Board Thread:Questions and Answers/@comment-150.135.210.111-20131119015855

So I don't usually look at my battle replays, but I saw something weird earlier. Someone attacking me for my sealstone starts with the usual five card lineup, and then their team shifts over to the left, revealing a sixth card for a second, before going back to the original five.

What's up with that? Is this common and I just haven't seen it because I don't pay attention to replays? 