how would they tag each other?
It would be like the War Games matches in NWA/WCW - two men (one from each team) start the match, and after a set amount of time another team member is released into the match until every man has entered the match. The only difference between War Games and EC is that it will have elimination rules and you can win by pin fall or submission. In War Games you only needed one fall via submission. I think this would be a very fun match especially seeing The Shield gain the early two on one advantage in the match.