Bad news Card Battlers, multiplayer match making is currently not functioning. Recently, I have changed certain details of my Unity subscription and this caused some gears to grind.
Here is the list of features currently unavailable:
*Casual
*Find Game
*Create Game
Ranked play should still be functional, but some issues with match making have been reported for that feature as well. For now, it's best to not use Ranked Play either.
We are working as fast as we can to correct this issue, and multiplayer should be back up by the November update, or earlier. However, most of this is in Unity's hands and not ours.
Sorry for the trouble. In the mean time, I recommend that y'all try out our excellent single player game modes. I am especially proud of story mode!