Fangs of Rebellion: Dark Rebellion

At the beginning of the Duel, add 2 "The Phantom Knights of Shadow Veil" to your Deck and 1 "Dark Rebellion Xyz Dragon" to your Extra Deck. In addition, the following effect can be activated if the only monster you control is 1 "Dark Rebellion Xyz Dragon" and your opponent controls a monster with higher ATK. Select up to 2 cards in your hand and attach them to your "Dark Rebellion Xyz Dragon" as Xyz Materials. This Skill can only be used once per Duel.