By enlisting Biomancer's Familiar, the cost to activate Emiel the Blessed's blinking ability is reduced from three mana down to a single {1}, allowing you to repeatedly exile and return Corsair Captain for the exact same mana investment you get back from sacrificing the Treasure token it creates upon arrival. Meanwhile, Corsair Captain's continuous lord effect gives all your other Pirates a static power and toughness boost as you loop their entrances and exits indefinitely.