Excuse me what the f? That is a hammer, not staff
With sphinx being reprinted twice already (maximum 3 hammer) and 2 nandi hammer, that's a free null hammer grid right there
Also, if you are short of a sphinx hammer, heryshaf hammer can be a substitute
There are better null for light, sure. But most of them require overfarm/gacha weap, so getting a null grid just from free advent weap? Yes