The existence of a card game in Teyvat is nothing new to Genshin Impact fans. Characters such as Arataki Itto, Cyno and Kamisato Ayato were known for being huge fans of said game since their debut, and that silly habit soon grew to become a fully fleshed-out game mode for the main game.
This is not the endgame we wished for, but it may be the one we needed. The mode is finally being introduced in 3.3 as a permanent addition to the game complete with its own systems, rewards, and more. You can also play with other players, even though Hoyoverse isn’t offering any real incentive for it.