Hey there rabbit, welcome to RTA... we are a small academy so I'm not sure if there is much to expect. I try to host some events every now and then while our head, Obsidian does post information about the meta or current top decks for discussion so feel free to join in. Rabbits can't be underestimated for sure, i would like to see how your builds work some time. we are getting new members still but sadly not much of them choose to be active...
Regarding testing, us testers don't know the current testing format as of yet so you can direct your request towards (PM-ing) Obsidian... hope you keep active, issues out some challenges and enjoy your stay.