Although my own experience hasn't shown that to be meaningful
Croagunk 78/123 - Mysterious Treasures Reverse Holofoil Croagunk 78/123 - Mysterious Treasures Reverse Holofoil The Pokmon Company Flip a coin
Starfield VocalistStarfield Vocalist, PanharmoniconPanharmonicon, Virtue of KnowledgeVirtue of Knowledge, and Yarok, the DesecratedYarok, the Desecrated These cards are where most people's minds go when they think of cards that double up on abilities
PSAs standards allow very slight imperfections even at 10 (for instance, very minor centering off by up to 55/45 is acceptable)
(2019-07-12) If you control more than one Bag of Holding, you choose which one will hold the discarded card
People just genuinely love Gengar, and that love has kept prices strong for years