We're really excited to see how this plays out as well! This is the first time we've run a factionalized event like this on Arena, and we'll be watching carefully to see how this plays out. We've also built ourselves some safety levers we can pull if too much choice here ends up making things feel stale, like rotating which clans are available or swapping to a non-seeded event.

All the different events go to the same matchmaking queue, and there are no lockouts or protections to prevent mirrors. So it will matchmake like any other sealed (mostly on your record), and your choice of clan won't affect what opposing clans you see