Cannot be Normal Summoned Set. Must first be Special Summoned with Max Metalmorph that was activated by Tributing a Level 5 or higher Dragon monster. You can reveal this card in your hand; Set 1 Metalmorph Trap from your Deck, and if you do, shuffle this card into the Deck. When your opponent activates a card or effect (Quick Effect): You can negate the activation, then you can inflict damage to your opponent equal to the original ATK of 1 Attack Position monster your opponent controls. You can only use each effect of Red-Eyes Black Fullmetal Dragon once per turn.