I'm a new player in this game, so sometimes I am confused about game rules. My question is about combining sphere. I read game rules and I know we can can use multiple sphere in the game.However, how can we build decks if 2 players want to choose same sphere? For example, I chose the sphere of sprint and the sphere of lore (glorfindel, eowyn and eleanor) and other player chose the sphere of tactics and the sphere of lore (beravor,denethor and gimli).In this case, how can we build decks? Or Is this possible? Can player use the same sphere in the game?