Worlds are over and Kai Budde has emerged victorious with a beautiful version of the mono-brown Wildfire deck. Maybe everybody's already seen it and I just haven't looked before, but I love this deck. Here's a list if you want one (I'm not sure if this is right, but it's close, the Sideboard has the actual one):

4 Wildfire
4 Cursed Scroll
4 Covetous Dragon
4 Temporal Aperture
3 Masticore
2 Mishra's Helix
1 Karn Silver Golem

4 Grim Monolith
4 Fire Diamond
4 Thran Dynamo
2 Worn Powerstone

3 Ancient Tomb
4 City of Traitors
17 Mountain

With the errata on Waylay taking effect a few days previous to the tournament, there was no clearly dominant deck. I think I heard the Death was the most popular, but it could have been Magpie. Hatred, WW, Green Blitz, Ponza, Combo, Control Black, Oath of Druids, and Brown Wildfire were all there in various numbers as well I'm going to take a brief look at some of those -- what they do and what they're strengths and weaknesses are.

Living Death

Death is an undeniably interesting deck due to its flexibility in design. I'm really not experienced enough with it to know a great deal, but I like the basic design of the deck Seldon took to the top 8 at US Nationals. It focuses on Avalanche Riders and Yavimaya Grangers, while Oath of Ghouls provides a very powerful (and cheaper) alternative to Living Death itself. From what I've seen, the power of death is really limited only to the player using it. It has the means to shut down all but the fastest blitz decks (has a slight problem with Hatred). With enough well placed Avalanche Riders, Yavimaya Grangers, and Oaths of Ghouls it can handle most control decks as well. As always, the real key to the deck is Survival of the Fittest. I don't see any decks other than Magpie and possibly Ponza giving it problems.

Magpie

This is another deck that is only as powerful as its player. It's basically a remake of Forbidian. With Masticore in place of Disks, Powder Keg in place of Legacy's Allure, Magpie in place of Ophidian, and with Treachery providing a somewhat frightening dimension to the deck. It is only really threatened by Control Black (discard) and green blitz (River Boa and a gazillion creatures).

Black Control

I believe the version with Corpse Dance was quite popular at Worlds, and it took a few players to the top. Discard is the key here, while Phyrexian Negator provides serious beatdown. It's drawback isn't that much of a drawback if you kill all of your opponents creatures. This is a deck I don't know a great deal about, but the Sideboard has Jakub Slemr's and a few others' decklists. It is a good answer to Magpie, and to blitz decks like WW and Green. However, with enough well placed discard, you can take out most anything.

Ponza

It seems like three weeks ago, everybody thought that this was the worst deck you could possibly play, and now whole truckload of people are playing

it. I think that the aversion to Ponza might have been due to the prevalence of Waylay-WW and, thus, Soltari Priest. Ponza tends to act like a combo deck. It will try and destroy a land a turn, until you stop playing them, and then lay down a threat. If it draws the land to perform in this fashion then it basically ignores your deck aside from its lands. Its favored matches are control black and Living Death.

Monobrown-Wildfire

Like I said, I think this deck is just beautiful, but that's only because I love a good synergy. I don't, in fact, think it is uncommonly strong. Obviously, this deck relies on artifacts to produce more mana than you can count and then establish control with a Wildfire, Cursed Scrolls, or Masticore. If you can take out the artifacts before they become too dangerous, you should be able to win. Viashino Heretic/Shatterstorm anyone? One thing to note is that there are no answers to enchantments and only one to artifacts (Karn + critter destruction). Red never has answers to enchantments, but this deck might actually care, since it is less aggressive than most red decks. Wildfire can, however, alleviate the effect of some enchantments and artifacts to a degree. With 11 Strong answers to creatures (plus Apertures to help fetch them), this deck really knocks around blitz types. With a snickering attitude towards land destruction it can also take down Ponza with nary a word. And, oh yeah, I hear Masticore is pretty scary with fourteen mana behind it.

The Green Machine

Green has just been fed so much good stuff that it seems like Jamie Wakefield has secured his own agenda in R&D. :) Sixth brought back River Boa, Creeping Mold, and those infamous fornicating apes to name a few. It already has Spike Weaver and Feeder to keep it alive for who knows how long, Llanowar Elves, Priest of Titania, Eladamri's Vineyard, and Rofellos to provide a scary mana curve, Might of Oaks, overrun, Pouncing Jaguar and Wild Dogs, Thorn Elemental, Verdant Force, Child of Gaea, Weatherseed Treefolk, and Multani to kill your opponent in more ways than I can count, and, oh yeah, I hear Masticore is pretty scary with fourteen mana behind it.

The green weenie version was the one that took several players to the top eight, though I personally prefer fatties. Either way, it's beatdown plain and simple. Just kill your opponent and be quick about it. I think Ponza is very evenly matched with the weenie version. Blue cringes at the sight of a River Boa, Death chuckles and Survivals for a Bone Shredder, control black sacrifices a Ravenous Rats to a Plaguelord then attacks for too much with a Negator, and Brown-Wildfire plays another artifact mana source and eats two while it waits to kill you with a Covetous Dragon. However, those decks had better draw the cards they need, because the green machine isn't very patient when there's a living opponent on the other side of the table.

Combo

There were several version of Bargain, Replenish, and Replenish/Bargain appearing at Worlds. With a little luck, these decks can soar past the first game, but after sideboarding I don't see how they can stand much of a chance, with the odds so much against them. Looking at the rest of the field, this is a deck I simply wouldn't choose to play. Of the decks listed above, the only one I think Combo consistently beats is Brown-Wildfire, with a reasonably even match vs. green.

Hatred

Personally, I loathe the actual card Hatred. I see a lot more turn two Parches, Shocks, Kindles, Miscalculations, Counterspells, Mana Leaks, and

Diabolic Edicts than turn two Hatred kills. I do however like Black Blitz. The deck is probably the most aggressive one on the field. While there are cards that can shut it down (Powder Keg, Masticore, Fireslinger, etc.), by the time they are out and functioning, your opponent may be unable to recover. Phyrexian Negator is just a beast in this deck. I didn't like it at first, but after playing with it a few times, I love it. The drawback isn't that bad, honestly, you just have to know when not to play it. Twisted Experiment is a good choice. It makes those Sarcomancy tokens, Carnophages, Negators, and Dauthi Slayers quite large, and it doubles as small creature elimination. A few Duresses make for some good disruption to help hit some of those problem cards like Powder Keg. I'm still trying to make Contamination work, but that's just one of my things. A little red splash might be a good idea, if only for some artifact destruction. Black Blitz is pretty strong vs. Green, and Magpie, and has a similar timer on other decks to that of Green. This is why so many people play beatdown. Your opponent must hope to draw their answers, while your deck is unflinchingly consistent in its plays.

Deck to beat: Magpie, Control Black, and Green Blitz Card to beat: tough one. I'm gonna say Phyrexian Negator. Deck to watch out for: Black Blitz Weakest Mainstream Deck: Combo Decks The Deck I Would Recommend: Black Blitz or the Pattern of Rebirth version of Secret Force (don't know the details yet)