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#2 Untimely Malfunction Set: Duskmourn: House of Horror Market Price: $7.02 Whether in competitive sideboards or as part of the 99 in Commander decks, Untimely Malfunction works (ironically) as a flexible tool that can fix nearly any situation a red mage might find themselves in

You will want to keep your cards waterproof and not use rubber bands (rubber bands can damage the cards)

CLOSECLOSE BT16-040 R Digimon Lv [Counter] Blast Digivolve [On Play] [When Digivolving] [When Attacking] [Once Per Turn] By placing 1 [Royal Knight] trait card from your hand or trash as this Digimon's bottom digivolution card, delete 1 of your opponent's Digimon with as much or less DP as this Digimon

Like with any investment, you will want to diversify your card collection to ensure it retains its value