MLB TV does support casting, I believe. But not that this really matters right now. It would be great if these worked, as the only thing holding me back from being a complete cord cutter is watching the Twins. I would gladly pay for MLB TV every season if I could actually watch Twins games, but no go. I know there are options like a VPN or a proxy server, but it getting everything set up sounds like it would be a pain. The MLB had better figure this streaming stuff out soon.