This loop is a masterclass in turning free artifacts into an endless menagerie, perfectly fueled by the interaction between Jinnie Fay, Jetmir's Second and Samwise Gamgee. By casting Shield Sphere for zero mana, you trigger Samwise Gamgee's ability to generate a Food token, which Jinnie Fay, Jetmir's Second immediately transforms into a hasty 2/2 Cat token instead. The arrival of that new Cat triggers Cloudstone Curio, allowing you to bounce the original Shield Sphere right back to your hand so the whole cycle can begin anew. Because Shield Sphere costs nothing to recast, this mechanical dance loops indefinitely to flood the board with infinite hasty tokens and endless enters-the-battlefield triggers.