I noticed this while looking through a error box and finding two of these and two Gerald Young cards with identical errors. Possibly a white effect meant for another card. As of now the rarity is unknown as this error to my knowledge I am the first to realize it. Keep in mind I do not consider "no dots", "fish eye", "print defects" etc. errors but this is different. The "Ghost Slash" is identical on all and exactly in the same spots. In addition is identical to the Gerald Young card I will be adding shortly below. Does not appear on any other cards from the set. What makes it a error is the fact that both were corrected (no slash) later on in the production run.