Move Creation Workshop

[Takanomiya Hijiri]

Besides that, I think you should give a rough baseline for how much usage the claws have.

You want more information? This is getting ridiculous... guys, it's just claws.

@Alex, you know you don't need big drawbacks for something this basic, right?

Look, here's an example of an already-approved claws move I got for my Alt:

Resilient China Claws (300)
(Physical Strength)
China has four five-fingered hands and two four-toed feet. Each of his digits is tipped by a razor-sharp, two-inch-long talon. Unlike most of China's body, these claws are as hard as diamond, and so can safely be used as weapons without breaking.

You don't need to mention how tiring they are to use, as it's assumed to be about as much as scratching someone... since they're just claws.

Yours should require a description of the transformation, the appearance of his arm, and the appearance of the claws themselves, including their length.
That last point is the most important. I'd also highly recommend including an image, since you are playing a non-original character and as such these things are easily available... a picture is worth a thousand words, y'know?

Here's what I would recommend (I'm omitting all the unnecessary drawbacks, but if you really want those then feel free to add them back in):

Claws (300)
(Physical Strength)
[spoiler][/spoiler]
Alex shifts the biomass in one of his hands into a four-digit, blade-like structure, with each 'claw' being approximately one and a half feet in length. The change effects his entire arm, causing it to take on a form resembling numerous wicked, sickly black tendrils wrapped around one another. The transformation takes three seconds, but requires no Focus, is not Fatiguing in itself, and he can move about normally during this time. The claws are slightly less durable than normal daggers, however if their blades do wear down or break during combat, Mercer can simply repeat the three-second transformation to repair or replace them.

That might not be the best image, it was just one I found quickly on Google Images... if you do decide to include one, you might want to have a more thorough look yourself to see if you can get anything better.
Also, I've based the length off the picture I included, however in some others the blades are shown to be longer or shorter, so you might want to change that, i dunno.