What powers should I give my sorcerrer?

[foostoofoo]

This is like my 3rd post on my in progress DeathGuard army, so this time I'm after this; what power should I give my Nurgle sorcerrer? Nurgles rot? Warptime? Wind of chaos? I'm hoping for some good ideas and the justification of why you'd choose them.

[RocketRollRebel]

I'm not a huge fan of sorcerers but I suppose I would go with wind of chaos since it can be a nasty little surprise for when he hops out of his rhino and cooks a squad.