Tsunade Senju

Ninjutsu {4}{g/u} ({4}{g/u}, Return an unblocked attacker
you control to hand: Put this card onto the battlefield
from your hand tapped and attacking.)
When Tsunade Senju enters the battlefield, regenerate each creature you control.
{1}{g}: Regenerate Tsunade Senju.
{3}{u}: Return Tsunade Senju to your hand. Play
this ability only if Tsunade Senju is the target of
a spell or ability an opponent controls.