Zekrom ex #166 from Black Bolt is a holo illustration_rare card that currently sells for about $219 ungraded, with graded copies ranging from $190 at grade 7 to $385 at grade 10. TCGrader's AI has graded 5 copies of Zekrom ex (Black Bolt), averaging 8.4 overall. Only 20% scored 9 or higher, so genuinely mint copies of this card are scarce. A grade 10 copy sells for around $385 vs $219 raw. That's a modest premium, so grading only pays off for near-perfect copies.