Challenge Mode/Superman Godfall/Nightmare/Challenge Battle 4

Batman is required in all matches of challenge battle 4. It's a very easy condition to fulfill, as he has more versions than any other character, and among them are very strong cards such as Batman/Arkham Origins and Batman/Beyond Animated.

Generally speaking, the Batmen's practicality means challenge battle 4 shouldn't be any issue if you can do battle 5.