Aito Echizen, 7 Seas Seekers

Flash, double-strike, protection from instants
When Aito Echizen, 7 Seas Seekers enter the battlefield, you may counter target spell. If you do, return Aito Echizen, 7 Seas Seekers to its owner's hand.
Each time Aito Echizen, 7 Seas Seekers blocks or becomes blocked, prevent all damage that would
be dealt to him until your next turn.