Spectral Guardian

Protection that points outward instead of inward, which was a rare design instinct in its era. The body is a forgettable 2/3, but the static effect is a blanket: every noncreature artifact on the battlefield becomes untargetable as long as this Spirit stays untapped, yours and your opponent's alike. The conditional is the whole design. Most permanent-anthem effects of the period were "always on" auras or enchantments; tying the protection to an untapped state builds in a clock that opponents can attack. They cannot target the artifacts directly, but they can answer the source, and they can bait the tap. That single restriction is what keeps a sweeping shroud effect from being oppressive: the guardian has to be standing watch, and standing watch is itself an exploitable position. The flavor lands cleanly too, a sentinel whose vigilance lapses the moment it acts. It is a piece built for a deck leaning on a key artifact or two it cannot afford to lose, where blunting targeted removal and disruption is worth a four-mana investment in a creature that does nothing offensively. The symmetry cuts both ways, of course, which sharpens the cost: your opponent's artifacts gain the same shroud while the guardian stands, so the effect rewards a board where you have more to protect than they do. Narrow by design, but the design is honest about its tradeoff in a way a lot of contemporary protection effects were not.