Durin, the Shadowborne

Commander ninjutsu - Sacrifice an unblocked
creature you control. (Sacrifice an unblocked
creature you control: Put this card onto the battlefield
from your hand or the command zone tapped and
attacking.)

Whenever a Ninja deals combat damage to a
player, you may return it to its owner's hand.
If you do, you may put a creature card with
converted mana cost 3 or less from your hand or graveyard onto the battlefield.