Let's buff Olaf
With the new Maurader skin coming, we can expect Olaf play to be more common. But, Olaf still has a huge issue:
When you cast R, you get bursted into elo hell. If you die a couple of times, you fall off completly in Ranked. If you build damage, you get bursted. If you build tank, you don't do enough damage and still die because you couldn't kill in enough time.
I'm not saying buff damage, but I propose a small amount of additional Life Steal granted when R is cast. That way, you can still be bursted, but if you do reach your enemy in say a team fight, you can have a little more sustain. Sure you have w, but it's nowhere near enough sustain unlesd you build nice damage(but again, Olaf will get bursted that route..)
Or just a defensive buff of sorts when R is cast. I think the bonus Life steal resonates with his kit, and would help Olaf from becoming useless later on. It can help an Olaf player be able to make a comeback.
On top of that, a buff like that would boost his sales with the new skin, too.