New spell from people of the sands. Seems interesting, if unclaified (proficiency penalties? size penalties? What's a "sword"?). I'm going to assume no size/proficiency penalties (I'm pretty sure a dev said none to the similar Hand of the Apprentice power) and at a minimum, the stuff that explicitly qualifies for a Tengu's Swordtrained+anything with "sword" in the name (In English at least, doubt a naginata would work even though it is 長刀)
The material component is non-neglibible and fairly heavy. Ideally you'll be scavanging non-magical weapons and destroying them, but False Focus lets you use any 100 GP. Any idea what the best sword <=100 GP is?
A Briar Blade or Dragon Slayer (enemy of all enemies and Mantis Blade are nice, but not as good and the curse on the first could be annoying) seems to be the obvious choice: No cost given, so you can find it in a material component pouch. You can also destroy artifact blades you want to destroy this way
The best that will NOT get you smacked seems to be Dagger with 6 size increases at 2d8 (and can be silver for 2d8-1 or cold iron with 2d6) with an 19-20 crit range or a sickle with 4 size increases that does 3d6 20/2x (Plus you just ripped off Death's signature attack. How cool is that?).