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It can be used to Synchro Summon Cyber Slash Harpie Lady or activate Harpie's Feather Storm from the owner's hand in a Toon Deck

Power of the Guardians X SPELL Equip If an attack is declared involving the equipped monster: Place 1 Spell Counter on this card

There are some complicated interactions between the monsters in this archetype, so its not really to be piloted by brand-new players, but it certainly offers something different

Cherubini, Ebon Angel of the Burning Abyss lets you send a Level 3 or lower monster from your Main Deck, optimally one of the Phantom Knights

Time to OTK

It does allow for spicy combat tricks, and with two different modes, it's a sort of swiss army knife for whatever situation you might need it in