What you were expecting to happen, and what actually happened?
Matches not costing any gold, in both challenges and PvP.
What are the steps to make it happen again?
Just enter any battle.
Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!
Now as much as I’m enjoying the free battles, I guess the right thing to do is to bring it to a devs attention. This occured before and after the weekly reset (I waited to see if it was a bug that would be fixed with the reset)