I'm adding to the artifact count in the cube to strengthen a couple of cards. The volver cycle is the easiest to cut, as they mainly were sideboard or the 23rd card in a deck. I think the only one I'd miss in draft is Necravolver

Brass Herald is my initial choice over the more aggressively costed Adaptive Automaton, although I may end up adding automaton instead, depending on the play rate of herald. Herald is my first choice to make sure aggressive tribal decks don't get out of control.

Cabal ritual over Dark Ritual serves to slow black down a little bit early game, and stop turn 2 Tourach.