Celestial Kirin
The engine hinges on a coincidence the deck has to manufacture: every cast of a qualifying spell destroys every permanent sharing that spell's mana value, friend and foe alike. The symmetry is the deckbuilding puzzle. Cast a four-mana trigger and you obliterate every permanent that costs four, this body included, since its own fixes its mana value at four no matter what cost reducers you stack on the spell that pulls the trigger. The trick is that you pick the number you fire by choosing what you cast, so a player who knows their own curve can aim a one-sided sweeper by playing around it: keep your real threats off the doomed cost, then fire on a value your opponent has overcommitted to. It is a board wipe wearing the costume of a tribal payoff, and it rewards a tightly curated mana-value spread rather than a pile of efficient cards. The requirement that the trigger come from a narrow spellcraft shell chains the card to a specific supporting cast, which is why it never escaped its niche: the cards that make the destruction asymmetric are few, and a flying 3/3 does little to carry the card when the engine misfires. As an expression of asymmetric symmetry, though, it remains one of the cleaner statements of the idea that you can hand both players the same effect and still win the exchange on information alone.
