A pre-constructed (precon) deck is a fully assembled, non-randomized Magic: The Gathering deck, most commonly for the Commander format, that is ready to play out of the box. Precons serve as an accessible starting point for new players, offering a defined 100-card deck with a featured commander and a clear theme or playstyle. While they can be upgraded with additional cards, they provide a playable and consistent experience for casual Commander games right away.