Great Grey Wolf Sif

Trample
When Great Grey Wolf Sif enters the battlefield, search you library for a card named Greatsword
of Artorias and put it onto the battlefield. Then shuffle you library. Until the end of turn, if Great
Grey Wolf Sif deals combat damage to a player
you may pay {0} rather than pay the equip costs of
equip abilities that target Great Grey Wolf Sif.