One non-dragon commander that may like the Hellkite is Child of Alara, a WUBRG deck that may wipe the entire board to start things over, then reanimate threats like Two-Headed Hellkite to resume the offensive thanks to haste
It's fared better than Venusaur, at least, which barely makes the top ten
Watch for their being hundreds on auction in 3 or 4 months
Or that Teferi deck that gets Squee (Telepathy plus an extra three cards in hand) can make the game much more challenging
You can sacrifice any creature you control that dealt damage this turn to pay Treacherous Greed's additional cost, even if the permanent it dealt damage to is no longer on the battlefield or the player it dealt damage to is no longer in the game
Blend stealthy gameplay with a design celebrating Assassin's Creed, featuring artistic representation of your favorite characters from the franchise