Utvara Hellkite

The math is exponential the moment it gets going. The trigger fires on any Dragon you control attacking, and the tokens it makes are themselves Dragons, so a single combat step compounds: every flier swinging adds another 6/6 to the board, and each of those swings next turn to make more. Crucially, the engine bootstraps itself: a lone Hellkite attacking triggers off its own attack, so even with no other Dragons in play it spawns a 6/6 token every swing, and the snowball begins from one card. What balances an effect this lopsided is the eight mana and the requirement that the creatures actually declare as attackers: the army it builds is committed to combat, not held back, so the controller is racing rather than grinding. That makes it a top-end payoff rather than a value piece, a finisher a Dragon-tribal deck builds toward as the turn that ends the game, not one that ekes out incremental advantage. Among the many big-bodied flying finishers red has printed, this one is distinguished by treating its tribe as a runaway resource: it converts every attack trigger into another attack trigger, manufacturing the very Dragons that fuel it. In a board already populated with fliers the doubling outpaces almost anything trying to stabilize against it, and even from a standing start it builds its own supply line one combat at a time.