If you are looking for future meta teams with current ninjas, just watch videos from that version, most of them were already mentioned, also guy seems to be used in LM blitz. Skillbooks open up a lot more possibilities for current ninjas, some of them becoe meta, some not, I for one am waiting for a team, that can mystery every turn- ninjas like shikamaru, konan. Not top tier, nonetheless fun in use and very annoying. Asuma has interesting skillbreak as well, but it's a personal choice and a lot of "viable or not" will depend on that.