During the Main Phase: Fusion Summon 1 Fusion Monster from your Extra Deck that mentions Blue-Eyes White Dragon or Blue-Eyes Ultimate Dragon as material, by shuffling the Fusion Materials listed on it from your hand, field, and or GY into the Deck, then, you can destroy face-up cards your opponent controls, up to the number of Blue-Eyes White Dragon and Blue-Eyes Ultimate Dragon used from the field as material. You can only activate 1 Ultimate Fusion per turn.