Deathless Ronin

Afflict 3 (Whenever this creature becomes blocked, defending player loses 3 life.)
At the beginning of your end step, if a player lost
3 or more life this turn, you may return target
creature card from your graveyard to your hand.
{2}{b}, Discard a card: Return Deathless Ronin
from your graveyard to the battlefield tapped. Activate this ability only during your turn.