This is a "design that sounds neat" rather than anything intended to purposely interact with or support other cards in the set. If people believe it shouldn't be here, I will replace it in the future with another design.

Seems fine to me to have a handful of cards like that at rare. A more standard template for the last sentence would be "Any player may activate this ability, but only if they don't control a permanent named ~." I wonder if it should be sorcery speed, too