No best of 3, this makes the top decks even harder to face if you dont play one of them since you cant side in countermeasures from your side deck. Locks and First Turn Kill decks thrive on that too. Otherwise almost no complaints except lots of cards that are much higher rarity than they deserve, making it hard to just make casual decks when even the bare essentials for just about everything is high rarity. At first you can only build maybe 1-3 decks. Takes a month to grind a new one.