I don't know....

[Agent9]

Why does everydeck have to focus on something? like chaos focuses on the chaos monsters? why can't their be a deck....that's merely adding cards to the mix...? I understand being a good duelist means running a theme...but why can't someone be like yugi? whatever card he gets he uses? I've run decks that focus on nothing but eliminating the field and destroying the opponents cards with basic cards? I'm asking..Why do we need themes?

 

[Zaikiro]

Why does everydeck have to focus on something? like chaos focuses on the chaos monsters? why can't their be a deck....that's merely adding cards to the mix...? I understand being a good duelist means running a theme...but why can't someone be like yugi? whatever card he gets he uses? I've run decks that focus on nothing but eliminating the field and destroying the opponents cards with basic cards? I'm asking..Why do we need themes?

Yugi uses spellcasters.

A deck has theme's because if you focous on it, you can win the game with stragties from that theme. If you have a mix of cards, how you win? Having a theme is knowing what have in the deck and how to use it.

And the TV decks arent as good as they seem.

This may help also.

In this game, you'll get nowhere fast by tossing in all your cards into your deck and entering a tournament. A theme could be a deck focusing on one type of card (Monster, Spell, or Trap), focusing on an Attribute or Type, or an alternate win condition (Exodia, Last Turn). There are also decks that simply focus on attacking all-out for the win using high-ATK monsters.

 

[digi-kun]

My friend plays a annoyance themed deck (AKA Nobleman of Crossout has potential of obliterating this deck) focuses on effect creatures, creatures like Swarm of Scarabs, flip creatures, and adding a bit of beatdown to finish them off

me, i run annoyance/beatdown on a decently sized budget(i usually don't go buying packs XD)(and i got a bunch of free old school so meh XD)

themes are mainly going by a certain type or attribute, which would be the easiest to make
Warriors tend to be really popular these days, there's the machine, spellcaster, dragon etc. with the theme decks

and ya, the TV decks aren't as good as they seem XD
really what i use the TV show for is combos, other than pharoh's memory of course XD

 

[Mullet]

I've run decks that focus on nothing but eliminating the field and destroying the opponents cards with basic cards? I'm asking..Why do we need themes?

Sorry to burst you bubble, but that's a theme too.:\

 

[Agent9]

what a mix of cards that just combo with 1 or 2 other cards? there's like a lot of diversity in the deck i run..

 

[SleepyGomamon]

Having a theme makes a deck more focused. It helps you set a goal around which you can construct; if a card enhances the theme, it's in, if it doesn't, it's out...so it can be a useful deckbuilding tool.
Having a largely random deck can work, but it probably won't go as smoothly as it could. The main advantage would probably be against opponents who are familiar with all the current, popular deck types, since it might trick them into misinterpreting your strategy if they see a card that they think goes in a certain deck.

Plus, people build themed decks because...they win matches. If a certain theme really works, then of course people are going to go with it.

As for TV decks...most of them really are predictable and not so hot in real life. Just think how it would have gone if nearly everyone was fielding mass destruction cards like Raigeki and Harpie's feather duster, or counters like Magic jammer up through the Battle city arc. XD

 

[Forci Stikane]

...Yes, a theme is good,...but on the other hand, a deck without a specific theme can work...after all, MY main deck doesn't really have a theme, and it works wonderfully.