If you guys want to see how this works, I will be hosting a custom arena tomorrow morning, Saturday, 9/8/2018, at 10:00 AM Pacific time. I normally like to give more notice, but since people are showing interest, I will go ahead and set one up. When you log in, go to the Custom Arenas tab and enter the "Canyon Fight" arena.
As Hitech and Skuzzy both said, the custom arenas are free. You do not have to be a subscriber to join. If you have a friend who wants to try the game out, invite them to join. We can have up to 16 people in the arena.