On a player’s turn, they can make a maximum of one attack. This includes all types of attacks, such as Fire Attack and Lightning Attack.

Whenever a player needs to use an Attack, they may use a Lightning Attack as well. 

Using an Lightning Attack as part of another card, like Duel, does not count towards this limit and does not count as the player's attack for that turn.

There is no limit to the number of attacks a player can make outside of their own turn.