Draconic Intervention

The board wipe that scales with your graveyard, and the additional cost is where the whole thing turns. You feed it an instant or sorcery from the yard, and the damage dealt to every non-Dragon creature equals that card's mana value: a graveyard full of expensive spells becomes a graveyard full of ammunition. That single line reframes what a spellslinger deck's cantrips, discard, and dead late-game bombs are actually worth. Then the exile-not-die clause changes the math entirely against a plain damage wrath: any creature that would die from the damage gets exiled instead, so recursion loops and death-triggers never fire, because the bodies never reach the graveyard to be reused. Note the limit of that trick, though: it is a replacement for dying, not a workaround for surviving. An indestructible creature simply shrugs off the damage and stays on the battlefield, and anything with toughness above your chosen X does the same. The Dragon exemption is doing double duty as flavor and as a build-around, pointing the card squarely at a board that is nothing but Dragons, where it reads as one-sided. And because the spell exiles itself on resolution, there is no rebuy: it is a single, decisive reset priced against how much stored value you were willing to spend to fire it. The tension the design resolves is that a scaling sweeper usually wants a cheap ceiling; this one hands you the dial and asks how much of your graveyard you will burn to swing the board.