If you look at the record of Minka, who's #1 in the Kha'Zix mastery ranking

It's pretty fun

When he ran Electrocute Kha'Zix, he kept losing

But once he switched to Dark Harvest, he suddenly shot up.

So I queued up Dark Harvest Kha'Zix right away

and it's f***ing busted. A Kha'Zix with a guaranteed late game? Feels amazing.