New Feat (3.5) for Planetouched

[Tibbaerrohwen]

Sigil Waif

You were raised on the streets of the Cage, the City of Doors. On its harsh streets you learned to pick pockets and to con the Clueless.
Prerequisites: Must have been raised in Sigil, 1st level only.
Benefits: Regardless of your class Sleight of Hand, Open Locks, and Bluff are always class skills for you. In addition when using any of these skills directly on a creature from the Prime with less than 10 ranks of Knowledge (the Planes) you gain a +2 bonus.

So what does everyone here think?

I like it but it does feel allot like the City Slicker feat; same basic flavour. I don't see why being raised in Sigil would be a pre-req, because it seems any street-rat urban environment would do the same. I suppose it would be at the DM discression.