Will I ever be able to 1 hit oblivion monsters?

So, hypothetically, what equipment would be required to 1hko at lvl 200 as a 999 int low luk mage?

(I just think this is interesting, I don't plan on upgrading anything except my shield and my z helm.)

You should at least upgrade your belt. White belts are embarrassing when you could easily get a blue or red...