Yu-Gi-Oh Engineering?!

So recently, I've started to pick up a trading card game that I had retired long ago in middle school. This game is called "Yu-Gi-Oh!" When I had retired from the game, it was for primarily two reasons; there was no one to play against and the game was simply seen as childish or nerdy. However, after rediscovering my old cards and deck, I brought them to UIUC for when I needed to kill time. Surprisingly, I have found many people who played or haven't ever touched it who wanted to pick up the game; even people who you wouldn't normally think played this game. What I've found is that there lies a side to Yu-Gi-Oh! that most people don't recognize. The real fun of the game is building a deck, filing it with strategies, and then watching those strategies come to life. This I find is like an engineering side to Yu-Gi-Oh! I have never seen before. Due to this reason, right now, I've built around 7 decks with the cards I have. Truely, this children's card game has an unchildish side to it.