These League Battle decks, based on their decklists as reported by Pokeguardian, look fairly competitive and contain cards worth buying
Essentially, this deck punishes the opponent in different ways
What makes this really quite nutty is that you can get a 2 for 1 as well as a decent tempo swing
Mishras War Machine Mishra's War Machine looks like a very expensive and demanding card for your resources at first glance, but this card it can act like a finisher in your banding deck
This is hugely powerful and flexible, allowing you to remove a powerful opposing character from play or even one of your own, if its running low on Willpower, just as a few examples of how you can use this ability
You then want to be able to dig into your deck and cycle through it a bit more than non-blue decks tend to do