Commanders - I get the elegance of implying one passive effect with something there's only one of, a top discard pile card. But how reliable can it be in practice? Basically, I'm raising the thought: why aren't these using their own mat? Since you have multiple Commanders you seem to want to enable switching between different 'command modes' when there is more than one in a kingdom, and a mat would make this simpler, even if it is adding more components.
That Risen King giving a global effect on trash is well discussed. I firstly wonder when you'd choose to trash one and get an advantage out of it for yourself, and secondly if there is more than one in the trash, I think you'd gain a card per copy in the trash?
And the global effect theme doesn't stop there. Funeral takes a lot of setup that affects everybody. Who's going to be the one to get a Bridge on the mat? It's bound to be asked. Suppose somebody goes for it, adding Funeral and Bridge to their deck; everyone else rushes Bridges ignoring everything else, and then...what does he do now? He would even have to lose his Bridge and so fall behind. Or nobody does it because they're all depending on others, a bit like Bishop trashing. Perhaps if everyone's trashing Coppers someone could choose not to and make their Coppers Silvers, and this is the best use for it?
Border Wall shares a similarity with Lost Temple in that you use a Buy to do more, launch a junking Attack. Could be fun, though I'm confident this is a Peddler+ so costs at least $5.