Zygarde #XY129 from XY Black Star Promos is a reverse holo promo card that currently sells for about $8.20 ungraded, with graded copies ranging from $3.73 at grade 7 to $113 at grade 10. A grade 10 copy sells for around $113, about 14× the $8.20 raw price, so high-grade copies are worth grading.