Xira Arien, Hive Assassin

Flying
{1}{b}{r}{g}, {t}: Put three time counters on target creature. It gains vanishing and
"When this creature dies, if it had no time counters on it, Xira Arien's controller
creates a 1/1 black, red, and green Insect creature token with flying. Otherwise,
Xira Arien's controller draws a card."