Impervious Greatwurm #273 from Guilds of Ravnica is a foil mythic card that currently sells for about $4.25 ungraded, with graded copies ranging from $38.00 at grade 9 to $42.00 at grade 9.5. A grade 9.5 copy sells for around $42.00, about 9.9× the $4.25 raw price, so high-grade copies are worth grading.