Asceticism

Green's answer to the question of how to protect a board that has already gotten ahead. Where blue counters threats before they resolve and white blinks creatures out of a removal spell's path, this sits on the battlefield and changes the rules underneath the whole team: a static hexproof umbrella that walls off targeted removal, opposing auras, and any fight effect an opponent points at your creatures. The activated regeneration shield is the part that earns the five-mana price. Hexproof stops anything that targets, but it does nothing against a board wipe that destroys without targeting or against trample-and-block math that piles lethal damage on a single creature; the regenerate clause patches exactly that hole. For two mana a turn it buys back a creature that combat or a generic destroy effect would otherwise put in the graveyard. Read together, the two halves cover most of the ways green's threats die, and the activated cost is the discipline that keeps the protection from being free: you shield one creature per activation, not the whole board at once. The vulnerability the design accepts is its own type line. An enchantment that grants hexproof cannot grant hexproof to itself, so the cleanest answer is to ignore the creatures entirely and remove the enchantment. It protects everything except the thing doing the protecting.