The set Archenemy Nicol Bolas is 4 decks and 3 of those decks are battling one deck(the Nicol Bolas deck).  The three decks that are fighting Nicol Bolas are a green and blue deck the planeswalker in it is Nissa, World Waker.  The second deck is a pure red where the planeswalker is Chandra, Pyromaster.  Finally, there is the pure white deck and the planeswalker is Gideon Jura.