I learn that there is prom bundle for the game. Someone can tell what cards are in this ? Thanks.

I believe it’s just alternate or extended art of the Core set heroes.

There are two sets. Both have the same art but with different styles.

GenCon: Full bleed cards with minimized text boxes

Release Kit: Done in a comic book cover style. Both sides put the hand size/HP in a Marvel-style box in the upper left, and the hero sides have the hero name done in the cover style from their books.

Thanks