Cockatrice is a downloadable application for playing MTG online for free.
If you do not have it yet you may want to get it.
Download link: http://www.woogerworks.com/index.php/client-downloads
Server information is on the main page of the above linked site
My Cockatrice user name is Gracco
PS: If you are interested in a way to play regularly scheduled tournaments on cockatrice hmu for more info. I am not gonna risk advertising by linking the site for events here at this time. If I get permission to post it here I will edit this. They have a event where first place gets $25 every other Sunday.
PPS: I can haz permission to link above mentioned site here? Also pin this in this section when appropriate pl0x. Also after i post the link if I get permission someone else please take control of this OP.
Cockatrice user names:
(Format: Forum name - Cockatrice name)
Gracco - Gracco