Invasion of Tarkir // Defiant Thundermaw
A Dragon payoff that pays out before you cast a single Dragon: reveal your fatties as the Siege enters and the burst scales off your grip, so the same investment that seeds a Dragon deck can clear a blocker or point damage elsewhere. The "any other target" clause is the quiet restriction. Because the Siege cannot aim its own damage at itself, it has no self-firing route to flipping early; the transformed side stays gated behind combat. That gate is where the battle frame does its balancing work: a Siege enters under an opponent's protection, and the back-face reward comes only from actually breaking it down. Get there and Defiant Thundermaw turns every Dragon you control into a repeatable cannon, each attack pointing two damage wherever you need it, so a wide Dragon board converts to a spread of burst without further mana.
The real cleverness is how the two halves reward the same deckbuilding choice from opposite ends. Hoarding Dragons in hand feeds the front-face damage; deploying them onto the battlefield feeds the back-face attack triggers. A tribal deck naturally does both across a game, so a full grip becomes reach early and a full board becomes inevitability late, with the card finding relevance at either point on the curve. That span is why this reads less like a removal spell and more like the axis a Dragon deck is built around.
