[[Isperia the Inscrutable]]
This is the only commander deck I've consistently kept around over the years. I don't remember how I discovered this card, but I think it's a neat ability and the commander itself feels flavourful and badass. I started playing during Return to Ravnica, which perhaps added a bonus feeling of "wow, it's the original Isperia!".
My deck isn't terribly good since I don't play Commander very competetively. I've tried to have sphinxes and stuff that feel badass and fitting for the deck instead of busted combos or whatever. [[Medomai the Ageless]] is a typical target to search for.
The only "combo" I can think of off the top of my head (been a while since I've played the deck) is [[Bruna, the Fading Light]] and [[Gisela, the Broken Blade]]. I think that combo is hilarious due to the name of the melded card: Brisela. We ship Brisela.