For example, if youre building a deck around Urza, Lord High Artificer, you probably want a ton of cheap artifact creatures you can tap for mana, and then big heavy hitters you can cast with his second ability and all of that mana you generate
In the final duel with Yugi, he showed a duel that utilized level in many ways, such as using Barbaros' high level to deploy a large number of low-level monsters from the deck, adjusting the level of monsters on the field to bring out monsters of the same level from the graveyard, and making consecutive attacks according to the total level of the opponent's monsters
Feel free to copy these paragraphs should a dispute come up in your games
This happens because usually, the front part of the cards is glued at the top of the proxy, and when theyre bent, the glue fails and the top layer falls