Each player starts the game with an attack deck of 20 attacks and the game is started with 2 of these attacks in the hand, at the beginning of each player's turn during combat an attack is drawn. The attack cards each have build points which when added up equal 20. This prevents the hogging of good cards. During a player's turn they must play an attack, which sends it to the discard pile. By playing attacks the player decreases the energy of the opponent's creature. This is the key to winning the game.