Is it true only a number card can beat a number card? Me and my friend were dueling, and he used Utopia to attack Great Shogun Shien. Of course, they have the same attack, but he said that Utopia isn't defeated because he's a number card and Shien isn't. Having borrowed my other friend's Utopia for that duel, I realized it didn't say this on the card. I told him that, and he told me it was a secret ability. I told him there aren't any secret abilities, only in the anime, and he said I was wrong. I told him it wouldn't be fair if a card had a secret ability because then anyone could lie and say that a certain card had an ability. He said that he could still use the number card's secret ability because everyone knew what it was. I tried to tell him this wasn't true by google searching it, and 2 out of 2 people said it was only in the anime. He said they were wrong and were jealous of the number cards. So, could one of you settle this argument, possibly with proof?