Sylveon ex #156 from Prismatic Evolutions is a holo illustration_rare card that currently sells for about $476 ungraded, with graded copies ranging from $400 at grade 7 to $475 at grade 10. TCGrader's AI has graded 26 copies of Sylveon ex (Prismatic Evolutions), averaging 8.9 overall. 73% scored 9 or higher, so clean copies are common and centering usually decides the top grades. A grade 10 copy sells for around $475 vs $476 raw. That's a modest premium, so grading only pays off for near-perfect copies.