The only big problem with the deck presented is it has no real inevitability. Its ability to push a win out is not strong. So, the way to play is control board with wraithlings and bw a tempo deck. Botable possible options are mirrorim to add more furiosa into the deck, they are that vital, or soulshatter to be able to outrace mythrons easier.
As is, I feel this is the best this deck can preform for the meta, but a possible inclusion is grove lion. (Very Probably sub optimal, but its pretty funny and no one expects it) it allows for slightly more survivability, but because artifacts are so important it works wonders to protect them.