^what is emperor?
I never liked multiplayer much actually... too chaotic for me. What fascinated me was building and streamlining decks for one on one matches, and perfectly adapting to the small "metagame" of my friends and I. Looking at wining tournament decklists is fun, but not always the most effective when playing against friends.
What kind of strategies did you find most effective in multiplayer? Would you normally just do 4 or 5 person free for all?
Did you use "attack limits" where you could only attack left or right to avoid ganging up? That is something one of my friends liked to do, I thought it was a bit artificial but no big deal.
As far as strategies in general for free for all multiplayer, I found it was most effective to have a deck that could set up some kind of system to control the board in a very general, yet selective way. My most successful multiplayer deck was an white/green Astral Slide deck that focused on setting up an Astral Slide (with Sterling Grove for protection), and then abusing it with cards like Spike Weaver to control attacking and another card whose name I can't recall, but it was something like 1GG, 2/1, whenever it comes into play, return a card from your graveyard to your hand.
It could get a little hairy in the first few turns if someone was playing a particularly aggressive deck and gunning for me, but if I survived 4 or 5 turns I was essentially untouchable and had all the time to finish the game off with an Eternal Dragon or something else ridiculous. I'd be more than willing to PM you the decklist (if I still have it) if you're interested.
My playgroup generally didn't have attacking restrictions, but in hindsight we probably should have experimented with different rules more than we did. After three or four years of the same things every Friday we all just kind of got sick of it and stopped playing.