I'm a green mage at heart, but I love playing blue and white as well. Green/Black or "Rock" style decks are some of my favorites though. Also, I'm big into artifacts. Affinity is one of my favorite decks and one of my most successful as well.
Special cards? Um, I've way too many to really list. Been collecting since '96. I will say however that five of my favorite cards ever (so far) are: Sylvan Library, Necropotence, Skullclamp, Brass Man, and Strip Mine.
My most glorious victory...is a toss up. Sort of. One was an actual victory, the other was a long, long drawn out path to a few concessions and an eventual defeat on my part. The win came in a multiplayer game of 10 players. Everyone was playing an assortment of aggro and control decks. I had a new, mono-black Necropotence deck I had just designed. Long story short, I won by turn 4. I had eliminated most of my opponents by attacking, on turn 2, with 20 8/2 zombies (and being at around 30 or so life myself). I finished off the other 3 players over the subsequent turns by attacking with the remaining zombies, of whom were 2/2s by that point.
The other, not so victorious game, had a similar game set. There were 14 players in a massive multiplayer game. I was playing a green/blue/white control/lockdown deck. The game started out with 7 teams of 2 players each. Three hours after we started it was down to 2 teams. Me versus 11 other players (3 conceded). Yeah, my own teammate turned on me. Even against those odds, I still managed to survive their onslaught for another hour and a half before they finally managed to finish me off. It was intense. Naturally, I have been strictly forbidden to play ANY deck even remotely resembling that monstrosity at any of our play sessions.