6 Rebels combines an offensive and defensive synergy to beat down the enemy team with high cost units like Aurelion Sol, Gangplank, or Fizz.
Go for this comp if you find early Rebels and have decent items for Jinx. Things like Red Buff or Last Whisper are good examples of this.
Level up on 2 if you are strong and want to start a win streak. Level up to 5 after carousel on 4 if you want to continue your win streak.
If you are lose streaking up to round 7, you can level up to 5 if you don't think you can beat the creeps.
Level up to level 6 if you are on a win streak or level up to 5 if you haven't already. Win or lose, you should normally catch up to level 6 on Round 2. Roll if you're very weak or sitting on a lot of pairs.
If you're commiting to a fast 8 lose streak or high rolling a win streak, you can level up to 7 early at Round 4 after the carousel. You should still have at least 40 gold after leveling and have a good unit to put in. Do not reroll until you hit level 8.
Before the fight on Round 1, level up to 7 and roll down if necessary.
7 After raptors, level to 8 if you haven't already and roll down to complete your team.
Fast 8: At 3 level up to 8 and roll down to try and hit 5 cost units early. You should have at least 30 gold leftover at this point, but if your HP falls too low, you should look to hit level 8 as a last resort.
Early game you mainly just want 3 rebels with any unit. Rumble will be a good item holder for Gangplank and give you Demolitionist early.
At level 6, you just want to have your 6 rebels up and running. At level 7 you can either add in Rumble, a Blaster for Jinx, or an Infiltrator for Zed.
If you want to win streak the early game, you can commit an early Luden's Echo onto Ziggs. Magic damage items will go on Ziggs and later Aurelion Sol, while attack damage items will go on Jinx.
If you find yourself getting close to 3 star Zed, you can instead put in an Infiltrator instead of Ezreal. Units like Ekko or Fizz will work in these situations.
You can use Fizz until you find GP, or if you can't make Guardian Angel, Fizz will likely be better than GP.
Before you find ASol, you can use Master Yi for 6 Rebels, but drop Yi once you find ASol.