Newbie questions

[Huntsman]

Finally bought the game and I'm reading like mad to prepare for my first MP game (where I am Pangaea) but I'm running into lots of vernacular here, like "SC" and "rainbow mage", etc.

Rainbow Mage I've figured out but what the heck does SC stand for, when in reference of a pretender build?

I'm also looking for advice for a *basic* Pangaea strategy. Nothing too fancy, just something to get a good foothold early on before I get squashed.

Thx!