well even if you have a panda pied, you still at minimum need a pewter het pied to breed to it for a 1/8 chance of hitting it. Chances just decrease from there. a pewter het to a cinny het gives you a 1/32 chance. It possibly could be around the corner but few have the snakes to do it. As far as pitfalls, nothing I would expect besides the super cinny stuff, but anything can happen.