While waiting for the new Dresden files book I've been reading the Iron Druid series. And it's got some fun stuff in there. Most interesting is the Druidic magic. Which I think could fall easily under a category of sponsored magic.
But there's two items of power that might be interesting to incorporate in to a dresden files game.
There's Morreltach, which is enchanted to kill any foe with even the slightest injury.
And Fraggeras, a sword that can cut through any armor, conjure wind and when held to someone's throat.
Fraggeras would be fairly easy to stat giving access to offensive channeling (air), a high weapon rating and giving you the option to easily interrogate someone when they are taken out. Maybe the weapon as some aspects to reflect it's incredible sharpness.
But Morreltach, I've got no idea how to stat such a deadly weapon. One consequence and you're boned. How would you do this?