Meh the challanges for cards are useless. You will get them for completing mission too. I wan't some that i otherwise will need wb. if u don't belive me check the wiki
I't wold be nice if we got to make our own commander... then you could add skills and see health lowering after the power of the skill for an example: hp11 rally all 1
The commander often is the most stupid card... since it always rally's the wrong unit... the other cards are smarter :( please let us control our commander...