I did a search on Arena Junkies for any teams containing four shamans and it came up with 16 teams worldwide. It must have blocked out a lot of the lower rated as there surely is more than 16 teams. Here's the site and Ellay seems to be the only 2.1k+ multiboxer --- was hoping for more . The five-shaman teams from Taiwan and China are individual players.

http://www.arenajunkies.com/rankings...Shaman/Shaman/