Krookodile #137 from Black Bolt is a illustration_rare card that currently sells for about $45.50 ungraded, with graded copies ranging from $24.00 at grade 7 to $550 at grade 10. TCGrader's AI has graded 5 copies of Krookodile (Black Bolt), averaging 8.6 overall. 40% scored 9 or higher, so a strong copy is achievable but far from guaranteed. A grade 10 copy sells for around $550, about 12× the $45.50 raw price, so high-grade copies are worth grading.