What was your favourite Magic deck that you built?

I've made a lot of decks over the years, but I think my all time favourite one is still my Selesnia deck (which was standard until RtR rotated out). I refined it so much, playing with it then tweaking it here and there. I didn't look online, it's all my own creation which makes it more special. And it was 100% themed. It wasn't a tournament winner because of that, but it was so fun to play, biding your time, building an army of centaurs and giant wurms... and then you had to try and take them out in one fell swoop.

What have your favourites been?