When you think about it, most card games are really all about probability, you know—math. So it only makes sense to use a deck of cards that simplifies the suits and numbers into math functions. The Functions Card Deck replaces hearts, clubs, spades and diamonds with + – x ÷ and uses platonic solids for face cards. Jokers are represented by the symbols for inequality and infinity and the suits are divided by positive and negative rather than black and red. If you’ve been taking too many risks lately this is the perfect deck to force you to think more logically. Designed by Tauba Auerbach and limited to 250 decks.