I would scatterscroll that bitch. Skydancers aren't selling that great at the moment, in my experience (SELL YOU DAMN BABIES) so you want to try for a good color if you're gonna sell it anyway. You might end up with something you want to keep, or you might increase the value. You can't really make it less valuable with swamp, really.

I would breed the WC with the SD myself because I hate splitting clutches, but it depends. If you end up with like, three SD babies you'll probably make more in total than you would with getting one imp (which is usually the deal for WC studding) but you would have to be lucky in the clutch size and then manage to sell the little bastards. So it's kind of even but in different ways.