There's a new battle pass for Teamfight Tactics Set 12 and the rewards are better than previous passes.
what to do after completing TFT BATTLE PASS | MortClips
The Magic n' Mayhem Battle Pass has paid and free to play options. I usually play the free to play versions, but the rewards for Set 12 are a serious upgrade, such as the new Enchanted Archives Arena. This article will break down what you get for free and what is included in the paid Battle Pass version so you can decide which option is best for you.
The biggest change to the Set 12 Battle Pass is the addition of the Enchanted Archives Arena, one of the nicest Arenas the game devs have ever created that you can earn with a Battle Pass. Other rewards included Realm Crystals, Treasure Tokens, Booms, Shards, and four Little Legends.
The TFT Set 12 battle pass goes live on July 31st with the launch of Magic n' Mayhem via Patch 14.15, but only on PC. Mobile players will have to wait another 24 hours for the update to go live. Like Set 11, there are two battle passes for Set 12, with the second due out sometime in September.