Dragon is one of those Magic terms that is in (nearly) every set. It's fun to play a deck full of dragons. But sometimes you wonder if dragons have any relatives. The Dragonkin batch lets you know who is related. I went back and forth on putting all the different reptilian races in the batch, but I went with the fantastical instead of the mundane. I still love lizards, turtles, and crocodiles, but they are not quite dragons.