Take control of an opponent's monster with a card like "Mind Control". Then, use this card's effect to change it to the Dragon-Type. Banish the opponent's monster to Special Summon "Red-Eyes Darkness Metal Dragon".
Or use "A Wingbeat of Giant Dragon", if it's a Level 5 or higher monster, to return it back to your opponent's hand and destroy all Spell/Trap cards on the field. This combo works better if the monster you take control of is a Fusion or Synchro monster, so your opponent will have to Special Summon it from the Extra Deck again.