PSA 10 worthy HARD to come by in this condition The 1990 Impel Marvel Comics Grail Super Heroes Toy Biz Promo RARE Key Wolverine #10 trading card is a highly sought-after collectible item for fans of Marvel Comics and superhero memorabilia. As part of the Marvel Super Heroes set manufactured by Impel in 1990, this non-sport trading card features Wolverine as the key character. This rare promo card holds significant value and historical importance within the trading card community, making it a must-have for any avid collector.