Cast Oathsworn Vampire either from your hand or graveyard by paying 1.
Edgar triggers, creating a 1/1 Vampire creature token.
When the Vampire and Oathsworn Vampire enter, Soul's Attendant triggers twice, causing you to gain 2 life.
Activate Warren Soultrader twice by paying 2 life and sacrificing Oathsworn Vampire and the Vampire token, creating two Treasure tokens.
Activate two Treasures by tapping and sacrificing them, adding 1.
Repeat.
This clever loop feeds on itself by turning the lifecycle of a single Vampire into a self-sustaining engine of life and mana. When you cast Oathsworn Vampire, Edgar Markov's *Eminence* ability immediately steps in to double your creature count, dropping both the caster and a bonus token onto the battlefield. Soul's Attendant joyfully cashes in on these arrivals by padding your life total, which crucially unlocks Oathsworn Vampire's ability to be recast right back out of the graveyard. Finally, Warren Soultrader gladly converts those bodies into the very Treasures and life-payments needed to fund the next iteration of the cycle, looping endlessly to generate infinite triggers and resources.