I don't have Beauty Marked, but I imagine I would use the 213 (275 works, too). They are fluff brushes, and they are what I use with any of my velvets (which beauty marked and black tied both are, yes?); for example, it works nicely with my climate blue, sketch and peppier. And, actually, I can make sketch blend - just make sure you have something good for blending as the other shadow involved.
I find it makes them pretty reasonable to work with. They still may not be the sexiest for blending, but you can sure as hell get them on.