If you really love a sleeve you can set it as your default and each of your decks will use that sleeve unless you specify another
If youre not sure you want to sell / give away / recycle some of your cards, you can always keep them sorted in your regular sorting order in a separate box and put that box not with the regular collection elsewhere
You can use foreign language copies of legal-for-play cards printed for the TCG market, as long as you can show an official translation of the card, kept outside of your Deck and Deck box, when asked to do so by an opponent or tournament official
These watermarks use a dot-based grid system to encode the printer's serial number and the exact date and time of when each card was printed
These parts include the set/expansion symbol, the frame, the color of the border, the rarity, the copyright symbol and date (if applicable), the corners, the foiling, and the art
The flash makes it look good, but you will only play it after your opponent plays a creature, which they might not always do