Most sets introduce around six new leader cards , which often shift the meta
Nothing at a low mana cost though, like blue, red, and even green have been getting
The ability to play Shatterskull Smashing as a Red-producing land - possibly untapped and on demand - might win the game
That means she reduces any damage being dealt to her by 1 point per Knight you have on your side, which surely means were going to see some Knight-focused decks in the meta, taking advantage of this excellent ability
Beyond those three, its anyones guess, but Ive been through the list of available mechanics and keywords to pick out what seems the most likely: Battlecry A Go Wide strategy is likely given the huge armies and battles in the series, and battlecry is a way to help break stalemates