This clever little loop turns a simple Vampire into a self-sustaining engine of life and bone, legal in formats like Commander and Legacy. Warren Soultrader acts as the ultimate altar, letting you sacrifice both the creature you cast and the token it brings along to generate precious Treasure tokens and fuel your life total. That life gain is the vital spark: it satisfies Oathsworn Vampire's condition to crawl right back out of the graveyard for another go-around. Meanwhile, Anointer Priest watches the token parade march in and quietly feeds you the life you need to keep paying Warren Soultrader's costs. Best of all, Edgar Markov anchors the whole sequence from the command zone or battlefield, his Eminence ability ensuring that every single casting of Oathsworn Vampire automatically summons the extra body required to keep the sacrifice machine running.