Mewtwo V-UNION #SWSH162 from SWSH Black Star Promos is a reverse holo promo card that currently sells for about $8.36 ungraded, with graded copies ranging from $29.99 at grade 9 to $79.99 at grade 10. A grade 10 copy sells for around $79.99, about 9.6× the $8.36 raw price, so high-grade copies are worth grading.