First, what are you calling a morph? If you are talking about an entirely new gene, you would need someone to calculated the rate of mutation and take into account all the variables associated with it, which is damn near impossible at this point. However I can assure you that a mutation that causes a visible change that doesn't alter the survivability of the animal is extremely rare. I don't think one has knowingly happened in a private collection.
If you are just calling a morph a never seen combination of morphs.... thats easy, take two morphs that haven't been seen together and breed them, congrats on your new combo.
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