Nightmare

"Nightmare creeps into people's hearts, sees everything, and controls them at will. He's a devious demon." - Jack Connery.

Being a professional crime planner Nightmare offers his help to other thieves around the world in exchange for half of the stolen treasures.

With his help success of the operation is 100% certain. Unfortunately, thieves who accepted Nightmare's help have to pay even greater price, as every one of them get's killed or arrested on the very night of the crime.

[Spoiler] Later he is revealed to be Jack Connery himself. [/Spoiler]