The Strength of Yasuo in Season 9
As a 4-cost champion, Yasuo is designed to be a carry in the late game for the Ionia composition. Not only does this champion possess strong damage capabilities, but he also provides a bit of crowd control for the team. It can be said that Yasuo is a relatively versatile carry at this point in time.

Moreover, other champions from the Ionia tribe also possess considerable strength relative to their cost. Therefore, players can maintain their health extremely well with this composition while having a substantial economy to invest in Yasuo in the later stages.
Building the Ionia – Yasuo Composition
In the early game, players should prioritize the trio of Irelia – Sett – Warwick as the foundation for the team. These three units will activate the Duelist and Brawler traits, providing significant durability and damage. You should add Jhin in the backline to achieve the 3 Ionia trait early on.

Moving into the mid-game, Taric will be a valuable unit to have as he helps other tanks survive longer. Additionally, Zed will also be a strong unit at this point as he can hold items for Yasuo and deal significant damage.

In the late game, Shen, Yasuo, and Ahri will be the powerful champions to help players complete the 6 Ionia trait. Aatrox is also a unit worth purchasing at this point as he will provide significant damage to the player’s composition.

Regarding the Legendary choice, Caitlyn is the most suitable for the Ionia – Yasuo composition. The Star Guardian core will help players purchase Irelia and Sett at 2 stars early to maintain health. Meanwhile, the free Shop Refreshes on the third core selection will help players find Yasuo and Shen more easily. For items, Yasuo will need Giant Slayer, Bloodthirster, and any damage item.
Conclusion
With impressive strength from early to late game, the Ionia – Yasuo composition is relatively strong at this time. This promises to be an effective ranking strategy for many players at the beginning of season 9.