Do you need the same amount of yu gi oh cards to battle?

You need to have between 40 and 60 cards to make a Yu Gi Oh deck. The closer you get to 40, the more of a chance you'll get the card you need when you need it since the limit is 3 each on cards not on the limited list. Semi-limited is 2 and limited cards are just 1 each. So the fewer cards the better. I usually run 46 cards which is a good balance for me.