After you attacked with "Mei-Kou, Master of Barriers" equipped with "Malevolent Nuzzler", you can send the equip spell to the graveyard from where it can be placed back on your deck with its own effect. This way the spell can generate new spell counters next turn for another card.
This card can undermine "Skill Drain" as well as bothersome cards like "Prohibition" or "Royal Decree". You can use it to break locks that you have imposed.