Deck of Yu-Gi-Oh Cards (5e Equipment)
From D&D Wiki
An unconventional Deck of Playing Cards with monsters, spells and traps on their faces with some more information unique to most cards, such as; attack, defense, rank, attribute, and type(Note:it's just like the cards from Yu-Gi-Oh, if you haven't seen it please watch it!) These cards can only be used as powerful weapons by a Card Master. The Deck must be 40 to 60 cards. You can only have up to 3 copies of the same card in your Deck.
Cost: varies (Depending on what cards are in the deck)