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These days, there's two ways to build Rakdos Sacrifice. You can go for Ally Warfield's aggressive build with Dreadhorde Butcher and Gutterbones, or you can try going slower, and grind your opponents to dust with Kroxa, Titan of Death's Hunger.
This is the Kroxa version that Mikulas Dio played in the MagicFest Online Weekly Championship last weekend. He and Ally Warfield both made Top 8 with their respective lists, so they're both viable—which one you play will come down to personal preference. Mire Triton and Tymaret Calls the Dead fill your graveyard with bodies, setting up Kroxa to escape and wreak havoc on your opponent's hand and face. Kinda like a bad rash.