Well today i invitet a new player in my 2vs2 Team with an 2156 Rating.
My partner has played with my alz in 2vs2 at 1300. So this invisible Rating is at about 1300 and my inv. rating is about 2100.
So now what you have to do is to play 10 arena games and win them in a row. This is made easier because you're playing against opponents at 1500 rating because of the difference of your invisible ratings.
I hope it's not a repost, i couldn't find anything like this.