So I've been doing a little bit of Runewars content on my channel so far, including some of the unboxings for the most recent expansions. (Also have a contest going right now giving away a Star Wars Celebration Exclusive Funko Pop Rey w/Speeder)   What I have found to be bizarre is that the Spearmen didn't have any upgrade cards that were exclusive to them.  I suppose if you are only buying a single faction then it would be a way for you to get certain upgrades that may be ex