In any case, the black Phyrexian Dominus is (unsurprisingly) a great card for aristocrats
Its a fantastic way to protect your party members and continue to reap the benefits of having a full party
MTG has many mechanics that revolve around artifact numbers and density, so we have not only affinity cards here, but also improvise, metalcraft, and other artifact-matters mechanics and cards
Its super effective as a Voltron commander because it gets to attack four times a turn cycle, so you basically get three additional combats a turn
Once he has died once, you need to hit seven mana, in a deck without green, to replay him
The kicker is that when one of your creatures dies, opponents lose one life, and when an opponent's creature dies, you gain 1 life