Rayquaza ex #39 from Nintendo Black Star Promos is a reverse holo promo card that currently sells for about $227 ungraded, with graded copies ranging from $810 at grade 7 to $18,915 at grade 10. TCGrader's AI has graded 7 copies of Rayquaza ex (Nintendo Black Star Promos), averaging 6.4 overall. A grade 10 copy sells for around $18,915, about 83× the $227 raw price, so high-grade copies are worth grading.