These allow you to heap auras onto one creature with little concern for your opponents removal
They make you more vulnerable, letting opponents kill your lands, but modern mass removal spells were designed to avoid killing artifact lands, rendering the drawback far less dangerous than it would otherwise have been
You have to do some work in Commander, but triggering the alternate wincon ability might be a puzzle worth pursuing
Problem is, its clearly been inching towards leaving for the past several hours, and its already well into the afternoon
The fact it's cheap and easily recursive means it makes the cut in many, many builds from kitchen table dominance to tournament powerhouse
Just remember, it doesnt have to be an opponents turn to trigger