With the start of the new year of Mammoth "inspired" standart deck probably will be not viable, so i just switch a theme of the deck to something like "Wild N'zoth Reno Quest Priest".
Saraad is pretty valuable card especially with 0-cost hero power. Just drop it on a table where are no good trades for your opponent or if you have a defender (any taunt probably).
Excavated evil is really good in many matchups, and it's also yours cheapest AoE (didn't include Kazakus' spells ofc). Don't forget to not use if it not REALLY necessary in a very grindy matchups (Reno mage, mirror, some kind of Control Warriors, etc.)