KorakiSaros
Villager
That looks a lot like the Japanese demon horse which Pokemon's Ponyta is based on![]()
Edit: Heh, actually the D&D Nightmare pre-dates the Magic one. It's likely the Magic one is inspired by D&D, rather than the other way around.
Also, it is the title of Piers Anthony Xanth book from 1983. Those books are all about the puns, so maybe it's just a play on words that occurred to two people at the same time.