Zekrom ex #166 from Black Bolt is a holo illustration_rare card that currently sells for about $252 ungraded, with graded copies ranging from $193 at grade 7 to $510 at grade 10. TCGrader's AI has graded 6 copies of Zekrom ex (Black Bolt), averaging 8.5 overall. 33% scored 9 or higher, so a strong copy is achievable but far from guaranteed. A grade 10 copy sells for around $510, about 2× the $252 raw price, so high-grade copies are worth grading.