There is an update coming to this weekends Champions Arena (Sunday, Sept 1) that we wanted to inform you of.
Currently, in Champions Arena, Coins are one of the rewards that players earn from competing within their Champions Arena bracket. For the next Champions Arena, we’re making an update to the number of Coins that are possibly rewarded. Now, the quantity of Coins possible at every rank within a bracket will dynamically increase based on the number of Coin-based entries within that bracket.
One minor note, there is a small visual bug on the info screen if you tap the coin icon on the rewards window.