White Kyurem #XY81 from XY Black Star Promos is a reverse holo promo card that currently sells for about $33.00 ungraded, with graded copies ranging from $39.38 at grade 7 to $655 at grade 10. A grade 10 copy sells for around $655, about 20× the $33.00 raw price, so high-grade copies are worth grading.