Spiderman said:
If you've been playing it "occasionally", then that shouldn't matter, should it?
And like all "casual" games, you can always play unsanctioned and the way you're used to. It's only if you want to play it in a tourney when you have to worry about it.
Why wouldn't it matter if I only play it occasionally? I'd still like to be able to go back to it anytime I feel like it and can find three other like-minded people.
The thing about casual games being unsanctioned is perfectly true, but I've found that it doesn't always work out very well in practice. Back when the old mulligan was changed to the Paris mulligan, I didn't really understand how to use a Paris mulligan (there's skill involved in it, even if a lot of players, especially tournament players, don't even think about it now). I didn't see the reasoning behind it. Now that I've learned how to Paris mulligan effectively, I like it better than the old mulligan. But back when the change was made, a lot of players at my local cardshop felt the same way I did, and we just played with the old mulligan in casual games. Nowadays, if I were to play casually with some people and tried to use the old mulligan, they'd probably look at me funny. But since it's casual, they might even let me use it. If someone tried to use it in a game with me without asking beforehand, I don't know that I'd let it go. It's become accepted in the casual environment (or so it seems to me anyway) that the Paris mulligan is the only mulligan. New players don't even know about the old mulligan, more often than not.
The mulligan thing went pretty smoothly I guess. A bigger thing for me was when the 6th edition rules changed it so that you lose immediately if you have zero life (not worded that way, but whatever). I was very much used to a lot of things from the old rules, and staying alive until the end of a phase was something that I really didn't want to let go of (in a lot of games it can mean the difference between winning and losing). This sparked some minor arguments with my opponents until I stopped bothering and just went with the rules change. It was an official change, after all. Now, if there were other people that I played against who wanted to go back and use the old mulligan, or 5th edition rules or whatever, we could do that easily. But most people, like myself don't care enough. These days I wouldn't really be interested too much in such a playgroup, since I'm used to the new ways by now.
I don't play multiplayer variants of Magic all that much. If two-headed giant sanctioned is vastly different from the way I played it before, over time casual players will be more comfortable with the new version. It certainly won't be worth it for me to try to convince people to use the old rules for two-headed giant. And I don't think I'd care much for the new ones, although I might give them a try. I'd probably just give the variant altogether. Oh well.
Edit: Looking at the FAQ, it appears that I will indeed not be playing two-headed giant anymore. I find the shared turn thing unappealing. Everything else looks good, but that shared turn thing is a huge turnoff for me. I'm not 100% sure about this though. The shared turn thing could be really fun if I just give it a try...