Board Thread:Game Discussion/@comment-220.255.1.144-20141220103312/@comment-9605025-20150527200240

Yes, the higher rarities do cost a lot more to upgrade.

I know there is a tendency to keep all of the episode bonus cards you get and put them in the deck. However, that course of action may not be the best. I have gotten to the point were the non-upgraded cards do not make it into my deck. What I do instead is use copies to upgrade a single card. Just as the cost to upgrade has increased, so has the xp they give.

For instance, during this past event (Best of Episode - Me, Grimlock, King), I got a lot of Shockwave (15) AMC. Since the base stats didn't make it into my deck, I upgraded a single card with all other instances of the AMC that I got. By the end of the episode, it was at 110/115. Using a single Wheeljack (7) as fodder costs over 100k in credits but took the card being upgraded from level 1 to level 83.