I ran an open space conversation a while back asking people what it feels, looks and sounds like when you are in that special, all too infrequent place you could call "magic."
This is what they came up with.
Right click the image to open full size.
Rather than take this checklist and apply it to your team it might be more useful to have a similar conversation with them. Perhaps a retrospective could be dedicated to what great teams are like to work in, and through that you could generate your own markers of good.