Shadowstep

 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
always activates on attack. It may only work against creatures of a certain Race.

Strategy
Shadowstep works well with Diableria to build a fast deck, that can defeat your opponent before his big monsters become active! Try using creatures that cannot be blocked by ANY creatures, such as Crypt Fiends and Robotic Hounds, which are tough enough to survive for a few attacks, and Straw Demons and Tomb Bats which have a chance to dodge/come back to life!