Mewtwo V #SWSH223 from SWSH Black Star Promos is a reverse holo promo card that currently sells for about $5.77 ungraded, with graded copies ranging from $15.29 at grade 9 to $200 at grade 10. A grade 10 copy sells for around $200, about 35× the $5.77 raw price, so high-grade copies are worth grading.