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Generally, theyre artifacts that dont do very much by themselves, but if you tap creatures with total power equal to or greater than their crew cost, they become artifact creatures with the power and toughness displayed in the bottom right of the card

But making it the reward of a difficult transform condition makes it hard to recur, which is crucial for balancing extra-turn effects

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It was all over marketing, and its reasonable power levels mean it still sees regular play

It's a great way to close out a game if you manage to generate infinite mana