Kennen, Heart of the Tempest

Ninjutsu {p/u}{p/r}
Mark of the Storm - When Kennen, Heart of the Tempest deals damage to a creature, that creature gains a lightning counter for as long as it's on the battlefield.
{t}Kennen, the Heart of the Tempest deals damage equal to it's power to each creature with a lightning counter. Each creature then receives 1 Stun Counter.