Xerneas-EX #XY149 from XY Black Star Promos is a reverse holo promo card that currently sells for about $6.79 ungraded, with graded copies ranging from $13.00 at grade 7 to $125 at grade 10. A grade 10 copy sells for around $125, about 18× the $6.79 raw price, so high-grade copies are worth grading.