Rex meta any real counter

This is the kind of team that breaks the rock scissor thing. You can reasonably beat this only with better mods. Even with a droid team which you can easily get faster, you will get wiped by AI unless, again, you got uber mods.

Yeah, lots of peeps have Rex and don't use him. But if you have the best speed mods AND you have Rex, you will probably use him. You can put together a team that defends very well against almost everything else ur shard can put together. It won't be unbeatable. But you will have discoverered the top of the food chain, IMO. Congrats. You won Arena.