That card is usually filler, but it was great here, as I could spend 1 energy on it, then 3 energy on something else like Phyrexian Ironworks to draw a card off Izzet Generatorium
SR Super Rare Dangerous Machine Type-6 X SPELL Continuous During each of your Standby Phases: Roll a six-sided die and apply the result
Lower Text Overflow (-4) (As this card moves from the field or under a card to an area other than those, lose 4 memory.) Promo Info Advance Decks AMETHYST MANDALA [ST-22] CLOSECLOSE ST22-06 SR Digimon Lv [All Turns] When any of your Digimon with [Renamon], [Kyubimon], [Taomon] or [Sakuyamon] in their names would leave the battle area other than in battle, by trashing this card, 1 of those Digimon doesn't leave
Since the store still needs to make a profit and find a final buyer, you get trade-in value. Most comic stores accept cash and store credit
Clearly, a damaged card is soiled in the eyes of most people, unless it holds some sort of memory to it, in which case its more personally valuable than anything else