Mulligans
I have been having a lot of fun with this deck and it performs better than I thought it would. The biggest thing to know with this deck like with most is what kind of opponent you will be facing. Aggro is definitely the hardest match up with the lack of mass removal spells in the early game in order to have a consistent Spiteful Summoner. It does have some lower level cards to try and stall in this case such as the wax elemental which also synergizes with the Hadronox. They can be life savers if you get them early on and should be kept against aggro decks. The Plated beetle is also a good body and gives you some needed extra health. Otherwise you want to try and keep any other ramp cards especially if you have a Spiteful Summoner in hand.
If playing against a more control style deck you may want to keep some of the silence minions, specifically Warlocks.
The Hadronox can be difficult to trigger right off the bat so you have to be aware how many silence cards your opponent has left. If it is likely to get silenced or even worse stolen by the dreaded Twilight Accolye/ Cabal Shadow priest combo, you need to kill it the same turn you play it. This is made difficult by the lack of Naturalize, but still doable by using the Twig of the World Tree to get an additional 10 mana and then dropping the Carnivorous Cube on it. The Twig of the World Tree can also be used in combination with Ixlid as well for some fun combos.
If all else fails N’Zoth will give you a lot of minions back.