You’ve seen the spoilers and you know what Rise of the Eldrazi is all about. Then here is one. A big one:

Eldrazi! These mysterious entities have been awakened, and all of Zendikar is about to pay for it. The land has served as a prison for these astral monstrosities for millennia, but no longer. it serves as a sign of what’s to come. Huge powerful creatures that ravage the land … and very soon, your opponents ”