This suggestion is the result of troop-training related boredom, and not necessarily a desire to hone attack techniques. As the title implies, this new feature would allow you to practice attacks against your own base with troops that you do not need to train. You would be limited to the actual type and number of troops you have unlocked, but not by time or money. This feature would not only allow players to learn better offensive and defensive strategies, but also serve as an interim for when you are not doing anything else in-app. I personally quit and play Castle Story or one of several third-party apps while I am waiting, but it would be nice if we could stay in the realm of Kingdom Clash with something besides chatting to entertain us.