Careful Study was good enough to be played in decks where you could abuse the discard, Faithless Looting is good enough that you can play it in most red decks regardless
Obscure promos can be excellent, but they need clearer documentation and a buyer who already knows why that version matters
Legendary Creature Moogle Warrior Lifelink Dance At the beginning of your end step, each player may discard a card
A sealed Draft Booster Pack from the Streets of New Capenna set for Magic: The Gathering
A problem in just about every format where it's legal, this sort of colorless card draw slots into every deck so easily, and the protection ability all but guarantees you'll have enough time to draw at least the first chunk of cards
While Red Card can be powerful, having two will not help you if your opponent is not playing Evolutions