Xyz Darkraze

You can use this Skill if your Extra Deck contains a DARK Xyz Monster. 1: At the beginning of the Duel, gain 1500 LP. 2: Once per turn, during your Main Phase, make 1 face-up monster you control gain 300 ATK until the end of this turn. It gains an additional 500 ATK until the end of this turn if there is a DARK Xyz Monster and/or a DARK monster and an Xyz Monster on your field and/or in your Graveyard.