NOTE: This hero pack requires a copy of Marvel United: Base Game (Classic or X-Men)
This is a Kickstarter Exclusive and can only be found on the Promo Box

As you should be aware, when playing with the new Super Villain Mode, all players have an “ace up their sleeve” in the form of 1 Super Hero card per Hero, and 3 Super Villain cards for the Villain. These cards are each unique, with a specific event that may trigger them, and a unique effect the character gets to resolve, usually rescuing victory from the jaws of defeat.

Publisher: CMON

Source: https://www.kickstarter.com/projects/cmon/marvel-united-x-men/posts/3172863