Playing Cards? (Patreon)

Hey everyone, 

Since I started making this game I thought about making game cards of my characters, something like D&D or Gwent. I thought I would place these in the game as a collectible so players could hunt down rare cards, or finish special quests to earn others. I have even thought about merchandising these cards in Patreon so my Patrons can earn or purchase them if they like.

I just made a sample of what I have in mind and I'm sharing it with you to see what you think. 

Do you think this is a good idea or it has nothing to do with an Adult RPG?