Tarkir has enemy wedges and 5 warring clans, each representing a now extinct dragon. The structure will be large, small, large with a unique draft structure and time travel element.
I don’t have access to a computer for the next week, so all my posts are done mobile. Since twitter is the source for many things, and on the iphone I can’t download pictures (as far as I know) I’m stuck screenshoting. My apologies.