There is a minimum of 40 cards per deck. There is no limit, but you shouldn't have any more than 60, because that decreases the chances of getting the cards you need.
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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.
You may have a total of 15 fusion and synchro monsters in your extra deck(renamed from fusion deck with the addition of synchro monsters)