Metropolis Reformer

Hexproof on a creature usually protects the creature; here it protects you. The line "You have hexproof" is doing something structurally strange: it grants the player-level keyword that Leyline of Sanctity and Witchbane Orb hand out, but staples it to a 2/3 body that can be answered by any burn spell or removal. That inversion is the whole design tension. Your face is untargetable while it lives, so the discard spells, the direct-damage-to-player finishers, the Thoughtseize effects all whiff; the trade is that the source of your protection is itself a fragile, targetable creature, and once it dies the shield is gone. The damage-to-life clause deepens the same logic: any burn aimed at the Reformer in an attempt to remove your hexproof source refunds you the life it deals, so an opponent trying to break through has to overcommit to kill a body that heals you for the privilege. Flying and vigilance keep it relevant on both sides of combat rather than parking it as a pure enchantment-on-legs. It sits in a narrow but real niche: a proactive answer to the targeted-you archetypes that plays as a creature rather than a permanent you have to protect separately, which means it dodges the enchantment-removal that hoses the Leyline plan while opening a new seam for creature removal to exploit.