I like Dromoka, Ojutai, and Atakra does similar stuff to Bogardan. Koaghan is just aweful in commander and Silugmar is ok.
I played a commander based on the dragon Prossh, Skyraider of Kher for a while where Prossh + Food Chain made for some really funny interactions with cards like Ashnod's alter. Infinite mana out of nowhere. Could always also infinite loop mana with an Animate Dead and Worldgorger Dragon combo. If you play fetchable lands you can grab most with an Eternal Dragon cycling if you build the deck with extra W. Harbringer of the Hunt also just wrecks weenie decks at will.
RE: Magic: The Gathering | Draconic Dominiation Commander