If a card appears on the banned list for your chosen format, then you may not include that card in your deck or sideboard. Second, the banned and restricted lists are format-specific, so a card that is banned in Modern may still be legal to play in Standard. It's important to note a couple of things: First, these lists apply only to Constructed formats and not Limited formats. These lists are made up of cards that are either not allowed at all, or allowed only in a very limited manner. To help maintain the diversity and health of the Magic tournament environment, a system of banned and restricted lists has been developed.

If there are plenty of viable options to play, there will be more players at more tournaments. In addition, different players enjoy playing different types of decks.

Why? If there were only a single viable deck to play, tournaments would quickly stagnate as players were forced to either play that deck or a deck built specifically to beat it. It is vitally important to ensure that there are multiple competitive decks for the tournament player to choose from. One key to the continued health of Magic is diversity.

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