Nightfall

 is an active ability, which means it will only activate once the creature has a full bloodlust counter.  For a list of all Cards with this ability, click here! 

Variations
can appear as certain activation, or with a chance to activate. It can activate during the card's turn, upon leaving play, or upon being attacked. The damage varies from 1 to 3 damage. It can target one, several, or all enemy Creatures.