Card Rulings:Dark Armed, the Dragon of Annihilation

OCG Rulings

 * The effect of "Dark Armed, the Annihilation Dragon" cannot be activated unless you are able to destroy 1 card on your opponent’s field and banish 1 card from your Graveyard, meaning you cannot activate it if you have no cards in your Graveyard. (You cannot detach an Xyz Material to activate the effect.)