Sinew and Steel probably won't see much play outside of EDH [where I know I will happily play it] but that is some sweet, sweet art. Red will have a hell of a time killing anything that has this equipped.
This set sure is killing it in giving players a lot of things we've been wanting more of. More slivers [with new legend], more changelings [finally a changeling tribal legend plus fills in a lord for a lot of neglected fringe tribes], more snow [and full art snow lands to boot], complete the sword cycle, art tokens in the packs...dang. Still not sure just how much will be sliding into Modern though.