Reinforcements

 is an active ability, which means the creature needs a full Bloodlust counter for it to activate.  For a list of all Cards with this ability, click here! 

Explanation
This ability only has a chance to activate if the creature has a full Bloodlust counter, and the enemy has more creatures in play, at the point where this creature is killed. It will put two fresh copies of the card in play, with full Health, and empty Bloodlust.