A tube or sleeve is ideal for long-term storage
There are several low-effort things you can do to ensure it doesnt become a pile again
+Hatchet Man: Not the most useful card, but it helps fulfill the requirements for Practice Makes Perfect, and the tends to be more useful when Mandy has no real capability to use
If this card is Ritual Summoned: You can destroy as many face-up monsters your opponent controls as possible that were Special Summoned from the Extra Deck, and if you do, inflict 1000 damage to your opponent for each, and if you do that, this card can make a second attack during each Battle Phase this turn
Are Japanese Yu-Gi-Oh
After Standard rotates, some of the cards will see price drops, but some of most expensive cards from the set stay at the top, like The Immortal Sun from Rivals of Ixalan or Finale of Devastation from War of the Spark