Arena resets will kill you if the battles do not
It is looking like arena resets are the first problem you soon face as you try to battle like crazy to stay in your tier. A reset can drop your score a few hundred points instantly, and it would take miracles to fight back up. You may start near the top of a tier but the reset will put you at the bottom, and once you are there you are just one passive battle away from being dropped to the next lower tier. So going from Gold 4 to Gold 1, and then Silver happens in a jiffy. Nobody can get that good in such short amount of time, unless they just happen to have some big guns that they had not been bothering to use. So I piddle away trying to do the daily 5 battles (daily slaughter), knowing full well it will all be useless at reset. Then I drop into the next tier and rinse and repeat.