Quote from scourge of the kitchen table »I'll be trying this in my Horde of Notions deck where the major theme is ETB. I've got 18 creatures that directly benefit.
Sadly, Blade of Selves and the myriad ability exile the tokens at end of combat so Kokusho and other dies triggered creatures don't get quite so crazy. (That is unless you've got an instant speed sac outlet.)
Well, with Kokusho and other legendaries, the copies die instantly to the legend rule. So it is pretty stupid with some legends, namely Kokusho.