I've had so many CCG ideas bouncing around in my head for YEARS, and I'm hoping this jam will be the thing that finally motivates me to follow through with one!
My current plan is a variation on an idea I had a while ago: A CCG where each card actually has three smaller card images on it, and when you play a card you choose which of those three to resolve. If anyone else likes that core idea, please don't hesitate to try something like that in your game! I cannot claim to own such a simple concept, and your version would undoubtedly be way different than mine anyway!!
Mine will be built from the ground up to support solo play, and also allow for 2 players head-to-head. The theme is gonna be futuristic with stuff like mechs, tanks, etc. Thinking of making all the common and uncommon cards available as a pay-what-you-want PDF, with the rare cards as a low-cost PDF, and hopefully also offer a printed version for those who don't want to print their own cards at home. (You can get packs of random cards printed at The Game Crafter so that's where I will probably offer the printed version!)