New to the game? There are 5 Starter Decks in total; one for each prism. Each set has 30 cards.
Heroes determine the types of cards you can wield in a match and therefore are tied to Starter decks. As you level up, you will unlock the different prisms and their corresponding Starter decks. The 5 Starter decks will grant a new player +150 Base cards which can be used to build custom decks so you can start playing Constructed mode right away.
Be sure to check your Skypass and claim the Heroes/Starter Decks you earned so you can start using them!