How are people scoring so high on the PVP League Tournament??? I figured up the numbers and the person in the lead right now would have had to battle 21 times EVERY hour since the tournament began! Are some guys using bots or something?

Sadly YES. I name them automatized battle bots. These bots fight every 2 minutes even without any interactions from the players. They use them to win the best cards and after at least 3 Months they selling their accounts to noobs who are willing to pay big bucks for their accounts.