Little Myth Marker: Myth Adventures, Book 6

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.