Medicine Bag

A repeatable regeneration source priced entirely in card disadvantage. Where most regeneration effects of its era stapled the shield to a creature or a one-shot spell, this puts it on a colorless artifact and meters every use against your hand: a mana, a tap, and a card off the top of your grip per shield. That trade is the whole design. Regeneration is cheap to provide and brutal in a long fight, so the cost of admission here is not mana but attrition, the same lever that keeps other discard-fueled engines honest. The colorless framing is the other half of the idea: it offers regeneration to decks that have no native access to it, white and red and blue creatures suddenly able to walk into combat or a sweeper and come back. The tap requirement also caps the protection at one creature per turn, so it shields a single key threat rather than blanking a board wipe outright. It is a slow, grinding piece of defense built for the grind, the kind of artifact that rewards a hand full of redundant cards rather than a tight curve, and it asks you to value the creature on the battlefield more than the cards you are feeding into the mouth of the bag.