EDIT: After so many comments I will update here with some explanation of what I think, because Kolento has yet to play this deck again before I make a analysis.

From what I saw, if you miss some card from this list, or don't feel confortable with something put a Charged Hammer is the best thing. People comment that it can fit the spot of Feral Spirit.

Some people don't like two Earth Elemental, but in this deck you need to draw it to secure a win most of the time. Earth Elemental + Ancestral Spirit is a excellent combo that only is bad versusSilence, not so common in this meta.

Neptulon is there because you need the card advantage against other control decks. Think of it like the Varian Wrynn for Shaman. It is pretty hard to substitute it, but people are trying withSylvanas Windrunner and Ysera. Give it a try and post your thoughts! :)