Greninja V-UNION #SWSH157 from SWSH Black Star Promos is a reverse holo promo card that currently sells for about $6.30 ungraded, with graded copies ranging from $74.00 at grade 9 to $180 at grade 10. A grade 10 copy sells for around $180, about 29× the $6.30 raw price, so high-grade copies are worth grading.