Even in your example, there is a flaw. A red tiger is still a tiger that is red. Using your own example, look at all of the other colors for the tiger. Each and every one of them is a tiger. Tiger is a pattern, not a color. Using the actual species of animal for this exact example, changing the color of the tiger would keep the stripes black while the remaining fur would be a different color.
No matter what you do, a shape will forever remain a shape. It will never become a color. The same goes for patterns.
I went ahead and copied the definitions of "pattern" from the dictionary:
1 a decorative design, as for wallpaper, china, or textile fabrics, etc.
2 decoration or ornament having such a design.
3 a natural or chance marking, configuration, or design:
And here is the definition of color:
1 the quality of an object or substance with respect to light reflected by the object, usually determined visually by measurement of hue, saturation, and brightness of the reflected light; saturation or chroma; hue.
A pattern is a design, which is objects or shapes arranged in a certain manner, whereas color is the visual hue.
A rewording would be incredibly simple:
"Do you want to try a potion and get a random color/pattern mutation for this price?"
All it takes is adding that patterns can also be affected. Use the dash, use "or", or any other way to show that the pattern is also likely to be affected. Literally anything works as long as color is not the only word used.
It's already a long, long process to get a deviant. The wording of that building is significant to people like myself who can be severaly cheated by the game. I can't be the first and only one this has happened to, though I seem to be the only one mad enough to speak out about it. Maybe the other people who have been cheated left the game after all of their effort was thrown into the void.