Suggestions for some custom spells for a new naga hero?

I am looking for some good balanced custom spells, roughly 3 of them and perhaps an ultimate that would suit a naga type hero. Any suggestions?

can you plz be a bit more specific? like is it an Agility, Intelligence or Strength based? And also does it have a ranged or close combat attack? and is it a warrior, spell caster or anti-spell caster, hit and run?

u dont need to do all of the above, just some more info would help.