Ghoulwalker Maiden

{t}: Summon 2 2/2 White Human Creature tokens with "When this creature is destroyed, summon a 2/2 Black Ghost creature token."
{w}{b}: Untap Ghoulwalker Maiden
When Ghoulwalker Maiden is summoned, summon 2 2/2 White Human Creature tokens with "When this creature is destroyed, summon a 2/2 Black Ghost creature token."