Magnus The Traitor is my favourite warcaster. I've always liked the concept of mercenaries and was very excited when it was first released a long time ago... it was my first warcaster and I bought the boxed set twice to get all his custom warjacks...
I used him even if he was not that good, loved the idea of deserters and I always came back to use him... now with MKII rules and Magnus Agenda dedicated list he looks cool and wins more often
Andres