I’m a big fan of cards, both the games you can play with them and in the abstract as graphically designed objects. This purpose if this thread is to share cards, trading or otherwise, that appeal to you for whatever reason. Here’s a few I like:
Odric, Lunarch Marshall has a wonderful Chase Stone painting for its art and a truly ridiculous text box to both the Magic player and non-Magic player alike:

I’ve always been a fan of the art style of a classic 52 card deck. You don’t really see this style much in modern illustration, yet in this one form it has persistently stuck around (this one’s in the public domain, too!)

I haven’t played Yu-Gi-Oh! in ages, but I always liked this stone fellow. I think stone creatures are an under explored design space. Stone weapons, too!:

What are some of your favorites, and why?