Copy Artifact

You may have this enchantment enter as a copy of any artifact on the battlefield, except it's an enchantment in addition to its other types.

30th Anniversary Edition

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Masters Edition IV

You may have Copy Artifact enter the battlefield as a copy of any artifact on the battlefield, except it's an enchantment in addition to its other types.

Summer Magic / Edgar

The artifact to copy is chosen at the time this card enters. If there is no valid artifact to choose, then this card enters as an enchantment that has no effect.

The copy is both an artifact and an enchantment, so it is an artifact-enchantment (perhaps even an artifact-creature-enchantment). It can be affected by anything which affects either type of permanent.

The copy of the artifact is not still blue. It copies the color of the thing it is copying.