I don't feel like I'd cheat. But I'm not talking about it. If somebody goes without a deck list, then that person can literately say 'dude, I have it in deck' to every single card that don't fit deck and is too situational to be included in most decks. Of course somebody may play questionable cards ([s]like Mokey Mokey[/s], oh wait he is OP, like [url=http://yugioh.wikia.com/wiki/Cold_Feet]Cold Feet[/url]), but it's okay as long as they have it in their deck.