True Damage Yasuo
If you get offered Yasuo (specifically True Damage) as your headliner in stage 2 this comp is very strong. A lot of people use Yasuo as an item holder but he can excel as a re-roll comp. Personally I think Edge of Night is mandatory as your Yasuo can get targeted after casting.
Edgelord Riven
Ideally you want to duo carry Riven andf Yone. But Riven can secure you top 4s on her own.
8-Bit Corki
Great option if you see a lot of corkis early on in the game, you want to stack 8-bit as much as possible in the
Jazz Bard
If you get "That's Jazz Baby" you should default to this comp. However, it can be very strong on its own if you get a chosen bard early in the game, as this allows you to start stacking his Headliner ability sooner.
Headliner Effect: The finale of Bard's first cast each combat spreads an additional Doot for every 8 times he's cast this game. Doots deal 95/140/215 (Ability power) magic damage.
Crowd Diver Katarina
This comp is flying under the rader at the moment since the patch, its still really playable and can secure you top 4s.