The card “Harpie's Feather Duster” provided by this skill is very useful and can win you a duel, but getting it is not so easy since you need to banish 6 Harpy monsters from your graveyard, to do this, your match must be a long one and it is not recommended to discard your harpies just to use this effect, the spell is nice but isn’t worth that sacrifice.
6 "Harpie" cards in your Graveyard are banished, and 1 Harpie's Feather Duster card is added to your hand from outside your Deck.
This skill is rarely used due to such difficulty on activating it, and since we have Harpies' Hunting Ground skill, Harpies’ Last Will is just too weak in comparison to a field spell that can help you from the beginning until the end of the duel.
I'm actually trying to find a good decklist to use this deck with new support but it's hard... Tried Painful decision with harpie ladies/harpie girl, Monster gate with 3 sisters and 2 Harpie's pet dragon, the trap card that mill 5 of your own deck, but nothing really consistant... anyone has an other idea ?