Trading card players have a common enemy, regardless of the game they prefer. This common enemy is the wear and tear of the cards. This is bad because some of the cards can sell for a lot of money, especially when they're in mint condition.
Keeping the cards in a good shape is not difficult. All the players need are some card sleeves. The ones made by the Dragon Shield and fond here are a very good choice. These card sleeves are transparent on one side and matte yellow on the other side.
The type of plastic used for these sleeves is specially designed to allow players to use their cards while still in the sleeves. The package contains 100 sleeves and you can store at least 75 cards in their sleeves in the box.
You'll have to measure your cards though, These can't be larger than 63×88 mm or 2½ x 3½ inches. You can write on the label on the top of the box if you have more decks and you want to easily find the one you're looking for.