I think the deck that one the yugioh world championship 2007 was the "Elemental Hero deck" if I'm not utterly mistaken.
Additional: This answer is horribly wrong. The winning decklist is:
Monsters: 22
3 Cyber Dragon
3 Card Trooper
3 Gravekeeper's Spy
3 Raiza the Storm Monarch
3 Dekoichi the Battlechanted Locomotive
1 Treeborn Frog
3 Thestalos the Firestorm Monarch
1 Sangan
1 Morphing Jar
1 Spirit Reaper
Spells: 13
2 Brain Control
1 Soul Exchange
1 Scapegoat
1 Pot of Avarice
1 Book of Moon
1 Premature Burial
1 Heavy Storm
1 Snatch Steal
1 Mystical Space Typhoon
1 Confiscation
1 Nobleman of Crossout
1 Machine Duplication
Traps: 6
2 Trap Dustshoot
1 Call of the Haunted
1 Torrential Tribute
1 Mirror Force
1 Ring of Destruction
Side Deck: 15
2 Banisher of the Radiance
1 D. D. Crow
2 Pulling the Rug
2 Mobius the Frost Monarch
1 Twister
1 Des Wombat
2 Royal Decree
1 Mind Crush
3 Hydrogeddon
http://entertainment.upperdeck.com/yugioh/en/events/article.aspx?eid=14&aid=2792
i think this deck's better:
vorse raider x3
dumanes dark witch x3
dark blade x3
ninja grandmaster sasuke x2
x head cannon x3
skilled dark magician x3
majestic mech ohka x3
blowback dragon x2
summond skull x2
white horned dragon x3
black luster soilder envoy of the begining x2
chaos emperor dragon envoy of the end x2
monster reborn x3
raigeki x3
harpies feather duster x3
sealed gold coffer x3
foolish burial x3
mystical space typhoon x3
sakuretsu armor x2
widespread ruin x2
magic cylinder
mirror force
waboku x3
wall of revealing light x2
mirror wall x2
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Most likely a vanilla beatdown deck
bubble beat
If you have a deck that needs monsters sent to the graveyard like a lightsworn deck, then you might win.
I dont know, it should be 40+ cards
The Best Way to get PPolymerization right at the start of the game is to trade it. I traded from my other game (World Championship 2007) most of a E-Hero Deck. I Thrashed EVERYONE!!! Anyway, Good Luck Submitted By Yugioh Champ