mtg midnight hunt booster box Innistrad: or special card from Magics history (a card from The List) Collector Booster Box Mtg Consider

By using it multiple times, she's able to quickly force her opponents to deplete their decks

2 Ultra Rare Cards (each of which has an individual 1-in-6 chance of being upgraded to a new Prismatic style Collectors Rare or new Prismatic style Ultimate Rare)

There are some incredibly expensive cards one can potentially find online, but a lot of them are very old cards, maybe playtest versions of existing cards, or mint copies of Black Lotus

Their owners shuffle those cards into their libraries

Besides only being used during the GX fight that has been mentioned a few times, it also just isn't that strong of a card, which is likely why it would be forgotten by fans