By enchanting Siren of the Silent Song with Pemmin's Aura, you create a self-contained loop where the Aura's untap ability pays for itself the moment you have a way to generate blue mana. This is where A Realm Reborn shines, granting every permanent you control—including the Siren herself—the ability to tap for any color of mana to fund the process. Each time the Siren untaps, her inspired ability triggers to shred your opponents' hands and libraries until nothing is left.