Mewtwo V-UNION #SWSH159 from SWSH Black Star Promos is a reverse holo promo card that currently sells for about $7.90 ungraded, with graded copies ranging from $77.50 at grade 9 to $75.00 at grade 10. A grade 10 copy sells for around $75.00, about 9.5× the $7.90 raw price, so high-grade copies are worth grading.