This looping engine relies on Training Grounds to reduce Emiel the Blessed's blink ability to just a single generic mana, making it cheap enough to sustain. By repeatedly targeting Corsair Captain with Emiel the Blessed, you trigger the Captain's entrance ability over and over to continuously manufacture fresh Treasure tokens. Sacrificing each newly minted Treasure effortlessly refunds the exact mana needed to keep the cycle spinning, netting you an infinite stream of creature leaves-the-battlefield and enters-the-battlefield triggers.