What makes RDM an easy DPS?

[Iscah]

Hit 40 white/black, manafication

You do this til your mana is 80/80 black and white

You don't actually want 80/80 though – you want over 80/80 and slightly uneven, ideally with a proc active for the higher element and (more importantly) not for the lower one, because you're about to trigger that with your Holy/Flare finisher.