Under the newly released Master Rules, each player (in official Duels and tournaments) must follow the guidelines below:
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there is no limit
40
40 or more.
Well, the minimum in a yugioh deck is 40 cards maximum 80cards. Most people try to have a smaller deck over a larger deck, to get cards they need. About a 40-50 card deck is good.
Theres a No Deck Limit code where you can have 5 cards in your deck... the code is D21C31BE 0100AA00 121C31BE 0000EA00