 piece of the combo + Stonehill defender/Tunnel trog/Lighning bolt/Another tunnel trog (Keep 2 if you have 1 lightning bolt) . Stonehill Defender should be enough to give you another upgraded taunt (Or any taunt will do). Make sure that your taunts will be always oriented to survive 2 attacks (+4hp). DO NOT KILL NASRA EARLY IF NO KEL'THUZAD HAD BEEN GIVE THE EXTRA DEATH RATTLE.  

https://imgur.com/a/KVsCF3l

If everything went well and you vivid spores ancestral spirit a Kel'thuzad you should have more than enough firepower to kill the boss without using Alex. Just make sure to have spored at least 1 or 2 taunt minions or to have at least a healthy Kel'thuzad in the field.Make sure to not overfill your field because that could lead you to have perma useless minions that can harm you in the long run. 

Spam taunts, embrace the call of Kel'thuzad. Nasra will also stop attacking whenever your minions power is a enough for her to kill herself. This deck by itself should be enough at least to last until single digits. 

You can White eyes with any taunt that returns itself in someway or another from the deck. 

Alexstrasza can be replaced with any legend taunt or any legendary that might aid you. Tuskarr totemic with anything that leaves and extra creature, those where incldued because its 2 creatures for 3. 

Use your ooze to destroy deathrattle weapons whenever Nasra tokens are 1 hp.