Lifelink

Here is a keyword printed as a teaching tool. By the time lifelink became an evergreen ability with its own reminder text, the design needed a way to demonstrate it in the abstract, divorced from any creature whose stats might distract from the lesson: this is that demonstration. Strip the keyword off a vampire or an angel and bolt it onto a one-mana Aura, and what remains is the cleanest possible statement of what lifelink does and nothing else. The cost is the giveaway. Granting an evergreen combat keyword for a single white mana looks generous until you account for the structural tax every Aura pays: it spends a card to enhance a creature that can die in response, leaving you down two for nothing. That fragility lets a stat-blank enabler like this exist at this rate without warping anything. As an enabler it points the same direction as cards that turn life gain into a payoff, where a single large lifelink swing converts combat math into a resource you can spend elsewhere, though absent that engine it reads closer to a glossary entry than a deck slot. The honest read is that this is lifelink rendered as a standalone object: useful when a format wants a cheap way to staple the keyword onto something that lacks it, instructive everywhere else, and a reminder that some cards exist to make a mechanic legible rather than to be played.