Why is the upped version have a lower cost and higher HP?
I believe it's okay as it is, but I think N should be position / 2 making it increase 1 ATK every two positions and a max of 12.
23 ATK is too much in elements, and setting a limit would deter it from reaching the highest position on the board.
And what? Fuel? It's an inanimate rock, why does it need fuel?
Hey, can we make it airborne?