Overwatch 2 was the first, but we're getting more Blizzard games coming to Steam. The next one is Diablo IV and it'll be available on October 17th.
I played a great deal of Diablo IV up until a few weeks after Season 1 started. I think the game was a ton of fun early on, but the lack of good end game content and the loot system has pushed me away from the game. The 1.1.0 patch that nerfed everything was the real killer and I lost a lot of interest after that, especially when a few other high profile games came out.
I still think there's a good game to be had here and I'm sure I'll jump back it at some point. Elliot really enjoyed it and I thought the last Act was fantastic, especially the cut scenes.
But, if you haven't jumped in and would like it on Steam for things such as easier Steam Deck integration, it'll be out in a little under two weeks.