- Download the latest .msi file, here
- Execute the following from the terminal:
wine start MTGAInstaller_0.1.3213.823095.msi. - Follow the Setup Wizard prompts. It will look something like this:

- Once installation is complete, go to your Wine path then enter
Wizards of the Coastand runchmod +x MTGA.exe. - And finally launch it via
wine MTGA.exe.