The focus of C+C will be on card selection, strategy, and budgeting
As you can see already, there are plenty of options that can be tailored to your particular strategy
Once youve done it, the answers are very specific
The Ur-Dragon's presence on the battlefield reduces the mana cost of your dragons and rewards you with card draw and free casting whenever your dragons attack
Getting free value for creatures entering and that includes through token production, flicker, or any other means, not just casting is a recipe for success
Burns key commons and uncommons may not spike quite so soon, but several of them are four-ofs in the same deck, and if the demand is real (as I suspect it is), they could be next to pop