Kingdra ex #131 from Scarlet & Violet Black Star Promos is a reverse holo promo card that currently sells for about $88.90 ungraded, with graded copies ranging from $58.00 at grade 7 to $390 at grade 10. TCGrader's AI has graded 7 copies of Kingdra ex (Scarlet & Violet Black Star Promos), averaging 8.5 overall. 43% scored 9 or higher, so a strong copy is achievable but far from guaranteed. A grade 10 copy sells for around $390, about 4.4× the $88.90 raw price, so high-grade copies are worth grading.