It inflicts piercing damage to the opponent, which is mediocre, but then if it inflicts some form of battle damage via the effect, the player can draw two cards and discard a card
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The equipped monster cannot attack or be targeted for an attack
God of Fright, indeed.
They do not have the ability to destroy Spell and Trap cards innately, but their Field Spell Card, "Harpies' Hunting Ground" allows them to destroy a Spell or Trap Card each time a "Harpie Lady" card is Summoned in any way, in addition to their iconic "Harpie's Feather Duster"
Since you can search with Terraformingand copy with Pseudospace, you can draw more and more if you use Library Exo