This card can only be Ritual Summoned with the Ritual Spell Card, "White Dragon Ritual". If this card attacks a face-down Defense Position monster, destroy the monster immediately with this card's effect without flipping it face-up or applying damage calculation. You can Tribute this card to Special Summon 1 "Blue-Eyes White Dragon" from your hand or your Deck. ("Blue-Eyes White Dragon" cannot attack during that turn.)