Every week there would be a troop selected by supercell, they would have their price and training time reduced by 50%. So every week a different troop, some troops could be excluded if they are considered too OP but the principle is simple. You give players a week of faster and cheaper troop training to maybe use troops they would otherwise never use and maybe they'll love it and after the week they might keep using them. This would lead to more versatile gameplay.
