the 3 items are great for the champion, if you need shield cut, make it 3rd

rabadon isn't as much of a priority as before, for burst champions like , it's recommended to make it 4th item currently, but you can leave it for 5th item if you need something defensive

against AD assassin and  against AP assassin. they can be made regardless of order, depends on how the game is going and how much you need a defensive item.

super important item if your targets build  Magic resistance. if they build it early, or your team has 2 AP champions, it's important to make void staff as 3rd or 4th item. if your team doesn't have 2 or more AP champions and the enemy team didn't build MR, make it as last item.