The Razer Kishi is a recently-launched smartphone accessory that snaps around a phone to give it physical in-game controls. Its controls include analog mechanical thumbsticks, which might be handy in the course, of, say, using Xbox Game Pass. Conveniently, the Kishi now works with this new cloud-gaming solution for Android.
https://www.notebookcheck.net/Razer-s-Kishi-mobile-device-controller-is-now-compatible-with-Xbox-Game-Pass.484861.0.html