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Elemental HERO Escuridao will mostly find use as being an extender summoned off the Miracle Fusion but with Super Polymerization you can use it to get rid of some cards like and opponent's Destroyer Phoenix Enforcer or Draco Berserker of the Tenyi

Omniscience_is_life says

Another cards-only expansion, the set adds another Herald, a new membership similar to the Silver Twilight Lodge, a new element called Corruption, and difficulty cards that allow the player to make the game optionally easier or harder

So long as The Ur-Dragon is in either one of these zones, your other Dragon spells cost one less generic mana to cast