Sylveon ex #156 from Prismatic Evolutions is a holo illustration_rare card that currently sells for about $343 ungraded, with graded copies ranging from $316 at grade 7 to $1,020 at grade 10. TCGrader's AI has graded 32 copies of Sylveon ex (Prismatic Evolutions), averaging 8.9 overall. 75% scored 9 or higher, so clean copies are common and centering usually decides the top grades. A grade 10 copy sells for around $1,020, about 3× the $343 raw price, so high-grade copies are worth grading.