Who never heard of the famous card game? And now you can play it online for free. The site isn't official, but Magic Lovers created a program that you can download at the forum of the site below (the link is going to appear at your left site, under downloads/programs). After it, seek someone in their irc and ... have fun!
Site address: http://www.magic-league.com/
Tottally free, no ads and perfectly safe.
Edit (2017)
You should also try the newest:
http://xmage.de/
More info here:
https://www.reddit.com/r/XMage/
Edit (2017)
You should also try the newest:
http://xmage.de/
More info here:
https://www.reddit.com/r/XMage/
