Aurora Eidolon

A targeted damage shield bolted to a recursion engine, built for a strategy whose whole identity was casting multicolored spells. The activated ability is a one-shot: pay white, sacrifice the body, and prevent the next three damage to any target. It reads small until the second clause turns it into a renewable resource. Sacrificing the Spirit does not waste it; it routes the card straight into the graveyard, exactly the zone the recursion clause needs it in. From there, every gold spell you cast offers it back to your hand, so the prevention stops being a single use and becomes a recurring tax on whatever is trying to race you. That makes this a creature designed to die and return rather than stick around: a fragile 2/2 whose value lives in the loop, not in combat. As pure damage prevention it is modest, blunting a burn spell or a midsize attacker once. The cadence is what matters. Each gold spell buys another activation back, asking a controlling or value-oriented shell to keep recycling it turn after turn, trading the body again and again for a steady drip of insurance. The two halves are tuned to one motion: spend the shield, refuel it on the next multicolored spell, repeat. It only functions inside a deck already committed to gold-heavy spell density, which is precisely why the recursion clause keys off multicolored casts rather than any spell at all.