There are two ways to build a deck using crossover cards.
1. By Universe: This construction requires that your deck only includes cards from a single universe (class restrictions do not apply). Construct a deck using cards from the Cardfight!! Vanguard set and starter decks.
2. By Class: This construction requires that your deck only includes cards from your leader's class and/or the Neutral class (universe is ignored). Combine cards from the crossover set and starter decks with cards from other sets.