Gandalf the White returned from the dead by the grace of the Valar, didn't he? He no doubt received some kind of power-up, since he was able to put down Saruman.
Sauron had fallen from the Valar's grace, and the Ring was made from his own power, not that of a higher being.
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He lifted his staff, and Gimli's axe leaped from his grasp and fell ringing to the ground. The sword of Aragorn, stiff in his motionless hand, blazed with a sudden fire.
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Although -
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And so am I, very dangerous; more dangerous than anything you will ever meet, unless you are brought alive before the seat of the Dark Lord.
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I am Gandalf, Gandalf the White, but Black is mightier still.
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Those are against my theory.
Perhaps Anduril/Narsil is only "magical" against the foes of Gondor, as Sting, Glamdring and Orcrist glow blue only when Orcs are present.