It would seem weird for Dark Blade to be Special Summoning himself, so maybe make it only Special Summon the Dragons, or something like this: "If this card inflicts Battle Damage to your opponent, you can equip 1 "Pitch-Dark Dragon" or "Kiryu" from your hand, Deck or Graveyard to a "Dark Blade" you control"
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Creatures you begin to control later in the turn and noncreature permanents that become creatures later in the turn won't get hexproof or indestructible
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This Energy is then discarded as a result, of course, because this wouldn't be a Fire-type deck without an Energy-discarding caveat to keep in mind