Blizzard is abandoning DirectX9 so what should I buy ...

[Theroxis]

Originally Posted by kaimox As the title says, I need a new graphics card. I was still happy with my rather old card on my rather old machine and I can't spend a lot of money. Since I'm under Linux/wine and I will not download anything from proprietary websites I prefer AMD. Does anybody have recommendations?

NEVER FEAR!
DXVK IS HERE!

No really though, look into installing a recent Wine-staging release for your Linux distribution and installing Vulkan support for your GPU. Many older GPUs have vulkan support through the Linux binaries, and with DXVK and WINE you can run the DX11 WOW client without issues. See this video, for example:
https://www.youtube.com/watch?v=MlaoLWv72w8