Kennen, Heart of the Tempest

Ninjutsu {u}{r}
Whenever Kennen, Heart of the Tempest deals
combat damage to a player, exile up to one target instant or sorcery from your graveyard. Then
copy each instant and sorcery card exiled with
Kennen, Heart of the Tempest. You may cast
those copies without paying their mana cost.
{u/r}{u/r}{u/r}: Return Kennen, Heart of the Tempest
from the battlefield to its owner's hand.