The Sapron Hand (Ranger's Deck) by Rosaire Bushy

Changing from his dragon form to that of a Ranger, Mieragon accepts an old woman's request to let her lay before him the Peccramae, a series of cards to tell one's fortunes. With magic at their center, the cards remain blank - except one. To discover what the remainder show, Mieragon needs to solve the riddle of the first.