Suggested it myself several times. So, yes, +1.

+2

+3

Would probably enjoy arena/PvP a lot more if I could test/meme around with my friends. 

Me too, when worrying about points i am far too risk averse to try different tactics in classic.

I think it would encourage people to be tactical and people would have a laugh whacking their mates teams without point consequences

+4

 Plus, private message to members. At least from clan leader 

Also something I've suggested, so +1 to that as well :)

My clan cluster attacks each other all the time and posts the results in our discord for either bragging rights or so people know what worked/didn't work.  It's encouraged and it's a blast... sadly I almost always lose lol.

Would be fantastic to be able to always do it and not just when you run into them.  I think it'd really encourage clans and cooperation in clans giving them activities they can do to practice arena.

+5 :P