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You can only use this effect of "Harpie Perfumer" once per turn

The only other creature with shadow in my cube can't block so this is basically unblockable which makes this as reliable as any other looting effect dork

Considering the base value of cost and effect of these abilities for your deck is better than evaluating the Battle by its transformed side, since it requires more effort to use

It's trained on thousands of real graded cards

It increases its ATK by 500 for every "Dark Magician" card in both Graveyards, so make sure to keep "Dark Magician" in your Deck

Of course, repeated activated abilities isn't the only way to spend your excess energy