Mewtwo V-UNION #SWSH161 from SWSH Black Star Promos is a reverse holo promo card that currently sells for about $19.99 ungraded, with graded copies ranging from $16.05 at grade 7 to $50.00 at grade 10. A grade 10 copy sells for around $50.00, about 2.5× the $19.99 raw price, so high-grade copies are worth grading.