I realize that the art doesn't match alexwarlorn's description of Nightmare Manacle, but, like the others, I'm using Giuliabeck's artwork for all of them.
Note that this isn't actually a part of the Set that I'm working on for MLPFiM, but rather from my "Just For Fun" Set (hence the different Set Symbol).
MLPFiM created by Lauren Faust
Magic: the Gathering owned by Wizards of the Coast, which is owned by Hasbro, which owns My Little Pony.
Art by Giuliabeck
Nightmare Manacle created by alexwarlorn.