I restrict myself to playing type I legal decks, although some of my friends use any 60 cards, no more than 4 of a given card as their guideline. Oh, and while we're on the subject : What rules do you guys like to use for multiplayer games? I usually play a free for all game with house rules on a two player range for spell effects and attacking. (Ex. My Wrath of God affects me and the two players to my right and left, but stops there.) The neatest rule is you can Misdirection the guy's spell to anyone you can target, thus extending someone's range.