This comp revolves around 3 starring Riven and possibly Nidalee as the main carries of the team comp. The rest of the units provide utility and synergies to buff up your main carries.
Go for this comp if you have good Riven or Nidalee items. Having a good amount of copies will also help 3 starring them.
Level up to 4 early if you want to start a win streak. Level up to 5 to try and continue the streak.
If you're weak in the early game, you can opt to save gold and lose streak instead.
At Round 2, level up to 6 regardless of your start. Put together the strongest team you can.
At Round 1, level up to 7. Roll a bit to stabilize your comp if you are weak.
At this point, you can choose to slow roll for a 3-star upgrade, or level up to 8 for a consistent power upgrade. You can also look for your 3 star units at level 8, but it will be expensive.
Use just about any early game units you find, just make sure to balance frontline and backline. Dawnbringers and Legionnaire also make for an easy transition.
By the mid game, you want to have some copies of your 3-cost units to build around. This also allows you to put your items on early without needing a transition unit.
If you happen to find more Nidalee's, you can always choose to prioritize Nidalee items first. Riven is the ideal carry for this comp, but Nidalee will also do very well at 3 stars.