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 3-2, level up to 6 regardless of your start. Put together the strongest team you can.
Once you have 50 gold, begin slow rolling for units like Warwick, Vi, Zac, Lissandra.
Fiora can be replaced by any Challenger really, but she synergizes well with Vi for Enforcer. Vi should be the unit you look to put in at level 7 assuming you already have Fiora.
Gain 2 Chemtech Emblems.
Chemical Overload III
Chemtechs explode on death, dealing 40% of their maximum Health as magic damage to enemies within 2 hexes.
Gain 2 Challenger Emblems.