Shadow of the (mini) Colossus

I have always wanted a colossus mob in minecraft, from the game Shadow of the Colossus. Just imagine: As your pickaxe breaks the surface you realize that you are lost. You must seek higher ground to survey this new land - luckily, in the distant fog you see the ghosted outline of a mountainous formation. Surely it will provide a useful vantage poi...wait, did it just move?!? "OH POOP!" you exclaim, as the form of earth and stone comes lumbering towards you. (something like this)

Anyway, since i have no idea how that could even be realized in game, I wanted to challenge myself to make a mini-colossus. Taking something so huge and boiling it down to something so tiny was interesting, and i'm noooot quite sure i've got it where i want it yet. BUT, here's a look at the 1st Colossus: Valus the Minotaur.