In addition to the 215 card set there were six promo cards. The six are referred to as the Classic Accidental Inserts. They are all rare to extremely rare. The rarest are the Any Power Teamwork (6A+0+0) picturing Captain America, Spider-man, and Wolverine; and the Tactic Artifact Avenger's ID Card (6I+5A) picturing the Hulk and Wasp. The next rarest are the Basic Universe (6I+3) Xavier Protocols picturing Professor X with several X-Men in the background on computer screens, including Wolverine; and the Any Character Deal with the Devil picturing Emplate and White Queen. The easiest of these rare cards are the Location Krakoa picturing the X-Men; and the Tactic Artifact picturing Nightcrawler/Errol Flynn shape shifting.