Sanjuro is a slightly lighter sequel to the rather cynical Yojimbo. I didn't get into Kagemusha and may just need to rewatch it...I can barely remember anything in it.
Dreams has a few effective scenes. A ghost army confronting a guy, and Martin Scorsese showing up to give a very awkward cameo performance as Vincent Van Gogh.
He wrote the original script for the 1980s Eric Roberts/Jon Voight thriller Runaway Train.