Vex Autumnleaf

{w/b}{w/b}: If Vex is a Citizen, it becomes a Halfling Scout with base power and toughness 2/3 and lifelink.
{b}{b}{b}: If Vex is a Scout, it becomes a Halfling Rogue with "Whenever this creature deals combat damage to a player, that player loses the game if the Ring has tempted you four or more times this game. Otherwise, the Ring tempts you."