The artifact bit is VERY important, as in you get to have a Voltaic Key (1 drop Artifact, Pay 1, Tap: Untap target artifact.) Minister of Inquiries: [Category 2] ETB yield is 2 Energy for 1 mana, then you can spend 1 Energy to mill for three
Rather than join the artifact party black spends its time off in its own world
Casting Fireballs and Lightning Bolts across the battle
Sigarda, Host of Herons Forcing you to sacrifice your Hexproof creature is one of the main forms of defence your opponents have
They also have a big old chunk of text that reads, Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad, the Grim deals 1 damage to each opponent. That means that your milling is killing, and you can just be chilling
Trust me, try cutting Sol Ring for this in one deck