New Reward: Unlock Tutorial / Practice Mode (with Unlimited Source)

I love the practice mode ideas put forth in OP. I would find acceptable and fun simply a practice with what you have deal, such as being able to challenge guildmates and defense teams they've set up.

And yes, please make it for no rewards. It would be an actual pure fun part of the game, or if there's any benefit, it would be due to strategizing how to use it for TW