W/B Cultist Sacrifice

The Father of Machines is a long dead phyrexian god, mostly forgotten. But there are still some in Urborg who still remember, and they perform these blood sacrifices to this day. While these performances are grimly fascinating... I wouldn't want to be the center of attention.

Cultist Sacrifice is a midrange deck that uses hordes of tokens to win. It uses these tokens to do a little bit of damage and then wins through a big pump spell, but more often than not, sacrifices those tokens in one big huge game winning play.

Prioritize any card that can produce more than 1 body such as Doomed Traveler or things that come back from the dead like Gutterbones, as well as anything that lets you sacrifice, such as Priest of Forgotten Gods. After that, look for a way to push damage through like Celestial Crusader or Cruel Celebrant.

The Aristocrats

Adding a Red splash you get on death triggers like Tibalt, Rakish Instigator and burn effects like Grim Lavamancer or Hellrider. Even threaten effects like Zealous Conscripts, so you can steal your opponents creatures and sacrifice them. Red can make the deck much more aggressive and churn out damage faster.