This plain deck of cards looks crisp and new, suggesting that you are likewise new at the game.
Wondrous Item 360 gp
You can attune this deck of cards to yourself by shedding six drops of blood on it during a short rest. From that point forward, whenever you draw or deal a card from this deck, it is of a suit and value of your choice. Anyone else who interacts with the deck finds it to be a normal deck of whatever game it is designed for. Only one creature can be attuned to the deck at a time.
Published in Mordenkainen's Magnificent Emporium, page(s) 87.