Artful Reworking

Create a 1/1 colorless Thopter artifact creature token with flying.
Whenever you attack with three or more artifact creatures, you may pay {3}{w}{w}. If you do, put Artful Reworking from your graveyard onto the battlefield transformed.
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"We're making the world a better place . . ."
—Petra "Newface" Amov