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Poly, in the context of artifacts, is an obsolete term that used to denote an artifact as having no activated ability. The type was obsoleted with Revised. [1]

From the glossary of the Comprehensive Rules (April 12, 2024—Outlaws of Thunder Junction)

Poly Artifact (Obsolete)
An obsolete term that appeared on the type line of artifacts with activated abilities that didn’t cause the artifact to be tapped as a cost. Cards printed with this text have received errata in the Oracle card reference to simply say “Artifact.”

References

  1. Template:NewRef
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