Sideboard
A sideboard is a collection of 15 cards that a player may bring to a game (often tournament) of Magic: The Gathering.
In conventional games, each player is allowed to bring 15 cards (in addition to his main deck) to the game. These cards are referred to as the sideboard. Players are not required to have a sideboard; but, if a player does have one, it must be exactly 15 cards, no more, no less. After the first and second game of a match, each player is allowed to swap cards in their deck for cards in their sideboard. This is a 1-for-1 swap, so both the player's deck and sideboard must remain the same size (often 60, and exactly 15). The player's deck must still be legal after sideboarding (for example, if a player already has four Llanowar Elves in his or her deck, he or she can't sideboard in two more).
Sideboarding helps a player address the weaknesses of his or her deck against a certain opponent. For example, if a player consistently lose games against anyone who is playing red "burn" spells like Ghitu Fire and Urza's Rage, then the player may want to put four Chill (so as to "hose" red by increasing the spells' playing cost) or maybe four Ivory Mask (to prevent the targeting of a player) in his or her sideboard.
Sideboard Examples
Black
- Deathmark - Destroy a green or white creature
Blue
Green
- Naturalize - Green's Disenchant
- Uktabi Orangutan - 2/2 creature that destroys an artifact when it comes in play
Red
- Blood Moon - Hoses decks that rely on many non-basic lands by turning them into mountains
- Boil and Boiling Seas - Destroys all islands
- Rack and Ruin - Destroy 2 artifacts
White
- Honorable Passage - Prevent damage from a source, if its red then reverse that damage
Land
- Wasteland - Destroy a non-basic land
References
Essential Magic - "What's a Sideboard?"
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