This is just another coiners game. Since I am SO freakin limited on energy. I pass some time doing duels in the arena since it costs no energy. It is the most unbalanced thing I have ever seen, even worse than World of Warcraft PvP. Dev really needs to match decks with decks, or another way. I have fought level 5 people with cards you can only get by buying or spending real money. Just another typical greedy developer.