M Swampert-EX #XY87 from XY Black Star Promos is a reverse holo promo card that currently sells for about $490 ungraded, with graded copies ranging from $850 at grade 7 to $13,450 at grade 10. TCGrader's AI has graded 5 copies of M Swampert-EX (XY Black Star Promos), averaging 7.4 overall. Only 20% scored 9 or higher, so genuinely mint copies of this card are scarce. A grade 10 copy sells for around $13,450, about 27× the $490 raw price, so high-grade copies are worth grading.