Those include cards illustrated by well-known artists, Secret Rares that arent revealed until someone pulls one, or promo cards that were never part of a set to begin with

They have 12 or 13 cards instead of 15, and their card distribution is pretty complicated: 1 art card (5% chance of a signature variant) 1 land (15% chance of a foil land) 6 connected cards 35% chance of 5 commons, 1 uncommons 40% chance of 4 commons, 2 uncommon 12.5% chance of 3 commons, 3 uncommons 7% chance of 2 commons, 4 uncommons 3.5% chance of 1 common, 5 uncommons 2% chance of 6 uncommon 1 showcase variant 2 wildcards of any rarity 49% chance of 2 commons 24.5% chance of 1 common, 1 uncommon 17.5% chance of 1 common, 1 rare/mythic 3.1% chance of 2 uncommon 4.3% chance of 1 uncommon, 1 rare/mythic 2.6% chance of 2 rare/mythics 1 rare/mythic 1 foil of any rarity 1 token/ad card with a chance of being a card from The List You basically sacrifice the boosters ability to be used in a Draft for a chance at multiple rares
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While many competitive cards lose value once they rotate out of the Standard format, Gengars status as a fan-favorite has kept its market price climbing, currently sitting around $160