This clever loop relies on the constant recycling of Lesser Masticore, which uses its persist ability to return from the graveyard whenever it dies. Normally, the -1/-1 counter it enters with would eventually shut this down, but Curator Beastie provides a brilliant static boost—because Lesser Masticore is a colorless creature, it enters with two additional +1/+1 counters that immediately cancel out the persist penalty. This lets you feed the Masticore to Bloodflow Connoisseur over and over again, generating an endless stream of sacrifices, enters-the-battlefield triggers, and a massively growing connoisseur.