Electrode #21 from Base Set is a rare card that currently sells for about $4.33 ungraded, with graded copies ranging from $22.50 at grade 7 to $247 at grade 10. TCGrader's AI has graded 3 copies of Electrode (Base Set), averaging 7.3 overall. A grade 10 copy sells for around $247, about 57× the $4.33 raw price, so high-grade copies are worth grading.