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This makes it cost effective to print entire decks or cubes

having one that fills a different role broadens the archetype

You can get land with Eternal Dragon (and also have self-recursion with it as well), more discard with Ebon Dragon, tutor for things with Hoarding Dragon or Imperial Hellkite, sweeping with Steel Hellkite or Thunder Dragon or Scourge of Kher Ridges, take extra combat steps with Hellkite Charger, destroy artifacts with Hoard-Smelter Dragon, draw cards with Knollspine Dragon or Niv-Mizzet, lock creatures down with Rimescale Dragon, or combo out with Worldgorger Dragon

For example, if a blue Sliver enters the battlefield under your control, the ability can target and exile a creature with protection from white

And if you check out some streamers like Covert Go Blue, who despises mono-red and even sings some songs against the archetype while streaming Magic videos, you probably learned to hate, despise, or at least respect the archetype