The rules for Prophet's Gambit are available here.
The Vistani have long been masters of fortune-telling. In the hands of a Vistani seer, a deck of tarokka cards can tell tales of the future and provide answers to many a dark and mysterious question.
Although the workmanship and artistic quality of the cards can vary from deck to deck, the ability of the cards to call forth information about the future is far more valuable than the monetary worth of a deck.
Anyone can craft a deck of tarokka cards, but only someone of Vistani blood can imbue the cards with the gift of prophecy. Once they are crafted and empowered, they must be stored in accordance with ancient tradition, or they lose their efficacy. When not in use, tarokka cards must be wrapped in silk and stored in a wooden box.
Composition
A tarokka deck has fifty-four cards, each of which has its own name. Forty of them comprise the common deck, which is divided into four suits: swords, coins, stars, and glyphs.
Each suit contains cards numbered one through nine, plus a tenth card that is called the master of that suit. A card can be referred to by its suit designation or by its name. For instance, the three of glyphs is also known as the CoS, and the CoS card is also known as the master of stars.
The remaining fourteen cards make up the high deck, which symbolizes the natural forces of the multiverse. These cards are represented by a crown symbol and are the most powerful cards in the deck.
High Deck
The cards that compose the high deck aren't considered to be one suit, although they are often denoted with a crown icon to mark their importance. Rather, each card is an important power in its own right. If one of these cards comes out in a casting and seems to contradict the prediction of an earlier card, the Vistani always assume that this card takes precedence.
Common Deck
The four suits and their respective cards are described in more detail below.
Swords
This suit symbolizes aggression and violence. It is the suit of warriors, be they paladins, soldiers, mercenaries, or gladiators. It also symbolizes the power of governments and leaders, whether noble or corrupt.
Stars
This suit symbolizes the desire for personal power and control over things beyond the ken of mortals. It is the suit of arcane mages, sages, and intellectuals. It also represents the triumph of magic, science, and reason over religion, mysticism, and superstition.
Coins
This suit symbolizes avarice and the desire for personal and material gain. It is also symbolic of gluttony, lust, and obsession. On the side of good, this suit can suggest the accumulation of wealth for the benefit of a charity or a just cause. On the side of evil, it embodies the worst aspects of greed. It speaks to the power of gold, and how that power can build or destroy nations.
Glyphs
This suit symbolizes faith, spirituality, and inner strength. It is the suit of priests and those who devote themselves to the service of a deity, a higher power, or a heightened philosophy. On the side of good, it represents willpower and dedication. On the side of evil, the suit signifies weakness of character, self-doubt, and betrayal of one's ideals or beliefs. It symbolizes health and healing, as well as illness and disease.