It can Sketch up to 25 attacks, as well as Sketching appendages for itself to fight with before hand. It can Sketch wings and Fly, it can Sketch springs on its feet and Bounce, it can Sketch and use a Guillotine, etc...

It just can't do anything really broken, like Sketching and detonating a nuke or whatever. Also, as far as I know, water can dissolve its ink.