Theme
Having cards that work well with each other is called having good synergy. Aside from themes like Lightsworn or Gladiator Beast, there are also cards that work well with the attributes of your cards. For example, Rescue Cat is great if you have all Beast monsters. This is another form of consistency as you will start to get to the point where any handful of cards from your deck will be a strong and usable hand.
Specifically, look for ways to summon tribute monsters other than tributing. Also, keep an eye out for monster, spell, and trap cards that allow you to search through your deck for specific cards. Finally, recognize the weakness of your deck and keep some cards that will help sustain your strategy throughout a game. For example, if cards like Mirror Force or Smashing Ground is threatening to destroy that Synchro Monster you worked so hard to bring onto the field, pack a Book of the Moon to keep it safe.
Things to Avoid:
More than 20 Monsters
Since your deck is going to be only 40 cards, having more than 20 monsters in your deck means that you are more than 50% likely to have a hand of nothing but monster cards. This is not a good thing, as you will have no defensive traps or spells set to keep your strategy in motion. Rely on the synergy of your cards to find the monster cards you want and pack a few more of the staple spells and traps.
Huge Tribute Monsters
This is especially true for level 7 and 8 normal monsters, as they will often end up being dead cards in your hand. If you ever find a card just sitting in your hand for the entire game, then you should probably remove it from your deck. After playing several games with huge tribute monsters, it is almost certain that these monsters are utterly useless. If you can summon one of these, you probably were winning already and did not really need it at all.
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