Pictures would help.
If it's pre-gunpowder and would fit in a medieval, medieval fantasy, or earlier time period, than sure. It'll still have to be safe to fight in in order to be allowed on the field.
- can you feel your hits?
- what are the horns made of and are they dangerous?
- can you see well enough to fight safely?
- how well can it hold up to the rigors of fighting?
I haven't seen anyone do anything like this. You won't be able to fight well in what I'm picturing, but if done really well it could be cool.