Select a faction that suits your play style. Mages have more skills that manipulate elements. Rogues are focused on moving cards around the board. Warriors have more cards that deal direct damage to their opponents. To change factions after you have made your initial choice, you must spend 15 Diamonds, which is the game's premium currency. All starting cards can be used by any faction. However, if you use cards from your own faction, they will have -2 Risk. It is usually better to build a deck mostly from your own faction, and only go outside them if you require skills from other cards.