It's one of the Christmas horses. Here's the wiki page for it. https://empireminecraft.com/wiki/dancer/ (writing it out so people can remember the link) According to the promo price thread, it is worth about 65k, but it hasn't been sold in a while, so the worth might have gone up. It is worth more when it has never been spawned, but it is clearly a used egg, as otherwise you wouldn't know it could jump over the guy's house.
the best way to tell if the egg is used or unused is the Unused egg is shiny with the enchantment effect
