Wizards is running a series of articles on
Gamma World 7th edition. It looks like the CCG aspect is integral to the game. Well, you don’t
have to buy anything beyond the starter box, but you’re encouraged to. It just seems like an unnecessary headache for the GM. Either the players who spend more money will have access to more/cooler powers, or the GM has the unenviable position of telling those players that they can’t use their cards because they’ll be using the same set for everyone.
If the booster packs sell well enough, I wouldn’t be surprised to see a CCG element added to 5e.