Talk:Challenge Mode/@comment-8051271-20161110202653/@comment-30022027-20161111064304

LOL. Yeah like Oneanimal said, free promotions!

And besides, you can sell your excess cards for credits. 150k credits is pretty decent! To top it off, SS challenges are the only ones which gives you Silver Cards + Gear Locker + Gold Cards during the challenge.

Great for farming and buying some time to upgrade other characters.