If you do that, you unlock your graveyard, and you can cast flashback cards for cheap, or use mayhem while drawing and discarding
While many auctions are won by unknown buyers, recently-retired rapper Logic - known for songs including 1-800-273-8255 - revealed that he was the new owner of the shiny Charizard card, tweeting that he had made the winning bid
If on the field, you can send an Impcantation Monster from your hand or field (including itself) to the Graveyard to target and destroy a card the opponent controls
This ability allows you to search your deck for any Supporter card when you play Meowth from your hand to your bench
Such maladies with the AI include occasionally giving purely beneficial equip cards to your opponent's monsters, just plain not using cards, summoning monsters like Sphere Kuriboh (weak monster works better as a hand trap than being summoned) or Labyrinth Wall (zero attack) in attack position, and using cards like Enemy Controller on things when there's no need to or it puts you in a worse situation