I never got into Magic: The Gathering Online (MTG:O), because for me Magic is meant to be played against a live opponent, where you can read your opponents body language, but a role playing computer game, based on random battles with Magic decks, thats something I can get behind, and it was the fore-bearer to MTG:O
See, it started with War of the Spark actually
UW Landstill: I initially felt OK about this matchup since I play Call of the Herd and Roar of the Wurm, which play well against one-for-one removal
You should be happy with the stats you can get with it on turn 4 and later in the game, it is not too difficult to create a 4/4 or even 6/6 Zombie
Ive written a lot about Commander and Magic in general so if you want to explore further, the Star City Games article archives have my articles all the way back to January 2000
Green does have a nice tool