Out of a set of roughly 300 cards, the inclusion of Banding as a mechanic only makes sense if the designers thought that some players would be able to play many banding creatures out of those two commons
It plays lots of creatures, as seen on Altar Ibn-La'Ahad, sacrifices permanents for value as with Caesar, Legion's Emperor, and wants to run the board in combat with cards like Isshin, Two Heavens as One, Brutal Hordechief, and Zurgo Helmsmasher
Before we get to those, however, Leyline of Resonance is undeniably the big rebalance of today
Radiant Ruby & Shining Sapphire are still only rumours and you can read latest info here: TCG News Section and Radiant Ruby & Shining Sapphire Any Confirmation
This card focuses on the white, red, and colorless artifacts that want to attack often