Molting Skin

Regeneration usually rides on a creature's body or a one-shot instant; here it lives on a permanent that buys back its own protection. Bounce the enchantment to regenerate, replay it, regenerate again: the shield is reusable as long as you can keep paying three mana to recast it. That recursion is the whole trick, and also the catch. Every regeneration costs a card slot's worth of tempo and a full recast, so the protection is durable but slow, the opposite of the cheap fog-against-removal that instant-speed regeneration spells offer. It favors keeping the same creature alive across many turns rather than weathering a single board wipe, and it dodges graveyard hate on the regeneration source itself: the answer is never in the bin, it is sitting in hand waiting to be deployed again. As a design it sits in green's long tradition of stubborn, attrition-flavored resilience, the color that keeps its threats on the table rather than rebuilding them. The slowness is the honest tax for an effect that, on a permanent, could otherwise lock a creature out of removal forever.