Because Woo, it is not that a person's Deck flat out sucks, unless of course someone is doing something crazy and playing all the Grotto cards or something. It is more with the fact that certain Decks have an advantage over other Decks. I am not talking about you having a Gravekeeper Deck and I make a ANTI-Gravekeeper Deck to beat it. Some Decks are good, some Decks are not as good. Some Decks can beat certain Decks, but lose to other types of Decks.