The Dark Sacrifice deck rewards you for cleverly and mercilessly sacrificing your own Human creatures to advance your evil agenda. It's got three main parts: cards that like to sacrifice Humans, cards that reward you for sacrificing Humans, and Humans that like to be sacrificed.

What Humans want to lay down their lives? Doomed Traveler, Elgaud Inquisitor, and Mausoleum Guard each create 1/1 Spirit creature tokens with flying when they die, and the same is true of any Human equipped with Avacyn's Collar. Alternately, Elder Cathar makes one of your other creatures bigger when it dies.