Hidden Arsenal 7: Knight of Stars certainly brings some game-changing Rank 4 Xyz Monsters! Lavalval Chain might have the “Laval” name, and it is awesome in Lavals, but it’s also one of the most flexible Xyz Monsters of all time. With two stellar effects and no restrictions on its Xyz Materials, Lavalval Chain’s going to be showing up in a lot of Extra Decks over the coming months.