A commander can be sent into battle once a day without any cost. After that, each time a commander is sent into battle on the same day, a Stimulant needs to be used. Each Stimulant cost is larger per battle, and the maximum price is 225k credits for the fourth stimulant used that day.
Recently we have decided to give 3 Stimulants for free to everyone upon login each day. This way, the first 3 Stimulants are free of charge for all of you and the fourth one is 225k credits.
Thank you for your understanding,
Player Support Team
PS: A micropatch was implemented today.