Fast 8 - Proper Sorc ReRoll Early game swap items like Spear of Shojin, Nashor's Tooth, etc. to the highest star backline Sorcerer. Early on, Zyra will deal more damage than Lux, but make sure to also keep some sort of mana item on Lux so her shield will activate often. If you get Starry Night as an Augment, you can ramp this comp up super fast and you're pretty much guaranteed 1st from what I have seen at Plat and below.
Make sure to throw all items on the highest star you have until you get Nami 3. Then it will be 10k plus more damage once she hits 3. I just keep throwing Support items once I hit 8 and have a few Nashor's Tooth and Spear of Shojin on them.
Once it gets late game and you are deep into 8 and feel like pushing it to 9, I will always add a Black Rose unit. Typically the highest star that comes across. More often than not it's Cassiopeia around the time I'm ready, but sometimes you'll get lucky and grab a LeBlanc. Push 9 and 10 if you roll a Viktor or Warwick.
If you can get a Sorcerer Emblem or Black Rose Emblem you can switch a bunch of stuff up and add a 6-cost easier or even another frontline tank.
I got a 24 Win Streak / 100 Health / 1st in Plat discovering this exact build. Enjoy!