This comp focuses on rerolling for 2-cost units and revolves around Soraka as the main carry and Irelia as the main tank of the comp. Rakan is also there to provide more utiltiy while the other units are more 2-cost units or other units that provide synergy.
Go for this comp if you have good Soraka items and a good amount of copies of Soraka or Irelia.
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.
Once you are at 50 gold again, begin slow rolling for 3 star units.
Once you have enough 3 star units, look to hit level 7 and complete your team comp.
Build around your Soraka early so that you don't have to worry too much about transitioning. You can also build around Skirmishers and Sentinels as well.
By this point, you should be able to put the main team together. Continue using early game units if you're still missing a unit.
The main comp for this comp revolves around 6 units, so you can add whatever you want once you reach level 7. This can be a synergistic unit like Diana for Assassin, or just a strong frontline unit like Galio or Rell.