It just looks like a more advanced version of UHC. Also, if you've only seen it on one server, we'd have to make sure that they're okay with using their original idea. Anyway, support.
There are differences from it to uhc for example, because the ores respawn and there are set mines, getting resources is much less grindey. Also there are 4 large teams rather than free for all or teams of 2. Not to mention the classes, and nexus put a twist on it so if you die you can respawn till your nexus is destroyed, that in itself is a big difference.
