How to:
You need one thing for this, and it's an addon. It's called oQueue, and can be downloaded from here:
It's not a virus or anything, it's a well-known add-on for WoW. Google it!
1. Complete the daily quest on your server.
2. Download and install oQueue in your AddOns folder.
3. Log in and open oQueue.
4. As a category, set arena, questing or anything that'll get you into a group, not a raid.
5. When you get invited to another server, simply take your cub out again and do the quest again! (the quest can be done and turned in on your server if you'd like, but you need to take the quest whilst x-realmed).
P.s! Do leave a comment!