A-to-Z-Dragon Buster Cannon [SDKS-EN040] Ultra Rare Fusion/Effect Monster it gains 500 ATK until

it gains 500 ATK until the end of this turn (even if this card leaves the field)

You can only activate 1 "Vampire Awakening" per turn

It does not have to activate its effects during the End Phase to shuffle itself into the Extra Deck

You can only use 1 "Witchcrafter Collaboration" effect per turn

and "Fusion Dragon" in their names)

A-to-Z-Dragon Buster Cannon [SDKS-EN040] Ultra Rare Fusion/Effect Monster it gains 500 ATK untilSet: Structure Deck: Seto Kaiba Card type: Fusion Effect Monster Rarity: Ultra Rare Attack: 4000 Defense: 4000 "ABC Dragon Buster" + "XYZ Dragon Cannon" Must be Special Summoned (from your Extra Deck) by banishing cards you control with the above original names, and cannot be Special Summoned by other ways. (You do not use "Polymerization".) During either player's turn, when your opponent activates a Spell Trap Card, or monster effect: You can discard