This lineup is exceptionally suitable for players who favor the reroll strategy in Teamfight Tactics.
For those unaware, on the Chinese server of Teamfight Tactics, especially at high ranks, the reroll strategy always dominates regardless of how the meta shifts. The reason is that top players here recognize that if you can't survive the mid-game phase, even if you complete at level 8, you're still very likely to be defeated. Hence, players here frequently discover new and innovative reroll strategies, and the latest addition is the Celestial lineup with Gangplank and Lucian.

To start with this lineup, there are typically two approaches. Firstly, you can use the Rebels to accumulate losses to quickly acquire a 3-star Gangplank. Alternatively, if you can't start with the Rebels, the Cybernetics with strong early-game carries are also a good option to set up for introducing Lucian and the Celestial trait in the mid-game phase. If you have an SMCK item at this point, prioritize giving it to Nocturne.

In the mid-game phase, it's crucial to level up to 7 as early as possible to have the highest chance of finding 3-cost champions. Then, players will employ a slow-roll strategy to upgrade Lucian and Gangplank to 3 stars as quickly as possible. If you're too low on health due to playing Rebels early on, you can spend money early to upgrade these two key 3-cost champions to 3 stars. Senna is also a unit worth having at this point as she provides the Idol effect, which is extremely useful.

During the rolling process at level 7, it's advisable to pay attention and buy Alistar as soon as possible because he will serve as both a tank and a crowd control unit against the key champions of this lineup. In case you're lucky enough to upgrade Alistar to 2 stars right from level 7, you can go all-in with your gold at this point to upgrade your lineup. If not, then leveling up to 8 and adding Jinx (even if it's just a 1-star) to the board to reach the 4 Celestial threshold is a much safer play.

For this lineup, the best technology core is Luden's Echo, as Celestial units can easily activate it, adding a significant amount of damage. Gemstone Assurance is also a good choice if you have a 3-star Lucian and multiple skill damage items. Another excellent option is the Duet with the Idol. The advice is not to take supportive cores for the Celestial trait because it increases attack power while Lucian, Gangplank rely on skill casting.
In terms of 'disruption' equipment, Infinity Edge, Bloodthirster, and Runaan's Hurricane are the best items for Gangplank. For Lucian, Blue Buff, Hextech Gunblade, and a magic damage item are good options to combine. Meanwhile, Alistar should still be equipped with basic resilience items like Warmog's Armor, Thornmail... If possible, items like Dragon's Claw, Power Gauntlet will be quite suitable for Senna.
