Great Grey Wolf Sif

Great Grey Wolf Sif cost {2} less to cast if you have a creature named Artorias the Abysswalker in your graveyard.
Vigilance, Protection from black
Artorias gave his shield to his companion to protect him from the abyss. Now Sif watches over his master's grave when a warrior with a familiar scent arrives. To protect you from the same cruel fate as Artorias'. Sif takes up his master's sword.