If you're Tributing a "Phantom Beast" monster or "Gazelle the King of Mythical Beasts", this card can be Normal Summoned with 1 Tribute. When this card destroys a monster by battle, inflict 500 damage to your opponent. When this card is destroyed and sent to the Graveyard by an opponent's card effect, inflict 2000 damage to your opponent.
Because of the Phantom Beast Cross-Wing's in the graveyard. According to it effect: "While this card is in the Graveyard, "Gazelle the King of Mythical Beasts" and all "Phantom Beast" monsters on the field gain 300 ATK." So, if there are 3 in the graveyard, all Gazzzele and Phantom Beasts gain 900 attack!