This comp uses the 6 Redeemed trait to power up all of your units. Once Redeemed units die, your remaining Redeemed units will become stronger, gaining bonus stats. Vel'Koz is the main damage carry of the comp, while Lux can be a strong mid game carry or a secondary carry to place items on.
Go for this comp if you have a good start with Redeemed units and have strong Ability Power items.
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 down to stabilize your comp if you are weak. Afterward, save up to hit level 8 and complete your comp.
This is an ideal start for a Redeemed comp. 3 Redeemed provide a strong start, and you can fill the 4th spot with something like a Ranger, Knight, Legionnaire, or another Redeemed.
Varus is a strong unit to hold items for Vel'Koz, so you can build around him with supporting synergies. Once you find 6 Redeemed, you can look to transition by selling your early game units.
Playing Redeemed units when you find them is simple enough, but make sure to look for other ways to make your team strong with other synergies like Ranger, Mystic, Knight, Legionnaire, etc. Focusing only on Redeemed units can lead to your downfall if you don't find your upgrades.