Talk:Armorknight Cerberus/@comment-10353581-20131129233423/@comment-213.104.130.29-20131218141040

Your Flag tells you which cards you can use. The Dragon World Flag says you may use  and  cards. The rules say you can include cards from other worlds in your deck, but you cannot play them, so I don't see why you would want to.

Perhaps in the future they will release Flags that will allow you to play cards from multiple worlds.