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The colourless mana cost and artifact typing is just the cherry on top

All damage that would be dealt to Progenitus is prevented

Assuming that the creatures that you copy also have triggered abilities, you might get a ton of value

While the blue-black decks would occasionally need to turn to Dream Twist to mill themselvesthis was particularly common in decks that were loaded up with Stitched Drakes so they could, you know, actually cast their 3/4 fliers on turn threeunder most circumstances, a couple of Armored Skaabs, a Deranged Assistant, and a Forbidden Alchemy would be a more than sufficient amount of self-mill for their decks to work