Greninja #XY162 from XY Black Star Promos is a reverse holo promo card that currently sells for about $4.93 ungraded, with graded copies ranging from $8.44 at grade 7 to $73.82 at grade 10. A grade 10 copy sells for around $73.82, about 15× the $4.93 raw price, so high-grade copies are worth grading.