MTG >Combos >Oathsworn Vampire +Edgar Markov +Phyrexian Altar +Cruel Celebrant +

With Edgar Markov as your commander and Cruel Celebrant in play, cast Oathsworn Vampire. Edgar Markov's ability will trigger, creating a 1/1 token Sacrifice Oathsworn Vampire and the token to Phyrexian Altar to add two black mana. Cruel Celebrant's ability will trigger, making the opponent lose 2 life and you to gain 2 life. Since you gained life, you can cast Oathsworn Vampire from your graveyard. Repeat the process.