Little Myth Marker

Skeeve bluffs his way into a high-stakes game of dragon poker-and wins! But now he's left with Markie, a pint-sized IOU left by a player who went broke. She conjures up a house full of trouble every time she tries to cast a spell. And now the dragon poker champion has challenged Skeeve to a game-with a pot of half a million.
Jealous opponents of the young magician Skeeve and his demon mentor hire a top Character Assassin to force them out of business.