I got rid of the "If that artifact is put into a graveyard this way," part and added the link to the card with altered text.
ability=Whenever this creature transforms into SN, you may destroy target artifact.~SN deals 3 damage to that artifact's controller.;\
At the beginning of each upkeep, if a player cast two or more spells last turn, transform SN.
oracle=Whenever this creature transforms into Werewolf Ransacker, you may destroy target artifact. Werewolf Ransacker deals 3 damage to that artifact's controller.\nAt the beginning of each upkeep, if a player cast two or more spells last turn, transform Werewolf Ransacker.