Forge is great but sometimes a little variety is good. Magarena has rules enforcement like Forge and has a great AI. Magarena's AI is the best that I've every seen. (And I've heard that it is better than the new Duels of the Planeswalker.) Magarena has a great user interface and looks like a real videogame. Magarena lets you pick your theme from a variety of user created skins.
It is hard to describe Magarena's AI. It feels like there is a little guy in the computer that is purposefully trying to destroy you. The AI will play as hard and as smart as a human. Sometimes the AI will hold back and you may think that it may think that it is a glitch but then the AI will play some uber-powerful card that changes the whole game. Most games will be grueling 20+ turns.
Magarena only has 1-on-1 matches and doesn't have any sort of quest mode. Magarena features high-quality card scans so you can sit back and enjoy the great the great art. While Magic is a great game, it also features some great artwork.
Magarena_1126.exe - Is a small update for Windows users and should be put in the same directory that you unzipped Magarena-1.16b.zip
Link - Magarena Download Site for all future versions
Everybody loves screenshots.
Working on an open source project is hard and thankfully other people step up to the task. I, the original author of Forge, no longer work on Forge and ubeefx, the original author of Magarena, no longer works on that project. Thanks to melvin who continues to work on Magarena and thanks to the Forge coders who have added more cards than I ever thought possible.
Forge Coding Team:Friar Sol