Mountain Pass Thief

When Mountain Pass Thief enters the
battlefield, choose a land type. It gains
landwalk of the chosen type.
Whenever Mountain Pass Thief deals combat
damage to a player, create a 0/1 red Dragon Egg creature token with defender. It has "When
Dragon Egg dies, create a 2/2 red Dragon
creature token with flying and "{r}: This creature
gets +1/+0 until end of turn."

Stealing Dragon Eggs is the dumbest idea, no man would even think of smuggling those!