Indestructibility

Granting a single keyword to a single permanent, with no body and no rider, is the kind of clean, narrow design that lives or dies on whether the keyword it grants is worth four mana and a card. The bet here is that for the most valuable thing on your battlefield, the answer is yes. As an Aura it carries the obvious two-for-one risk: an opponent who points removal at the enchantment, or bounces the creature back to hand, undoes both at once. What it buys in exchange is total immunity to the most common removal verb in the game. "Destroy" is the workhorse of white, black, and red interaction, and combat damage simply rolls off, so the protected permanent shrugs at board wipes that destroy and at the lightning that would otherwise end it. The cracks are precise and worth knowing: exile, bounce, -X/-X effects, and sacrifice all sidestep indestructibility entirely, since none of them destroy. An edict still kills the creature because the controller is forced to send it to the graveyard, not because anything assaults its durability. The card rewards matching answer to threat rather than handing out a blanket safety net. It remains the cleanest stand-alone way to hand a creature, a planeswalker, or any other permanent indestructibility without committing to a creature that grants it, and it has stayed the reference point for the effect long after splashier versions arrived.