I think its the five dragons synchro monsters
I believe the most powerful deck of 2009 is lightsworns because the winner of the last 2009 tournament used a lightsworn deck. You can check the tournaments on yugioh wikia.
Most likely a vanilla beatdown deck
The best deck for this card would most likely be a beast or an EARTH deck.
The deck that comes with the Yugioh gods and blue eyes white dragon in the Legendary Collection Collectors set. This set brought together some of the most popular cards from early in the Yugioh series.
I think the most powerful cards are the 3 monsters you get at the end of duel academy. Ulna, Rafael ,
His best deck has to be the one in episode 147-148
Well, the minimum in a yugioh deck is 40 cards maximum 80cards. Most people try to have a smaller deck over a larger deck, to get cards they need. About a 40-50 card deck is good.
there is not really a "most powerful" card in yugioh. it all depends on the circumstance and how you use it.
Most yugioh structure decks cost around $12 in a store, though they usually only have the newest ones; each deck varies in cost from about $8-$15. I recommend going to www.gamingetcstore.com to get anything yugioh card related, because their prices are reasonable.
Look on youtube. Half/most of the yugioh card videos feature people selling decks. A lot of them all rares.
In terms of stats, Dragon Master Knight and Five-Headed Dragon each have 5000 ATK and DEF.
There is no such thing as "the most powerful". It depends on the deck you run; weak monsters can execute incredibly powerful combos. Infernity Archfiend and XX-Saber Emmersblade are two such examples; they perform terrific combinations with other cards while being rather lackluster in stats. The cards in the game that inspire fear into other players hearts are those like Dark Armed Dragon, Judgment Dragon, Infernity Launcher, XX-Saber Faultroll, Blackwing Armor Master, and other cards that define metagames. If you are just going for the "brute force" tactic and looking for the most powerful cards in terms of attack, the current two Yugioh cards with the highest printed attack points are Five-Headed Dragon and Dragon Master Knight, both of which have 5000 ATK. Other monsters such as Armityle the Chaos Phantasm can get up to 10,000 ATK. In the anime, the most powerful cards would probably be those in the Orichalcos series, as they're incredibly powerful and are just too broken for use in the real game. Divine Serpent is one example (infinite ATK? what?) The God Cards are pretty darn powerful too, but they're difficult to get out. Yugi makes it look easy. It's not. Yugi stacks his deck. ;D
The R.K.O