I really want to try a MoF build, but I'd like some feedback before I take the plunge. I am shooting for AoE primarily.

http://nwcalc.com/cw?b=i3i:26rtir:1d...0000&h=1&p=mof

At-will: Scorch, Chilling
Tab: Conduit
Encounter: Fanning, Shard, Steal Time
Daily: Furious, ?

Any advice on passives?