This card featuring Mimikyu is a Cosmos Holo and comes from the Paldean Fates set, though the same card has been reprinted many times for a variety of sets over the years
This is a core tension underlying this entire array of cards and theres no clear answer
Arguably, it started all the way back when Wizards announced that Arena wouldn't have dusting, because dusting is bad for players, since players don't like destroying cardswe might accidentally destroy something we end up wantingeven though an economy with dusting makes it much easier for players to figure out how much it actually costs them to play the game, as compared to the current convoluted and random system
Based on the latest market prices tracked on TCG Stacked, a foil copy of Smothering Abomination is worth about $8.09 USD
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Jokes in this set range from Magic in-jokes like Look at Me, I'm the DCI, a joke about how seemingly random Magics banned list policy was, or Urza's Contact Lenses, poking fun at the fact that there are a lot of cards in the game that depict items that Urza once owned, to downright absurd cards like Charm School that tell you to balance a card on your head