I just read when the second card was created, you can't farm it directly so it's left as a complete energy booster, other than that it has the same functions as the original card without sharing the energy of the first one.
God awful writing ruined a decent story, it's rather sad how many mistakes are made in this book. there are a ton of other stories that are really good with minimal mistakes. Author take the time to find a proofreader cause you obviously didn't use one on this story