I was really excited about playing as an Evoker for the Panda Remix event but I just found out that I can’t create one because of the error “You can’t have more than one Dracthyr in this realm”.
Please increase the restriction to at least 2 per realm so we can play them.
I just deleted mine and created another one with the same nickname.
Profit.
Do Evoker have a trading post shoulder/helm/belt set? And you need to play the class to get it. So if you’re an evoker main you’d need to either delete your active main or leave your server if you want the transmog?
Kind of a strange design choice, but okay.
That’s a solution, but if your main is an Evoker, that’s not the solution.
It’s not an error. This restriction has applied in the past - DK and DH had same restriction. It’ll be lifted in next expansion.
Are you on a realm connected to another one? You’d be able to get around it that way.
I just had to level another character to 50 quickly on another realm and then create another Evoker that way. It sucks that I can’t join my guild, but I can still group and raid with them cross server.
Would have rather been able to just make another Evoker, though. Or better yet, not have to create an alt at all and just be able to do the timewalking stuff on my main. 
Yeah, I think people’s biggest complaint about these events is we can’t do them on current characters. It makes sense the way they structured them, but maybe they can do one where we can next time.
I was just going to make a post about this, too. Leveling a dracthyr from 10 is FUN! Being able to leap right into dragonriding mode (as a level 12!), slamming down on bad guys and fire breathing the heck out of em?! Top tier WoW experience.
We shouldn’t have to jump through hoops to do it in Pandamonium. Lucky me, I have high level characters on other servers already, but I bet there are a lot of people like @Soared. I.e., normal, healthy, well-adjusted gamers who don’t have max level characters on multiple servers. 