Armored Mewtwo #SM228 from SM Black Star Promos is a reverse holo promo card that currently sells for about $159 ungraded, with graded copies ranging from $179 at grade 7 to $9,770 at grade 10. TCGrader's AI has graded 16 copies of Armored Mewtwo (SM Black Star Promos), averaging 7.3 overall. A grade 10 copy sells for around $9,770, about 62× the $159 raw price, so high-grade copies are worth grading.