MTG Duel Decks: Nissa vs. Ob Nixilis
Magic The Gathering Duel Decks: Nissa vs. Ob Nixilis - Rules of Play says:
The stakes are high as Nissa and Ob Nixilis fight to control the power of the Khalni Heart. Who will prevail? Each dual deck box comes with 2 pre-constructed 60 card decks which have been specially designed with there own individual play style as well as being designed to duel each other!