Yugioh Analysis - Deck Making

I only follow one rule when i make decks. It's that every card has a purpose for all the other cards. I call that a deck that has "SYNERGY". Meaning all cards i put in a deck must work well with any other card. I don't like a deck like Lightsworns because a Ryko might mill something like a mirror force or dark hole and you just happened to ruin your next top deck. In a deck everything must have a purpose and every card should be able to stand for itself.