Here we go again... So what is considered casual. I think I have a rather specific answer to this, so here it is: Casual magic is based on the mid-game, specifically both(or all) decks getting past the early game intact and with board position. This is one of the major reasons multiplayer is as popular among casual circles as it is, since it's very difficult to dominate the early game, or any part of the game for that matter in multiplayer. Tournament decks are the opposite of this. They are built to dominate the early game, or have complete dominance during the mid-game. Specifically, tournament decks are built to ensure the mid-game never happens, though sometimes it does anyway, and its never intentional. This also separates people like us from the bozos over on the MtgSalvation casual boards playing tournament-lite "casual" decks. They play tournament style decks that simply are different and not good enough to win against real decks. Just because your deck isn't built to win during the early game doesn't mean you have to abandon it. I personally build fast decks, in order to be in a better position when the mid-game rolls around, by having more out or beating on my opponent and his stuff, or both. I think playing in the middle of the game against another deck that's still on its feet is the most fun magic can be. Sure, its wide open and anyone can win, but that's just part of the game. I build my decks to be nasty at that point in the game anyway. Its also more fun for everyone, even a newbie since the game has some length and they get to play, even if they get stomped in the end. The main point is that you don't play a deck that prevents your opponents deck from occuring.