Sylveon #XY04 from XY Black Star Promos is a reverse holo promo card that currently sells for about $18.00 ungraded, with graded copies ranging from $39.88 at grade 7 to $1,400 at grade 10. A grade 10 copy sells for around $1,400, about 78× the $18.00 raw price, so high-grade copies are worth grading.