The fourth card is Clear Kuriboh, the Kuriboh from the Dark Side of Dimensions movie. You can discard it to stop one of your opponents monsters from doing effect damage, and when it’s in the graveyard and your opponent attacks directly you can banish it to draw a card, and if it’s a monster special summon it. The second effect seems more useful, drawing a card no matter what, and you might get to summon a higher level monster with it.