Day[9] & Magic: the Gathering

I haven't yet seen a specific area for Magic: the Gathering discussion. I'm a big fan of the game, and I gather Day[9] is as well. In lieu of a dedicated group, let's dive into some planeswalking discussion. What are your favorite formats? Do you have a particular deck or style you enjoy? Are you a Johnny, a Timmy, a Spike, or some combination? What's your favorite or least favorite card?