Gideon, Martial Paragon #270 from Amonkhet is a foil mythic card that currently sells for about $1.06 ungraded, with graded copies ranging from $9.59 at grade 7 to $10.50 at grade 8. A grade 8 copy sells for around $10.50, about 9.9× the $1.06 raw price, so high-grade copies are worth grading.