Were long past the point where a 4/4 Flier for five is interesting, and the other upsides here arent particularly strong either
The power level of the original list is the strongest overall and it can also be put together much cheaper than some of the other lists, making it one of the best in terms of value as well
The Arcane Signet from the Mystery Booster 2 set, a special set dedicated to mixing up Chaos Drafts and celebrating unique design choices that Wizards of the Coast cant reproduce in regular sets, or isnt quite ready to branch out to
You can change things up around the edges by being more aggressive or more controlling and maybe adding a reanimation package, but it's hard to build a completely different style of Dragon deck
Unfortunately, Ghalta doesn't provide any value upon immediately hitting the battlefield, so you'll probably want to have some kind of removal protection or method of giving the Dinosaur haste to ensure casting the card is worthwhile