Speaking of competition, unlike some of our other Commanders, you really only have two choices if you want to play five-color Dragons in CommanderScion of the Ur-Dragon or The Ur-Dragonwhich means The Ur-Dragon will likely see a lot of play by default
If you can't, you lose the game
With a third song added to the deck, you can get a lot of use out of a new item, Sleepy's Flute
Mystery Booster 2 TypeInstant Collector Number15 Rarityuncommon ArtistRaf Sarmento Exile target creature
The key is that her ability also reduces alternate and additional costs, so you also get a discount on awaken, kicker, overload, flashback, and buyback costs
Black is arguably the toughest color when it comes to removing enchantments opponents have on the battlefield, so utilizing blacks ability to discard and force opponents to sacrifice is going to be key, among other threats as well