Black Joker
Mundus vult Decipi (The World Wants to be Deceived)
This is a common phrase in magic, but its origins and original meaning are what make it important to me. The philosophy of the Joker is that of self preservation, deception and self gain. The full quote is Mundus vult decipi, ergo decipiatur (the world wants to be deceived, so let it be deceived) is talking about religion as a tool to control others. According to the pontifex maximus: people should be deceived in religion, there are many truths which it is useless for the vulgar to know; and many falsities which it is fit the people should not suppose are falsities.
Probably my favorite single card, the joker has a few fun adornments. His face is both smiling and frowning – to illustrate the duality of mischief (deception). He also has an ace up each sleeve. He is adorned in the symbols of all suits, because his nature is apparent in every philosophy.