For the mechanics, try a combo of Overdriven Voodoo Dolls and Nightmare'd Juggernaut with Gravity Shield. It seems likely to have a turn 1 8 attack creature, Nightmare it on second or third turn (if unupped) and be able to pull off a pretty tough offense while denying opponent's draws and quanta. I don't think it's really OP, but it might just be a very strong deck. Very versatile too, it'd be something that shapes the War metagame quite a bit.
IMHO, there'd probably be very few OP decks with this. This is UP in any situation where you'd play it from the hand normally, and any case where it is involved will probably have is as one of the main strategies (Fractal or Nightmare). If you play this w/Nightmare though, you'd have to take a few turns to set it up, and one PC card takes care of a Gravity shield.
If that becomes a hassle, you could lower HP to 3.
I'd like to here more about the origin of that image or why "inevitable" would work.
Nice unicycle - if you're going to make any changes to the art, keep that part of it.
(half-serious here)
Well, it comes from D&D. Basically, inevitables are the incarnations of unavoidable justice. They come from the plane of Mechanus, which is the Lawful Plane and is composed of giant spinning gears. They are also constructs.
Hmm. Overall, I think that "Juggernaut" makes more sense for this card as a creature, while "Inevitable" sounds more like this as a permanent or spell. ("Juggernaut" makes me think of a large object while "Inevitable" sounds more like a concept that would fit into an Elements weapon similar to Discord and Titan, or a spell like Momentum or Acceleration.)