Frumious Flumph (Your Grace/Your Eminence)
I suspect that another interesting by-product of the popularity of the deck of many things is "card magick." There have been magic-users who specialize in effects based on cards, and they usually integrate with that game's version of the deck of many things.
- Talislanta 1st edition (1987) introduced the zodar deck, a 20-card deck that integrates with the setting's weird cosmology. The Rahsatran people of the setting use the cards to perform magic spells. In 4th edition Talislanta (the Big Blue Book), Cartomancy was one of the default magic systems. Since the system used a freeform magic system, there are only example spells, but the idea seems to be the spells are based on the symbolic meanings of the cards. For example, the spell Friendly Hand involves drawing the card The Assassin (meaning: treachery, betrayal) and then taking on the illusory appearance of a person friendly to your target.
- Rolemaster Companion VII (1993) had both the tarot of many teachings item, and the Tarotmage class. The Tarotmage had several spell lists with powers based on both the symbolic meaning of the various cards, and the physical imagery of the cards themselves. The ultimate magickal working of the Tarotmage was to create a tarot of many teachings.
- Palladium Fantasy RPG (The Rifter #13, January 2001) has the Deck of Fate which was made by the "Fate Priests," and I've also been informed that the game has Trickery Magic which theoretically could interact in interesting ways, since Palladium is more about the Rule of Cool than balance. I haven't been able to locate Trickery Magic yet, so I can't determine what the interaction is.
- More recently, user /u/saequis on Reddit uploaded a homebrew Warlock pact, the Pact of the Deck, which is pretty interesting and has an optional feat to interact with the deck of many things.