Mulligans
When you hear “deathrattle” and “rogue”, you probably think about raptor rogue, but this deck isn’t about it. N’Zoth allows you to play a devastating combo, which can’t be controlled with such cards as “Brawl” “Lightbomb” and Freeze Mage combo. Ancient Harbinger Can help you draw the N’Zoth so there is a big chance of playing it on 10th turn and finish the game in 1 or 2 turns.
I don’t see why you couldn’t stick a Raptor or two in here, sure it doesn’t combo with your N’Zoth but it combos with half the other cards in your deck.