The Argent Pony Bridle is now working partially and gives access to a vendor selling reagents (below).
However according to the comments at WoWhead and this video, it is supposed to:
I understand that there are more important priorities than this however.WoWhead comment wrote:Let you choose 1 option every 4 hours
- Trader (vendor)
After choosing you have 3 minutes to use that option
I'm not sure if there should be an indication for this item, like the one that exists for mounts and pets, that tells you that you have already purchased this item. I did have a brain fart and forgot that I did lol.
And as a last note, the visual for the Pony is bugged.
PS: Again, I understand that there are more important priorities; just wanted to get this out there.