carved horn pot

Does anyone think this would make a good bonsai pot. its carved horn from India.

As long as there are drainage holes in it, should be fine.

My concern is for the material.  You should be aware that horn, even when coated with resin to seal it, is sensitive to heat, UV damage, and drying.  Like antler (even though it's an entirely different material) it should be oiled and not exposed to direct sunlight.  It will tend to crack, peel, and degrade rapidly outside in full sun and freezing temps.  You may be able to use it indoors but I would use a plastic liner to protect it from excess moisture.  You can find care tips concerning many kinds of horn materials if you want to look up information on knife making, for example.

good point above...
horn is just super compressed hair