Zai the Cruel

Flying
Hellbent- Whenever Zai the Cruel enters the battlefield or attacks, if you have no cards in hand, Zai the Cruel deals 4 damage to target other creature or player chosen at random.
When Zai the Cruel is put into a graveyard from anywhere, return it to its owner's hand at the beginning of the next end step.
"Blood is the only tribute acceptable."