Replaces blocks matching the palette with palette blocks shifted along by the given amount.
For example, a shift value of 2 will replace any instances of the first palette block with the third.
Palette: Specifies the block pattern for the gradient.
Radius (Default: 8): Sets the radius of the brush.
Shift (Default: 1): The amount by which to shift blocks within palette
Tip: Right-clicking and left-clicking shift into opposite "directions".