Were told the top cards across all decks: The most-played nonland cards across all main decks and sideboards were Fable of the Mirror-Breaker, Thoughtseize, Fatal Push, Llanowar Elves, Elvish Mystic, and Bonecrusher Giant. Ive been skeptical about how much higher Fable can go, but its already in need of a reprint and it is a Standard-legal rare
9 Combat Thresher Combat Thresher pulls a lot of weight for one of the smaller prototype cards in The Brothers War
It seems like a good deal if youre getting 10 packs for 50 gold
A similar card to consider is Wyleth, Soul of Steel but hes invariably better in the CZ than in the 99 most of the time (and even then, much better when you build around Equipment and Auras)
The end result is that The Ur-Dragon plays a "fair" game of Magic, winning all sorts of ways with lots of variety, while Scion of the Ur-Dragon is a hyper-consistent "unfair" deck looking to 1-shot opponents, combo off, or cheat tons of Dragons on to the battlefield
Collectors across the globe are now chasing these