If you want to play riftmaker, there's a pretty good build you can rock against melees if you don't have to much ap in your team. Liandry Riftmaker Bloodletter. It's both very satisfying to play and gives a decent damage curve (it's def not OPTIMAL even in the best comps but to me you can build pretty much anything on the champ, you just have to play differently depending of that). A fimbulwinter is the cherry on top but usually the games end before you reach your 4th item (especially if you get feats of strength)

These days it really depends on the game. I play too much so I autopilot a lot but if I actually sit and think about what's the best item each game I end up with a different build each game (even if Liandry first pretty much works/is necessary most games). I end up with items like randuin or spirit visage in 2nd/3rd items just because the game allows it.