How to Play Yu Gi Oh! Beginner's Guide & Rulebook How many cards should my deck have? I'd say **40**. Yeah 41 or 42 won't hurt a lot, but still the probability of drawing a starter already decreases with that number. Many The Best Yu Gi Oh Structure Decks To Buy Right Now TCGplayer I tried to trim this hero deck down to 40 cards. how many bricks do i still have and can i build a house with them? : r masterduel