My local gaming store once ran a "50 card theme deck" tournament where every single card (besides basic land) had to have the same word in it somehow (flavor text included.) There's were no restrictions besides the usual 4-of rule. Keep in mind this occured during Mirage block. Here's what I came up with:
Artifacts 
6 island
6 plains
4 mishra's factory (needed more creatures, didn't think about strip mine though. it may have been better even though the majority went mono-colored)
4 sol ring
4 phyrexian war beast (with 2 sol rings, a first turn drop!)
4 yotian soldier (hate against goblins and the "first strike" red herring decklist I fed to a couple of opponents- it ran 1 toughness pump knights)
4 juggernaut (primary finisher)
4 serrated arrows (GREAT against goblins lol)
4 copy artifact (copies Serrated Arrows without counters on it and comes into play with 3 counters!)
4 enlightened tutor (grabs pretty much anything in my deck)
4 icy manipulator (taps creatures, lands or the following artifact...)
1 winter orb (
, actually, I rarely used it)
1 zuran orb (tutored for against goblins b/c of goblin gernade)
Highlights:A week before the tourney, I gave my acquaintence a decklist of my second choice, a mono-white "first strike" decklist, under the guise to prevent him from wasting his time by competing. I knew he was running goblins and that he'd probably get overconfidant :lol: Turns out he did one better; he showed/playtested the deck I gave him w/my chief rival (who hasn't beaten me once to this day) who screwed himself by making a B/W first strike deck featuring 12 black and 12 white pump knights to hate on me! That idiot got mana screwed all day long LOL! (Trying to play second turn black and white knights with only basic lands? Come on!) Plus, he whined to the judge about my deck being too powerful but as I recieved the judge's approval a week earlier, there was nothing my "rival" could do about it!
The only decks I remember playing against were the aforementioned goblins, B/W first strike, and a minotaur deck. But there were at least 8 players. I never lost a single game
