Boardgamegeek https://boardgamegeek.com/boardgame/223049/custom-heroes
English - Custom Heroes is a card-crafting, climbing trick game in which plastic cards are added to sleeves in order to modify the cards already in those sleeves. Please note: Custom Heroes is shipped with a protective plastic film on each card which should be removed prior to play. Once removed the colors will be more vibrant and it will be easier to see cards in a stack inside a sleeve.
Ludovox http://ludovox.fr/jeu-de-societe/custom-heroes/
French - Custom Heroes est un jeu de cartes-crafting dans lequel des cartes plastiques transparentes sont ajoutées aux sleeves afin de modifier les cartes déjà dans ces sleeves (pochettes transparentes).