Create an image of a majestic dragon, intricately sculpted from pristine white marble, positioned in a dynamic pose as if rearing up to strike. The setting is a deep black background that enhances the stark contrast of the white marble. The dragon's tail is beginning to explode into a cascade of vibrant blue and green paint, which looks like it's bursting forth with great force. The paint transition should appear fluid and almost gaseous, symbolizing a sudden release from binding limitations into expansive freedom. The focus is on the detailed texture of the marble against the lively, fluid paint in bold bright colours of the rainbow --ar 16:9