Mewtwo-EX #XY125 from XY Black Star Promos is a reverse holo promo card that currently sells for about $74.90 ungraded, with graded copies ranging from $130 at grade 7 to $14,499 at grade 10. TCGrader's AI has graded 5 copies of Mewtwo-EX (XY Black Star Promos), averaging 8.7 overall. 60% scored 9 or higher, so clean copies are common and centering usually decides the top grades. A grade 10 copy sells for around $14,499, about 194× the $74.90 raw price, so high-grade copies are worth grading.