From Cardsmiths LLC. The Currency Series 4 Trading Card Set offers collectors an experience like no other. With an expanded set of Collector Cards, there are a total of 70 different designs by artists bringing their unique vision to the series. We explore the foundations of traditional finance and emergent sectors, including decentralized finance and blockchain-based economies. Fortunate collectors may uncover rare variant cards, such as Parallel Holofoils, Meta-Rare Refractor™, and serial-numbered Gemstone Refractor™ cards. Look for randomly inserted Cryptocurrency Redemption Cards that can be exchanged for various amounts of Bitcoin, Ethereum, Litecoin, and Dogecoin, including 1 BTC and 1 ETH hits. You may even find a One of Twenty-One Bitcoin Card!