This loop transforms the endless cycle of life and death into an unstoppable engine, fueled by Shilgengar, Sire of Famine turning each sacrifice into a bounty of Blood tokens. Because Restless Apparition keeps returning to the battlefield via persist with a -1/-1 counter, Thran Vigil steps in to immediately neutralize that counter by placing a +1/+1 counter on it whenever it leaves the graveyard during your turn. This counter-cancellation ensures that Restless Apparition can be repeatedly sacrificed to Shilgengar without ever permanently staying in the graveyard, generating an infinite supply of Blood tokens, death triggers, and enters-the-battlefield value.