My fave adventure books from the classic Marvel Super-Heroes RPG was the cosmic series - Cosmos Cubed, Ragnarok and Roll and Left Hand of Eternity.
Probably one of the biggest reasons I developed a fondness for Marvel's cosmic characters.
There are stats in the books but there were no cards, which would've been pretty cool.
So here are some I put together for the game.
The books, and the core rules, can be downloaded from ClassicMarvelForever.