He may block any eligible attacking creature, including one that's attacking him
If you can read from your opponents that they live on self-mill, or rely on a discard outlet, there's an opportunity to make an army out of advisors and win, but otherwise, this is a good way to trigger mill if you like cards such as Deepmuck Desperado, The Water Crystal, and Zellix, Sanity Flayer
Limited attendance kept supply low
You can only use each of the following effects of "K9-66b Lantern" once per turn
Yeah, Folk Hero wants you to keep your commander alive and cast the creatures you sleeved up, but isnt that the only thing your deck is designed to do humans/soldiers/warriors/spirits players