The Demacia - Tacticians composition proves to be a cost-effective choice, avoiding the need for expensive core units.
As of the current moment, Teamfight Tactics Season 9 has passed the halfway mark, bringing forth intriguing innovations and earning high praise from players. A notable addition is the introduction of the Legendary system - where players can select complementary enhancements based on their preferences. These Legends directly influence the process of choosing Technology Cores, each with its unique advantages and disadvantages.

Naturally, accompanied by strong and efficient formations favored by players, the Tacticians composition, with its special mechanics and evenly distributed strength across all lines throughout the match, stands out as a popular choice currently, ensuring effective rank climbing. When paired with Demacia, it forms a well-rounded offensive and defensive team.
Demacia provides players with suitable Light equipment, serving as a significant power boost for the 1-gold champion - Kayle. Furthermore, the resilience of Galio combined with the control of Jarvan IV assists players in maintaining a sturdy front line. Kayle, in conjunction with powerful champions like Zed, Gwen, or Aatrox, becomes a formidable core in the Tacticians composition.

To optimize this lineup, players need the most suitable equipment as champions like Kayle, Zed, or Katarina are only valued between 1 to 3 gold. Additionally, Legendary champions that can be utilized in this match include Aurelion Sol, Ornn, or Lee Sin, and Ezreal.
In the early stages of the match, players might already possess key forces like Kayle and Zed. If fortunate enough to acquire Gwen early (thanks to a core providing a random 4-cost champion), gamers will ensure a strong lineup from the beginning to the end of the match. This lineup doesn't need overly fast upgrades but requires players to rotate the Shop to secure a 3-star Kayle as early as possible.

As the mid-game approaches, Katarina and Kled will be suitable additions to the lineup. The synergy of Katarina and Gwen's damage, combined with the magic resistance reduction from Kayle's Electric Surge, will ensure the quickest cleanup of the opposing lineup. Additionally, Shen and Sett will be necessary to increase the defensive capabilities of this lineup.

Towards the end of the match, players can perfect the lineup by replacing Garen with Jarvan IV and adding Aatrox and Sion (if equipped with multiple Tactical Crowns). The complete lineup at level 8 includes Kayle - Katarina - Zed - Shen - Gwen - Jarvan IV - Galio - Aatrox. Kled and Sion can be added with Crowns to activate Noxus and 5 Protector bonuses.

Strengths and Weaknesses
This lineup demands optimal items and quick Shop rotations to acquire desired champions. Players must also select the appropriate Technology Cores to avoid having numerous champions without upgrades. Moreover, this is currently a highly contested lineup, so players need contingency plans when suitable champions are unavailable.