There are 6 clusters, including Normal server clusters
Additionally, there are a couple of servers that are not clusters, like Deviate Delight, Grobbulus (RP PVP servers), and Loetheb (intended for Latam players).
Sounds like what you are asking for is a new development feature. This is pretty solidly exemplified with language such as:
Maybe?! There are free transfers to the non-dead clusters from the dead servers.
