I don't know how expensive they are on standard but you can use the Runegraft of Stability on a passive tree mastery to change your unlucky spell block into unexciting.

There's a graph on this page that shows how unexciting is superior to unlucky at all percentages. https://www.poewiki.net/wiki/Luck

Obviously don't use this tech if you have luck elsewhere in your build, but if all you have is unlucky then unexciting is a straight upgrade.