Video Guide
This is a Gnar Senna reroll comp guide. This is a standard 2-cost reroll comp that plays around the in-built synergies that exist within the 6 units above.
Early Game
Snipers and Wardens are good units to play around early since we're using them late game. Ideally, don't put items on Caitlyn since we need her later, same with Jax.
3-2 Rolldown
At 3-2, rolldown for the full board. Ideally you hit Gnar 2, Senna 2, and Aatrox 2 and move items to them. This board is extemely strong mid game, and will likely win streak you through stage 3.
Late Game
4-1 is the earliest that you likely will be able to rolldown for your 3 star units, but any time you get to 7+ copies, you should be looking to roll for 3 stars. If you don't hit 7+ copies, you can sit at 50 gold, unless you start to get really low HP. If you hit one of the units 3 starred but don't have more than 4 copies of the other units, you can consider skipping those units and pushing levels. The final board either plays around vertical Warden or vertical Dryad. In my opinion, Warden is stronger.
Final Board
Strong Augments
Inkshadow items are mostly straightfoward (Tank ones on Gnar/Aatrox, damage ones on Senna/Gnar). To see a full list of them, you can check out my Inkshadow guide: https://www.tacter.com/tft/guides/set-11-inkshadow-guide-2de7103f