This loop is a masterclass in cost reduction, turning a blinking engine into a self-sustaining mana generator. Training Grounds lowers Emiel the Blessed’s activation cost down to just a single mana, making it cheap enough to repeatedly exile and return Patron of the Arts to the battlefield. Every time Patron of the Arts re-enters, its triggered ability creates a Treasure token that you can immediately sacrifice to pay for the next blink, leaving you with an endless cycle of enters-and-leaves-the-battlefield triggers.