Yeah the game has been dropped by its authors at this point, but there are a lot of cards available (I ended up buying the entire collection of all packs and expansions for $100 on Amazon... though I never pull it all out) and the mobile app works (including multiplayer, simultaneous or not, and bots).
> This app is not available for any of your devices
and the Install button is "grayed out". That explains why https://play.google.com/store/search?q=Epic%20Card%20Game&c=... from my device only came back with sponsored ads and Hearthstone because they have effectively be delisted from Play -- still available if you have the actual link, but not showing up in search results from the device