Yeah, I found it online as well. Wiki is notorious for posting homebrew feats and classes, but this one wasn't in the Homebrew section. Sadly, it sisn't say what the source was.
Our group rule is that if it isn't from an accepted source book, it has to be approved by the group. And while a "majority rule" technically applies, in practice when someone proposes or asks for such a vote, if the result is anything other than unanimous, the advocate withdraws the request. Since anyone can be a DM at our table, it's considered good form to get every DM's approval.
My group approved, so it's in.
Still, if it's on paper someplace, I'd like to know what book it's from.