Niak Roviask, the Vengeful

Flying
Whenever you cast your first spell each turn,
choose an opponent at random. Niak Roviask,
the Vengeful deals damage equal to is power to
that player or a planeswalker that player controls.
When Niak Roviask, the Resting dies or is exiled, return it to its owner's hand at the beginning of
the next end step.