At the beginning of each hero has only one attack, but the heroes evolve over time. This helps to learn the game, since the tactical depth increases with the number of attacks. The selected opponents are always of the same level so it will never unfair.
Free to Play - with in-game purchases:
The game is F2P, but includes in-game purchases. These are MMN but not necessary to move forward. Every half an hour to load a reward (up to 5) and per duel obtained a. If there are no rewards can be charged to still play. Just gets no reward. However you collect XP. When enough XP, the rewards and fill up again. So you also get free enough on offer!