Side Deck

Side Deck
Japanese (ruby)	サイドデッキ
Japanese (romanized)	Saidodekki
English	Side Deck
Other names French: Side Deck German: Side Deck Italian: Side Deck Korean: 사이드 덱 Saideu Dek Portuguese: Deck Auxiliar Spanish: Side Deck Traditional Chinese: 備牌 Bèipái / Bei6 paai4

A Side Deck (Japanese: サイドデッキ Saidodekki) is a collection of between 1 and 15 cards, separate from the Main Deck. The Side Deck is used in Matches between Duels, to alter the contents of the Main or Extra Deck. This is done to better suit a strategy against an opponent's Deck.

The Side Deck is invaluable in tournament play. Facing certain Decks can be a walk in the park or a nightmare depending on the contents of your Side Deck. For example, a Burn Deck based around dealing direct damage through Card effects and Spell Cards could be easily countered by including several cards to prevent Life Point damage, such as "Des Wombat" or "Nature's Reflection". Familiarizing oneself with the most popular Decks is a great way to know what cards to put in a Side Deck.

Common Side Deck cards include various forms of Spell and Trap removal, such as "Twin Twisters", and cards that can directly counter common strategies, such as "Prohibition", "Chain Destruction" and "Royal Prison".

Since a Side Deck is not compulsory, a value of 0 for a Side Deck is considered legal. Any value between 0 and 15 inclusive is permissible.